CycleOps PowerTap User Manual

OWNER’S MANUAL  
PowerTap SL2.4  
About This Manual  
Thank you for your purchase of the CycleOps PowerTap SL2.4. PowerTap technology is the  
ultimate measure of performance by providing real-time feedback on your training intensity.  
No other equipment will give you greater performance return on your investment.  
This manual describes the proper use and maintenance of the PowerTap SL2.4. Every person,  
independent of skill level, should read at least PRECAUSTION: IMPORTANT prior to use of the  
PowerTap.  
DEFINITIONS  
Bold Letters - Bring special attention to important points and that should be read and under-  
stood prior to using the PowerTap.  
Italicized Letters - Indicate reference to another section of the manual where further explana-  
tions are found.  
This manual describes the functions of the PowerTap SL2.4 and the information provided may  
not apply to all PowerTap models. For the most current owners manual available please consult  
3
Table of Contents  
Computer Setup.....23  
Computer Setup Main Menu.....23  
About this Manual  
Precautions: Important.....5  
System Overview.....7  
Computer Setup 1.....24  
Computer Setup 2.....27  
Computer Setup 3.....28  
Computer Setup 4.....29  
Computer Setup 5.....  
Maintenance & Specifications.....31  
Bearings.....31  
The PowerTap System.....7  
Preparing for Installation.....7  
Compatibility.....8  
Wheel Building.....8  
System Installation.....9  
General Computer Operation.....12  
Display Levels.....12  
Freehub.....31  
Freehub Replacement.....31  
Computer Batteries.....33  
Technical Specifications.....33  
Range of Measurement.....33  
Hub Batteries.....34  
Display Modes.....12  
Finding Sensors  
Clearing Data  
Buttons.....12  
Power Conservation.....13  
Computer Navigation.....14  
Power Function.....14  
Torque Function.....15  
Zero Torque.....15  
Battery Replacement.....34  
Test Mode.....35  
Trouble Shooting.....37  
Glossary.....39  
Speed Function.....16  
Multi-Function.....17  
Cycle Computer Mode.....18  
Heart Rate Monitor Mode.....20  
Interval Mode.....21  
Interval Memory Mode.....22  
4
Precautions: Important  
Before beginning any exercise program, consult your physician.  
Keep your eyes on the road. Do not become overly engaged with the PowerTap display.  
We recommend familiarizing yourself with computer functions while stationary.  
The computer, receiver, and hub are water resistant, not water proof. Avoid sustained water  
contact and do not deliberately place the PowerTap or its components in water or under high-  
pressure sprays. Therefore caution should be used when riding in rain. Following such rides,  
special precautions should be taken including removing the PowerTap plastic twist cap and  
allowing the hub to air dry.  
Wash off dirt with a cloth soaked in a weak mixture of neutral detergent and water and wipe  
excess water off with a dry cloth Avoid spraying the unit directly with solvent mixture. Do not  
use thinner or other solvents to clean parts as they may dissolve the plastic console casings.  
If you are not familiar with bike maintenance please contact a professional bicycle mechanic  
before servicing. The power measuring components of the PowerTap are highly complex and  
should only be serviced by Saris Cycling Group.  
The plastic cover on the hub should be removed only when replacing batteries or when  
allowing the unit to dry after submersion in water. Repeated disassembly may compromise the  
effectiveness of the O-ring seals. O-rings should be inspected and replaced if necessary when  
ever the battery cover is removed. Use a light coating of grease when reinstalling the battery  
cap on the O-rings.  
During the course of repair do not remove the torque tube. There are no serviceable parts  
inside. Special tools are required for reassembly and calibration. If problems are suspected  
contact Saris Cycling Group directly at 800-783-7257 (001 608 274 6550).  
5
Precautions: Important, cont.  
The PowerTap wheel does not include a quick release skewer. CycleOps recommends using a  
steel skewer.  
Both sides of the PowerTap should be built using a 3x spoke lacing pattern. Because of the  
design of the PowerTap, torque is transmitted through the hub to the non-drive side. For  
additional questions please consult WHEEL BUILDING.  
Failure to adhere to these precautions may cause premature failure or incorrect operation of  
the unit and may void the warranty. Please register your PowerTap at www.cycleops.com.  
6
System Overview  
THE POWER TAP SYSTEM  
The PowerTap system includes a power-measuring hub which measures torque and wheel  
speed.This information is transmitted to a computer mounted on the handlebar or stem. Heart  
rate data is transferred via A coded telemetry signal from the chest strap monitor. The data is  
then integrated to display current, average, and maximum biometric information.  
PREPARING FOR INSTALLATION  
The PowerTap SL2.4 hub comes either alone or in a pre-built wheel. If purchased alone, the hub  
must be built into a complete wheel prior to use. Other items necessary for installation and not  
provided include a cassette, spoke protector, reflectors, skewer, rim strip, tire, and tube (clincher  
rim) or glue and tubular tire (tubular rim). See TABLE 1 to verify package contents.  
TABLE 1  
Package Contents  
Qty  
1
1
Item  
PowerTap hub (or built wheel)  
PowerTap computer  
Chest strap  
1
4
12  
1
1
1
Foam mounting tapes  
Cable ties  
Training With Power guide  
PowerTuned Agent CD  
Link USB Cable  
1
Extra CPU Battery  
7
System Overview cont.  
COMPATABILITY  
The PowerTap SL2.4 hub is compatible with Shimano 8, 9, and 10 speed systems or Campagnolo  
8, 9, and 10 speed systems. Freehub bodies may be interchanged. Reference FREEHUB  
REPLACEMENT for further instructions.  
The PowerTap is available in 130mm and 135mm axle lengths. Only insert the correctly spaced  
PowerTap hub into your frame. For example, only use a 130mm-spaced hub in a 130mm road  
frame. Do not force the hub into any frame. Doing so may cause failure of the frame, hub, or both,  
and will void the warranty. Contact your dealer or Saris Cycling Group to address any special  
compatibility concerns.  
WHEEL BUILDING  
Contact a wheel building professional or dealer for assistance in building the PowerTap SL2.4  
wheel if not purchased as a complete wheel. Both sides of the PowerTap should be built using  
only a 3x spoke lacing pattern. Due to the design of the hub, the load pattern is not the same as  
a conventional hub. Slotting the hub flanges to accommodate bladed spokes is not recommend-  
ed and will void the warranty. Complete wheel building hub dimensions are listed in TABLE 2.  
Reference a spoke-length calculator to determine proper spoke length.  
TABLE 2 - Wheel Building Dimensions  
Measurements  
Drive  
Non-Drive  
Hub Center To  
Flange  
17.4mm  
70mm  
31.7mm  
70mm  
Flange Diameter  
Spoke Hole Diameter: 2.5  
8
System Overview cont.  
SYSTEM INSTALLATION  
1. Insert Wheel Into Frame  
Insert the PowerTap SL2.4 wheel into the frame. Make sure the  
axel is correctly positioned in the dropouts and secure the  
wheel in place with a steel skewer.  
2. Attach Computer Shoe to Handlebar or Stem  
The shoe can be mounted on either the handlebar or stem. Secure the receiver shoe with cable  
ties. Slide the receiver shoe in the direction of the arrow as depicted in either FIGURE 2A or 2B  
depending on mounting location.  
2A. Attach Receiver mount to Handlebar  
2B. Attach Receiver mount to Stem  
Slide shoe in direction of arrow onto the base.  
Slide shoe in direction of arrow onto the base.  
Receiver Shoe  
Receiver Shoe  
Arrow  
Arrow  
Mounting Base  
Mounting Base  
9
3. Place Computer into Shoe  
FIGURE 5  
Place the computer into the mounting shoe on the handlebar or stem.  
Line up the slots on the base of the computer with the bracket and slide  
computer toward the rider (FIGURE 5). NOTE: Ensure the computer is fully  
inserted onto the receiver shoe for proper data transmission.  
4 Heart Rate Monitor Strap  
Position the heart rate monitor strap on your torso as pictured in FIG-  
FIGURE 6  
URE 6. The strap should rest just beneath the pectoralis muscles of  
the chest. For best results slightly moisten the electrodes where con-  
tact is made with skin. The heart rate strap must be worn to enable  
the heart rate function. NOTE:The chest strap for the PowerTap SL2.4  
uses a coded frequency and is not compatible with other manufactur-  
ers chest straps.  
FIGURE 7  
5. Verify Installation  
Check to make sure all components are properly secured. Spin the  
rear wheel and verify that in the upper left hand corner of the com-  
puter the transmission icon illuminates (FIGURE 7). This indicates  
the hub is properly transmitting a signal to the receiver and com-  
puter. If the transmission icon is not illuminated consult Finding  
Section Sensors for further instructions.  
10  
General Computer Operation  
DISPLAY LEVELS  
The computer has three (3) main display levels:  
TRANS.  
ICON  
POWER  
DISPLAY  
365  
Top  
Power  
WATTS3  
25  
2.4  
Middle  
Bottom  
Speed  
Multi-Function  
SPEED  
DISPLAY  
INTERVAL  
DISPLAY  
MI  
MULTI  
DISPLAY  
58.I0  
D
NOTE:These locations only apply to trip and  
interval modes and does not apply to Cycle Computer  
or Heart Rate Monitor Function. See COMPUTER SETUP 4  
to customize display options.  
DISPLAY MODES  
MODE (LEFT)  
Changes active  
mode  
The computer has two (2) main modes of operation:  
BOTH  
Clear data  
Enter setup  
SELECT (RIGHT)  
Select function  
1) Trip  
2) Interval  
Hold [MODE] to toggle between display modes.  
BUTTONS  
There are two (2) buttons on the computer:  
1) [Mode]  
2) [Select]  
NOTE: [BRACKETED] words indicate buttons.  
There are five (5) types of button presses:  
1) Press [MODE] or [SELECT] - a single press and release of either [MODE] or [SELECT].  
Used for entering different modes and functionality.  
11  
2) Hold [MODE] or [SELECT] - a single button press and hold of either [MODE] or  
[SELECT] for 2 sec. Used for initiating a new Interval.  
3) Press [MODE] and [SELECT] - simultaneously press and release of both [MODE] and  
[SELECT].  
4) Hold [MODE] and [SELECT] - simultaneously press and hold both [MODE] and  
[SELECT] for 2 sec. NOTE: Continuing to hold longer than 2 sec. and releasing will clear  
all data.  
5) Extended Hold [MODE] and [SELECT] - simultaneously press and hold of both  
[MODE] and [SELECT] for greater than 5 sec. Used for initiating scrolling menu.  
SCROLLING MENU:  
SCROLLING MENU:  
Find: If [MODE] and [SELECT] are released  
When Find” is displayed the computer will find  
Search for the PowerTap hub.  
clr: If [MODE] and [SELECT] are released when  
clr is displayed ALL DATA WILL BE ERASED  
.
SEt: If [MODE] and [SELECT] are released  
When SEt is displayed on the top level of the  
Screen, a flashing E”, d and t on the middle  
Level and 12345 on the bottom level.  
E = exit, return to ride mode  
d = restore default settings  
T = test mode  
1 2 3 4 = setup menus  
POWER CONSERVATION  
The computer and hub have power saving features to prolong battery life.The computer powers  
down the display after four (4) minutes of inactivity. Press either [MODE] or [SELECT] to activate  
the display. Similarly, the hub powers down after five (5) minutes of inactivity. The transmission  
icon will not be visible when the hub is asleep.To wake the hub spin the wheel and verify the  
transmission icon is illuminated.  
12  
Computer Navigation  
POWER FUNCTION  
The top level of the main display shows current, max, and average power readings.  
1) Press [MODE] to scroll the cursor to the top line of the main display  
2) Press [SELECT] to toggle through the power function options.  
For accurate power readings it is important to frequently zero the torque, see ZERO TORQUE.  
FIGURE 9  
Current Power  
Power is displayed in watts from 0-1999 in 1 watt increments. Current power  
365  
WATTS3  
25  
readings are displayed only when the word “WATTSappears below the top line  
(FIGURE 9). NOTE: IfWATTSdoes not appear under the top line the computer is  
in the Cycle Computer Function. To return to power readings see CYCLE  
COMPUTER MODE.  
MI  
58.I0  
D
FIGURE 10  
Maximum Power  
Both WATTSand MXdisplayed simultaneously indicate the highest recorded  
power output since the last time the data was cleared in trip mode or the selected  
interval in interval mode. (FIGURE 10)  
849  
MX  
WATTS  
3
25  
MI  
58.I0  
D
Average Power  
FIGURE 11  
Both WATTSand AVGdisplayed simultaneously indicate the average power  
output since the last time the data was cleared in trip mode or the selected  
interval in interval mode. (FIGURE 11)  
I95  
AV WATT3S  
25  
MI  
58.I0  
D
13  
TORQUE FUNCTION  
FIGURE 12  
Shows the torque placed on the hub in inch-pounds. To display torque  
in trip mode:  
000  
25 3  
MI  
1) Press [MODE] to scroll the cursor to the top line of the main display.  
2) Press [SELECT] until the current power function is displayed.  
58.I0  
D
3) Hold [SELECT] until the word WATTSbegins to flash. A blinking “WATTSdisplay indicates  
the torque function is currently displayed.  
4) Press [SELECT] to return to the current power function. (FIGURE 12).  
IMPORTANT: ZERO TORQUE  
Frequently the torque must be zeroed to ensure the most accurate power  
information is displayed. If the current power display is positive or  
negative while coasting the torque must be zeroed. This operations must  
be done while coasting with no tension on the chain, no tension placed on  
the pedals, and the transmission icon must be illuminated. To zero torque:  
1) Press [MODE] to scroll the cursor to the top line of the main display.  
2) Press [SELECT] until current power function is displayed.  
3) Hold [SELECT] until the word “WATTS” begins to flash to enter the  
torque function.  
4) Hold [SELECT] again until “0” is shown.  
5) Press [SELECT] to return to current power. The current power function  
will now read zero while coasting.  
14  
SPEED FUNCTION  
The middle level of the main display shows current, max, and average speed readings.  
1) Press [MODE] to scroll the cursor to the middle line of the main display.  
2) Press [SELECT] to toggle through the speed function options.  
FIGURE 13  
Current Speed  
365  
WATTS3  
25  
Speed is displayed in either miles per hour (MI) or kilometers per hour (KM) up to  
99.9 mi/hr or km/hr in 0.1 mi/hr or km/hr increments. Current speed readings are  
displayed when onlyMIorKMappears below the middle line. (FIGURE 13)  
MI  
58.I0  
D
FIGURE 14  
Maximum Speed  
EitherMIorKMand MXdisplayed simultaneously indicate the highest record-  
ed speed since the last time data was cleared in trip mode or the selected interval  
in interval mode. (FIGURE 14)  
365  
58M.II0  
WATT7S  
33  
MX  
D
Average Power  
EitherMIorKMand AVGdisplayed simultaneously indicate the average  
recorded speed since the last time data was cleared in trip mode or the selected  
interval in interval mode. (FIGURE 15)  
FIGURE 15  
365  
WATTS  
3
MI  
20  
AV  
58.I0  
D
15  
MULTI-FUNCTION DISPLAY  
FIGURE 16  
Distance (D)  
365  
Total trip or the selected interval distance in interval mode is displayed in miles or  
kilometers from 0.00 to 999.99 (FIGURE 16).  
WATTS3  
25  
MI  
1) Press [MODE] to scroll the cursor to the bottom line of the main display.  
58.I0  
D
2) Press [SELECT] to toggle through the multi-function displays until the Dicon is displayed.  
NOTE: Distance is displayed in the same units as speed.  
Trip Time and Time of Day (T)  
Total trip time, interval time, and time of day is displayed to 9:59:59 (FIGURE 17).  
FIGURE 17  
365  
1) Press [MODE] to scroll the cursor to the bottom line of the main display.  
WATTS  
3
25  
2) Press [SELECT] to toggle through the multi-function displays until the “Ticon is  
displayed.  
MI  
2.5 I.43  
T
3) While in trip time hold [SLECET] to access the real time clock.  
4) Hold [SELECT] to return to trip or interval time.  
NOTE: Auto start and stop with rotation of the wheel is the default setting.To customize auto  
start and stop see COMPUTER STETUP 4.  
Cadence (C)  
FIGURE 18  
Cadence is measured at the hub by analyzing the way a rider applies torque  
through the pedal stroke since there are natural power differences in the pedal  
stroke. The rate of pedaling is shown from 20 to 240 RPM.  
365  
WATTS3  
25  
MI  
NOTE: An optional wireless cadence sensor is available to measure cadence at  
the crank.  
89  
C
1) Press [MODE] to scroll the cursor to the bottom line of the main display.  
2) Press [SELECT] to toggle through the multi-function displays until the "C" icon is displayed.  
(FIGURE 18)  
CYCLE COMPUTER MODE  
Access to the Cycle Computer Mode is also gained in the cadence function.This fun-  
tion allows the PowerTap SL2.4 computer to function as a cycle computer in the  
absence of the PowerTap hub.This function is useful when the PowerTap SL2.4 hub is  
not present such as in racing situations where lighter racing wheels are used. NOTE: In  
Cycle Computer Mode heart rate is displayed in the top line of the main display and  
power data is no longer displayed.To enter Cycle Computer Mode:  
1) Press [MODE] to scroll the cursor to the bottom line of the main display.  
2) Press [SELECT] to toggle through the mult-function displays until the Cicon is dis-  
played.  
3) Hold [SELECT] and the word WATTSwill disappear from below the top line. Place  
magnet or rear wheel so it passes the receiver at the line or the sensor.  
4) To return to current power function hold [SELECT] until the word WATTSis dis-  
played under the top line of the main display.  
17  
Average Cadence (C & AVG)  
FIGURE 19  
The average cadence displays data since the last time data was cleared in trip  
mode or the selected interval in interval mode. Average cadence is displayed in  
RPM.  
365  
WATTS  
3
25  
MI  
1) Press [MODE] to scroll the cursor to the bottom line of the main display.  
76  
C
AV  
2) Press [SELECT] to toggle through the multi-function displays until the C” and  
“AVGis displayed. (FIGURE 19)  
Energy Expenditure (E)  
FIGURE 20  
The total work done over the course of the trip or interval is shown in kilojoules.  
This value is a measure of the total energy expended over the course of your ride.  
This is roughly equivalent to dietary calories expended.  
365  
WATTS  
3
25  
MI  
1) Press [MODE] to scroll the cursor to the bottom line of the main display.  
2E009  
2) Press [SELECT] to toggle through the multi-function displays until the Eis dis-  
played. (FIGURE 20)  
Odometer (O)  
FIGURE 21  
Total accumulated distance traveled since the last system reset is displayed in  
miles or kilometers. To manually input the your odometer reading see COMPUTER  
SETUP 1.  
365  
WATTS3  
25  
MI  
1) Press [MODE] to scroll the cursor to the bottom line of the main display.  
2584  
O
2) Press [SELECT] to toggle through the multi-function displays until the O”  
is displayed. (FIGURE 21)  
18  
Heart Rate (  
)
FIGURE 22  
Current heart rate is shown up to 255 beats per minute (BMP). You must wear the  
heart rate chest strap to enable the heart rate measurement function. NOTE:The  
PowerTap SL2.4 uses a coded chest strap.  
365  
WATTS  
3
25  
MI  
1) Press [MODE] to scroll the cursor to the bottom line of the main display.  
I72  
2) Press [SELECT] to toggle through the multi-function displays until the “ ”is  
displayed. (FIGURE 22)  
HEART RATE MONITOR MODE  
Access to the Heart Rate Monitor Mode is also gained in the current heart  
rate mode. This function allows the PowerTap computer to function as a  
heart rate monitor in the absence of the PowerTap hub. NOTE: In Heart  
Rate Monitor Mode heart rate is displayed on the top line of the main  
display and power data is no longer displayed.  
1) Press [MODE] to scroll the cursor to the bottom line of the main display.  
2) Press [SELECT] to toggle through the multi-function displays until the  
(
) icon is displayed.  
3) Hold [SELECT] and the words “watts” disappears from below the top  
line.  
4)To return normal PowerTap functions hold [SELECT] until the word  
“WATTS” is displayed under the top line of the main display.  
19  
Average Heart Rate ( AV)  
FIGURE 23  
This value is a running average of the heart rate in BPM. If there is no heart rate  
information this will display as 0.  
365  
WATTS  
3
1) Press [MODE] to scroll the cursor to the bottom line of the main display.  
25  
MI  
2) Press [SELECT] to toggle through the multi-function displays until the “ AVis  
displayed. (FIGURE 23)  
152  
AV  
INTERVAL MODE  
FIGURE 24  
The computer has two display modes. The trip mode shows total trip met-  
rics, and the interval mode displays interval specific information.The inter-  
val mode functions as a lap marker and is essentially always on.  
watts  
multi  
int  
speed  
To begin the first interval, or advance to the next interval:  
Press and release [MODE] and [SELECT] simultaneously. NOTE: Do not hold  
both buttons down as you will clear all data from the computer.  
In trip mode INT” and the new interval number will appear and disappear  
(FIGURE 24). The computer can mark an unlimited number of intervals  
although after nine (9) the marker will begin to count back at one (1). For  
example, interval ten (10) is displayed following interval (9) as one (1).  
To view interval specific data (power, speed, and multi-function display) from any location on the  
display:  
1) Hold [MODE] untilINTappears on the left hand side of the display. The INTand interval  
number will remain illumined as a forth line in the main display (FIGURE 24). The data displayed  
is that of the current interval number shown.  
2)To exit back out of interval mode hold [MODE] untilINTdisappears.  
20  
INTERVAL MEMORY MODE  
To access stored interval data for the previous 9 intervals only:  
1) Enter the interval mode hold [MODE] untilINTappears on the left hand side of the display.  
2) Press [MODE] to scroll until the INTflashes. NOTE: INT now constitutes a fourth level of dis-  
play.  
3) Hold [SELECT] and the memory icon (”M”) appears next to the interval number (FIGURE 25).  
4) With INTflashing, press [SELECT] to advance to the interval you wish to view.  
5) Press [MODE] scroll the cursor to the line of information you wish to view. NOTE: Recovery  
periods as well as work periods are displayed in memory mode.  
To exit back out of the interval memory mode hold [SELECT] until the memory icon disappears.  
The computer is now displayed in the interval mode. To exit from the interval mode from any  
location on the display hold [MODE] untilINTdisappears.  
FIGURE 25  
watts  
int m  
speed  
multi  
21  
Computer Setup  
The setup feature has four (4) main modes. You do not have to complete all four to change set-  
tings. Please reference each mode to determine the correct location to begin. NOTE: The com-  
puter illustrations for each mode display the factory default settings.  
FIGURE 26  
COMPUTER SETUP MAIN MENU  
1) Press either [MODE] or [SELECT] to activate the computer.  
NOTE:The version of firmware is displayed upon startup. The most  
Set  
26)  
1 2 3 4 5  
2) Extended hold of [MODE] and [SELECT] simultaneously enters com-  
puter setup function indicates by a flashing E. NOTE: Continue to hold  
through clear all”screen. Releasing hold early will clear all current data.  
3) The setup mode displays three (3) letters and numbers 1-4. Each letter represents a setup  
menu. A flashing alphanumeric character indicated current selection. (FIGURE 27)  
E = exit, return to ride mode  
d = restore default settings  
T = test mode  
FIGURE 27  
1 2 3 4 5= setup menus  
4) Press [SELECT] to scroll to the desired setup mode.  
5) Press [MODE] to begin setup.  
Set  
dt  
E
1 2 3 4 5  
22  
COMPUTER SETUP 1  
This setup menu includes: time of day, date, storage rate, wheel circumference, units of measure,  
odometer. NOTE:You are unable to move back to a previously viewed settings. You must restart  
setup 1 to make corrections. You may hold [MODE] and [SELECT] to save and exit setup.  
Set  
dt  
1) From the computer setup main menu press [SELECT] and scroll until the  
number one (1) is flashing. Press [MODE] to enter setup mode.  
E
1 2 3 4  
2) Press [SELECT] to toggle between a 12 or 24 hour clock. Press [MODE] to  
save.  
Std  
12  
t
Std  
p
3) Press [SELECT] to toggle between AM (A) or PM (P). Press [MODE] to  
save.  
t
4) Press [SELECT] to toggle through digit values to set hours in time of day.  
Press [MODE] to save.  
Std  
p
12:00  
t
23  
5) Press [SELECT] to toggle through digit values to set minutes in time of  
day. Press [MODE] to save.  
Year  
Std  
03  
6) Press [SELECT] to toggle through digit values to set year, month, and  
date. Press [MODE] to save.  
0
1
-
0
1
c
Month  
Day  
7) Press [SELECT] to toggle through storage rate values (1, 2 seconds).  
Press [MODE] to save. NOTE: Different storage rates yield different amounts  
of total storage time. Changes to the storage rate does not effect display  
information. Refer to TABLE 3 for appropriate storage rate.  
Std  
r
ec  
1
TABLE 3 - PowerTap SL2.4 Storage Rate  
Recording Rate (sec)  
1
2
Max Recording Time (hrs)  
15  
30  
8) Press [SELECT] to toggle through digit values to set the wheel circumfer-  
ence. Press [MODE] to save. Refer to TABLE 4 for common tire information.  
NOTE: For the most accurate reading perform a roll out measurement  
(mm) of the rear wheel.  
Std  
r
1
CI  
2096  
24  
TABLE 4 - Common Wheel Circumferences  
Tire Size  
Circ. (mm)  
Tire Size  
Circ (mm)  
24 x 1  
1753  
1913  
1953  
1986  
2055  
2070  
2125  
2139  
27 x 1 1/4  
700C Tubular  
700 x 20C  
700 x 23C  
700 x 25C  
700 x 28C  
700 x 32C  
700 x 38C  
2152  
2094  
2084  
2096  
2108  
2116  
2136  
2170  
26 x 1  
26 x 1.25  
26 x 1.5  
26 x 2.0  
26 x 2.125  
27 x 1  
27 x 1 1/8  
Std  
9) Press [SELECT] to toggle between English or Metric units.  
Press [MODE] to save.  
1
mi  
Std  
o
OD  
1
10) Press [SELECT] to set starting odometer reading. Press [MODE] to save.  
NOTE: Odometer settings are saved during battery changes.  
0 0 0 0 0  
25  
COMPUTER SETUP 2  
This setup menu includes: rate of display for watts, speed, and cadence. NOTE:You are unable to  
move back to a previously viewed settings. You must restart setup 2 to make corrections. NOTE:  
These settings do not effect the data stored for download.  
This function can be used to allow better pacing during time trial efforts. A greater rate of dis-  
play allows for a slower update of the display.  
Set  
dt  
1) From the computer setup main menu press [SELECT] and scroll until the  
number two (2) is flashing and press [MODE] to enter setup mode.  
E
1 2 3 4  
PRO  
AV WATTS  
2) Press [SELECT] to toggle through (1, 2, 3, 5 10, 30) rate of display values in  
seconds for watts. Press [MODE] to save.  
2
2
2
PRO  
3
3) Press [SELECT] to toggle between (1, 2, 3, 5 10, 30) rate of display values  
in seconds for speed. Press [MODE] to save.  
AV  
MI  
PRO  
5
4) Press [SELECT] to toggle between (1, 2, 3, 5 10, 30) rate of display values  
in seconds for cadence. Press [MODE] to save.  
2
C
AV  
6) Press [SELECT] then [MODE] to reset default settings. Press [MODE] to  
save changes.  
26  
COMPUTER SETUP 3  
This setup menu includes: zero readings for power, speed, and cadence. NOTE:You are unable to  
move back to a previously viewed setting. You must restart setup 3 to make corrections. NOTE:  
These settings are useful for determining you average when pedaling only and do not effect the  
data that is stored for download.  
PRO  
0’s  
1) Press [SELECT] to toggle between yes and no for zeros included in aver-  
age of watts. Press [MODE] to save.  
AV WATTS  
3
YES  
2) Press [SELECT] to toggle between yes and no for zeros included in aver-  
age of speed. Press [MODE] to save.  
PRO  
0’s  
AV MI  
YES  
3) Press [SELECT] to toggle between yes and no for zeros included in aver-  
age of cadence. Press [MODE] to save.  
PRO  
0’s  
3
YES  
c
av  
4) Press [SELECT] to toggle between yes and no for auto-zero function.  
Normally leave at yes. NOTE: Auto-zero is used for track bike use where  
large negative torque may be present. Hub modification to fixed hear is  
necessary.  
PRO  
YES  
3
t
27  
COMPUTER SETUP 4  
This setup menu includes: sleep time, locations of display, cadence source, cycle computer mode,  
heart rate monitor, and auto start/stop. You are unable to move back to a previously viewed set-  
tings. You must restart setup 4 to make corrections.  
PRO  
4
1) Press [SELECT] to set how many minutes the computer will stayawake”  
after not receiving a valid speed or heart rate signal. Press [MODE] to save.  
NOTE:The shorter the sleep time the better the battery life.  
4
4
SLEEP  
2) Press [SELECT] to determine what is displayed in the middle line. (mi =  
speed, c = cadence, ( ) = heart rate). Press [MODE] to save.The selected  
metric will flash during the ride. NOTE: If heart rate or cadence is selected  
speed is not displayed. This is useful for intervals when power, heart rate  
and cadence are most important.  
PRO  
mi  
3) Press [SELECT] to determine cadence information source.  
Default = pedal then hub  
PRO  
P
4
Hu  
p e d a l  
c
Pedal = crank only  
Hub = hub only  
NOTE: An optional cadence sensor is available (sold separately).  
Press [MODE] to save.  
28  
PRO  
4) The PowerTap can be used as a cycle computer or heart rate monitor.  
Press [SELECT] to toggle through mode options.  
watts  
4
mi  
watts, mi, and ( ) = power meter mode  
mi, and ( ) = cycle computer mode  
(
) = heart rate monitor mode  
Press [MODE] to save.  
PRO  
watts  
5) Press [SELECT] to toggle through auto start options.  
4
mi  
mi, and data = allows trip time to count when wheel speed is registering.  
Trip time stops 3 sec. after if speed is not registered.  
data  
(
), and data = allows trip time to count as long as a heart rate signal is  
registered. This function is useful in the transition from cycling to running  
and vice versa.  
Press [MODE] to save.  
29  
COMPUTER SETUP 5  
This setup allows the CPU to learn a new device or sensor such as the hub, heart rate strap and  
optional cadence sensor. NOTE:This process only needs to be used if a new sensor or hub is  
being used in conjunction with your CPU or vice versa and if batteries are changed in the hub or  
chest strap. There are 2 Learn sequences, 1 and 2. Learn 1 is used when you have switched sen-  
sors or the CPU and there are no other like bikes with PowerTap SL2.4 within a 30’radius. Learn 2  
is used if there are other devices in the area but requires you to remove and reinsert the battery  
before activating the Learn 2 sequence.  
hub  
1) To manually change the hub I.D. Push [Select] to toggle through the  
Hub I.D. Press [Mode] to save.  
Id  
45847  
hub  
2) In most cases the Hub I.D. will not be known so you can "learn" the I.D. by  
pressing [Mode] to advance through the Hub I.D. settings to Learn 1. NOTE:  
Learn 1 will search for any active hub so be sure that there are no other  
active hubs in the area. If there are, proceed to Learn 2.  
1
1
Id  
LEArn  
hub  
Id  
3) Learn 1 is initiated by Holding [Select] until "Learn" begins flashing.  
When the CPU has learned the device I.D. it will display the I.D.  
Press [Mode] to advance to the next device I.D. If it did not learn the device  
it will take you back to the most recent Hub I.D. NOTE: Make sure the hub is  
"awake" by spinning the wheel or axle.  
LEArn  
flashing  
hub  
Id  
4) Press [Mode] until Learn 2 is displayed. Learn 2 is used when there are  
other "awake" or active PowerTap SL 2.4 hubs within a 30 foot radius.  
2
LEArn  
5) Initiate Learn 2 by first removing the batteries from the hub for 5  
seconds and replacing them.Then hold [Select] until "Learn" begins to  
flash. When the CPU has learned the hub I.D. it will display the I.D.  
Press [Mode] to save and proceed to the next device I.D. If it did not learn  
the device it will take you back to the most recent Hub I.D.  
hub  
Id  
2
LEArn  
flashing  
30  
6) Follow the above steps for any additional sensors you may be using,  
such as the heart rate strap, speed and cadence sensors.  
SPd = speed sensor  
Cd = cadence sensor  
HS = heart rate sensor  
31  
Maintenance & Specifications  
The following information will help you keep your PowerTap SL2.4 running properly. If you are  
not familiar with hub maintenance please consult a professional  
bicycle mechanic before servicing.  
During the course of any repair do not remove the torque tube. There are no user serviceable  
parts inside. Special tools are required for reassembly and calibration. If problems are suspected  
contact Saris Cycling Group.  
BEARINGS  
The power measuring components inside the PowerTap SL2.4 are highly complex and should  
only by serviced by Saris Cycling Group.The bearings are sealed type 6901RS and do not require  
replacement. Field replacement can cause permanent damage to the power measuring electron-  
ics and result in compromised sealing and performance. If bearing problems are suspected  
please contact Saris Cycling Group at 1-800-783-7257 for a return authorization.The PowerTap  
SL2.4 uses a modern 4 bearing design and does not require any tensioning adjustment.  
FREEHUB  
The grease in the freehub pawls should be replaced if it becomes contaminated with water.  
Replace the seal at the same time, contact Saris Cycling Group for replacement parts. Saris  
Cycling Group recommends the following types of grease to ensure proper functioning:  
-Kluber Isoflex NB52 o  
-Dupont Krytox GPL226  
Warning: Failure to use the proper grease on the freehub pawls could result in engagement  
problems.  
FREEHUB REPLACEMENT  
-See Figure 28 for illustrations  
-Use 5mm hex wrench and 17mm bike wrench and remove both end nuts from the axle.  
-Remove the axle  
-Remove the freehub and spacers.  
-Remove all old grease from the freehub ratchet ring.  
32  
-Install spacers per the illustration.  
-Install axle.  
-Apply 2 grams of high quality freehub grease to the ratchet ring.  
-Grease the V seal and place it on the freehub and install onto shaft.  
-Replace end nuts.Torque end nuts to 12 lbs-ft.  
FIGURE 28  
33  
COMPUTER BATTERIES  
FIGURE 29  
The PowerTap SL2.4 has batteries in the hub and computer. Computer bat-  
teries typically need to be changed every 400 hours of use.The computer  
will also saylow bat”when the computer battery needs to be changed.This  
message is displayed after a clr”is performed.To replace computer battery  
(Type CR2032), remove the computer from the mount. Remove the battery  
cover on the back of the computer (use a cone wrench to remove the bat-  
tery cover), exchange the battery, and replace the cover as shown below  
(FIGURE 29).  
TECHNICAL SPECIFICATIONS  
Accuracy  
+/-1.5%  
Signal Transmission  
Interval Data Storage  
Interval Display  
Operational Temperature  
Battery Life (Hub)  
Battery Life (Console)  
Battery Type (Hub)  
Battery Type (CPU  
2.4 Ghz  
Unlimited  
9 Intervals (internal recording)  
0 to 40 degrees c or 32 to 104 f  
300 hours approx.  
400 hours approx.  
Type 357 or EPX 76 (2 ea)  
ER2032  
RANGE OF MEASUREMENT  
Power  
0-1999 Watts  
Torque  
0-1999 inch-lbs.  
Speed  
Distance  
Trip Time  
Cadence  
2-59 mph (3-95 KPH)  
0.00 to 9999.99 (Miles)  
0.00.00-999.99 Minutes  
40-140 RPM  
Total energy  
Odometer  
Heart Rate  
0-99999 Kilojoules  
0-99999 Miles or Kilometers  
0-255 BPM (Beats per Minute)  
34  
HUB BATTERIES  
Normal battery life in the hub is 400 hours of actual ride time. Use #357 or EPX76 Silver Oxide  
type batteries and always replace batteries in pairs. Alkaline type batteries give shorter life and  
poorer performance. NOTE: After replacing batteries in the hub you need to Learn the device  
codes. See computer setup 5.  
BATTERY REPLACEMENT  
- Unscrew the plastic battery cover. Use a spanner wrench or bench vise opened wide to get it  
started if stuck.There are O-ring seals that can cause the cover to resist the start of motion.The  
threading is normal right hand.  
- Remove the battery pack. A small screw driver can be used back and forth between the to ends  
to start to lift it out.  
- Pop the battery out by bending the plastic retaining tap back and pushing the batter up from  
the bottom.  
- Check that the electrical connector tab from the inside of the hub is perpendicular to the  
bottom of the battery pocket. If the tab gets bent, gently press it back to perpendicular with  
a non-sharp tool.  
-Slide the battery pack back into position along the center core. As the battery is engaged a small  
increase of resistance to installation should be felt as the electrical connections are made.  
- Thread the cap all the way back on.  
- Replacement O-rings and battery packs are available from Saris Cycling Group.  
35  
TEST MODE  
1) From the computer setup main menu press [SELECT] and scroll until the lettertis flashing.  
Press [MODE] to enter setup mode.  
2) Press [MODE] to scroll through the different test modes as shown by the number. NOTE: Press  
and hold [MODE] and [SELECT] simultaneously returns to standard operation.  
0 - Model and version.  
Displays the model on the middle line and version number on the bottom line.  
1 - LCD Test  
Press [SELECT] all the LCD segments are displayed. Press [SELECT] to return to the normal screen.  
2 - Heart Rate Signal Test  
NOTE:The heart rate signal is illuminated.  
The middle line display flashes88”with each heart rate blip received.  
3- Torque Information  
NOTE:The T icon is displayed.  
This displays information about the internal workings of the torque readings.The bottom display  
is the offset torque value directly sent by the hub torque with no correction applied.The hub  
sends a value of approximately 512 as the zero point.The middle line display is the correction  
offset value currently stored in the computer.This is the value that is changed when you do a  
manual zeroing of the torque.The top display is the corrected actual torque (the bottom value  
minus the middle value).  
4 - Standard Test File  
This mode writes a small test file to the memory. Press [SELECT] and the bottom lines saysrun”  
and then yes”when the file is written.This file can then be downloaded.  
5 - Communication Loop Back Test  
When looking at the front side of the computer, use a coin or paper clip to short out the two pins  
36  
on the left side. Press [SELECT].The bottom line will sayrun”and then yes”if it passes the test  
correctly. If the pins are not shorted together or there was a problem, the display will sayno.This  
test can be repeated by pressing [SELECT].  
6 - Fast Memory Test  
This tests the memory in the computer. Press [SELECT] and run”is displayed on the bottom line.  
When the test is completed and it passes, it saysyes. If the test should fail, the bottom line will  
sayno.  
37  
Troubleshooting  
No display on computer screen  
· Computer is asleep – Press [MODE] or [SELECT] on the computer to wake up the computer.  
· Batteries need replacement - replace the computer batteries as shown on pages 14-15 of the  
User Manual.  
· Computer is too cold- operating temp. is 32 to 110 degrees Fahrenheit  
Computer display is on, but there is no transmission icon  
· Hub is asleep - spin the wheel to wake up the hub.  
· Batteries need replacement - replace the hub batteries as shown on page 34 of the  
User Manual.  
· Does the word watts”appear under the top line? If no than you have entered cycle computer  
mode. See cycle computer mode for further instructions.  
· Computer not seated in mount - make sure computer is firmly and correctly mounted in  
handlebar mount.  
· Moisture in hub - remove cover to see if there is any condensation on the battery cover. If there  
is, leave cover off in a dry place for 12 hours or until moisture disappears.  
· Interference with other devices - make sure you are not setting up the PowerTap inside a  
building with a lot of electrical noise, neon signs, or near power lines. Bring the PowerTap out  
side or away from the electrical disturbance to see if signal returns. Also make sure you dont  
have any other devices on your bike such as lights, magnets or cycle computer sensors.  
· PowerTap computers batteries are low, replace batteries as shown on page 34 of the  
User Manual.We recommend using a Cone Wrench to remove the battery cap, not a coin.  
· Displayed data blinks or does not function  
· Batteries need replacement - replace the computer batteries as shown on pages 34 of  
the User Manual.  
· Computer not seated in mount - make sure computer is firmly and correctly mounted in  
handlebar mount.  
· Interference with other devices - make sure you are not setting up the PowerTap inside a  
building with a lot of electrical noise, neon signs, or near power lines. Bring the PowerTap  
outside or away from the electrical disturbance to see if signal returns. Also make sure you dont  
have any other devices on your bike such as lights, magnets or cycle computer sensors.  
38  
Power seems incorrect  
·Torque value is not zeroed to manually zero torque go to current watts and hold down the  
select button until watts disappears.Torque is now being displayed.To zero torque hold down  
the select button until the value reads zero.To exit torque mode press select once. If read zero  
the torque does not seem to recalibrate the unit call Saris Cycling Group customer service at  
1-800-783-7257.  
Speed seems incorrect  
· Wheel size incorrect -refer to the chart on page 25 and enter the correct size in setup mode.  
Transmission icon flashes rapidly  
· Hub batteries need replacement - replace the hub batteries as shown on page 34 of  
the User Manual.  
Glossary  
Computer - Refers to the yellow handlebar or stem mounted device.  
Heart Rate (HR) - This displays current HR. Max and average values are displayed if [MAX] or  
[AVG] is selected. NOTE: A non-coded chest strap must be used in order for the console to  
39  
pick up heart rate.  
Watts - Real-time display of the effort you are putting in to pedaling the bike. This is your power  
reading. **If you press the [SELECT] while the cursor is pointing to Watts the line changes to  
"inch-lbs". This is the raw torque value that is being applied to the hub, NOT your power in watts.  
Cadence (C) - The number of pedal revolutions per minute. The rate of pedaling is shown from 0  
to 140 RPM.  
Speed - The estimated speed that you would be traveling on a flat road with no wind is displayed  
here.  
Scroll = to move vertically through available menu or screen options  
Toggle = to move horizontally through alphanumeric digits  
Cursor = the ® arrow located on console screen  
Metrics = a standard of measurement  
MAX = Max  
RPM = Revolutions Per Minute  
MI = Miles Per Hour  
KM = Kilometers Per Hour  
UI = User Interface  
40  
Saris Cycling Group, Inc.  
5253 Verona Road  
Madison,WI. 53711  
1-800-783-7257  
16034D-2.4  
Patents issued and pending.  
Patent#6,418,797  
41  

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