Model No. 831.21521.0
Serial No.
BIKE EXERCISER
User’s Manual
Serial
Number
Decal
• Assembly
• Operation
• Maintenance
• Part List and Drawing
CAUTION
Read all precautions and instruc-
tions in this manual before using
this equipment. Keep this manual
for future reference.
Sears, Roebuck and Co., Hoffman Estates, IL 60179
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BEFORE YOU BEGIN
®
Congratulations for selecting the new PROFORM GR
80 exercise cycle. Cycling is one of the most effective
exercises for increasing cardiovascular fitness, building
endurance, and toning the body. The GR 80 exercise
cycle offers a selection of features designed to let you
enjoy this healthful exercise in the convenience and
privacy of your home.
after reading this manual, please call 1-800-4-MY-
®
HOME (1-800-469-4663). To help us assist you,
please note the product model number and serial
number before calling. The model number is
831.21521.0. The serial number can be found on a
decal attached to the exercise cycle (see the front
cover of this manual).
For your benefit, read this manual carefully before
Before reading further, please familiarize yourself with
the parts that are labeled in the drawing below.
you use the exercise cycle. If you have questions
Fan
Console
Pulse Sensor
FRONT
Pedal/Strap
Seat
Adjustment Knob
Handlebar
Wheel
REAR
RIGHT SIDE
CAUTION: The warning decal shown above has been placed on the exercise cycle in the
location shown. If the decal is missing, or if it is not legible, call toll-free 1-888-533-1333 and
order a free replacement decal. Apply the decal in the location shown.
3
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ASSEMBLY
Assembly requires two persons. Place all parts of the exercise cycle in a cleared area and remove the packing
materials. Do not dispose of the packing materials until assembly is completed.
In addition to the included tools, assembly requires a Phillips screwdriver
adjustable wrenches
and two
.
Use the drawings below to identify the small parts used for assembly. The number in parentheses below each
drawing is the key number of the part, from the PART LIST on page 14. The number following the key number is
the quantity needed for assembly. Note: Some small parts may have been pre-assembled. If a part is not in
the parts bag, check to see if it has been pre-assembled. If a part is missing, call toll-free 1-888-533-1333.
M6 Washer
(55)–8
M8 Nylon
M10 Nylon
M8 Split
Locknut (60)–4
Locknut (63)–4
Washer (59)–5
M4 x 16mm
Round Head
Screw (52)–4
M6 x 42mm Button
Screw (49)–4
M6 x 38mm Button
Bolt (48)–4
M8 x 25mm Button
Screw (33)–3
M8 x 70mm Button
Bolt (54)–2
M10 x 75mm Carriage Bolt (51)–4
4
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1. While another person lifts the front of the Frame (1)
slightly, attach the Front Stabilizer (3) to the Frame
with two M10 x 75mm Carriage Bolts (51) and two
M10 Nylon Locknuts (63).
1
3
51
See the inset drawing. Loosen the Adjustment Knob
(17), slide the Rear Frame (2) out of the Frame (1),
and then retighten the Adjustment Knob.
1
Note: After the exercise cycle is assembled, adjust the
Seat (not shown) to the proper position. As you pedal,
there should be a slight bend in your knees when the
pedals are in the farthest forward position. Loosen the
Adjustment Knob (17), slide the Rear Frame (2) for-
ward or backward, and retighten the Adjustment Knob.
17
63
1
2
2. Attach the Wheels (18) to the Rear Stabilizer (4) with
two M8 Nylon Locknuts (60). Press a Wheel Cap (19)
onto each Wheel.
2
19
60
51
63
4
Attach the Rear Stabilizer (4) to the Rear Frame (2)
with two M10 x 75mm Carriage Bolts (51) and two
M10 Nylon Locknuts (63).
2
18
63
60
19
18
3. Attach one of the Seat Frames (7) to the Handlebar
(6) with an M8 x 70mm Button Bolt (54), an M8 Split
Washer (59), and an M8 Nylon Locknut (60). Do not
tighten the Button Bolt yet.
3
54
59
Attach the other Seat Frame (7) in the same way.
7
6
60
4. Slide the Seat Frame Top (8) onto the Seat Frames
(7). Attach the Backrest (5) to the Seat Frames and
the Seat Frame Top with four M6 x 38mm Button
Screws (48) and four M6 Washers (55). Do not tight-
en the Button Screws yet.
4
8
5
55
48
55
48
7
5
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5. Have another person hold the Seat Frames (7) under
the Rear Frame (2) as shown. Attach the Seat Frames
and the Seat (12) to the Rear Frame with four M6 x
42mm Button Screws (49) and four M6 Washers (55).
5
12
See step 3. Tighten the two M8 x 70mm Button
Bolts (54).
2
See step 4. Tighten the four M6 x 38mm Button
Screws (48).
55
7
55
49
55
49
6. The Console (16) requires four D batteries (not includ-
ed); alkaline batteries are recommended. Press the
tab on the battery door and remove it. Insert four bat-
teries into the Console as shown. Make sure that the
batteries are oriented as shown by the markings
on the battery door. Reattach the battery door.
6
16
Batteries
Tab
Battery Door
7. Connect the console wire harness to the Upper Wire
Harness (36). Insert the console wire harness into the
Upright (13). Attach the Console (16) to the Upright
with four M4 x 16mm Round Head Screws (52).
7
Console
Wire
Harness
52
16
36
13
6
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8. Connect the Upper Wire Harness (36) to the Lower
Wire Harness (65). Attach the Upright (13) to the
Frame (1) with three M8 x 25mm Button Screws (33)
and three M8 Split Washers (59). Be careful to avoid
pinching the Wire Harnesses.
8
13
33
36
65
33
59
59
1
33
9. Identify the Left Pedal (24), which is marked with an
“L.” Using an adjustable wrench, firmly tighten the
Left Pedal counterclockwise into the left arm of the
Crank (31). Tighten the Right Pedal (not shown) clock-
wise into the right arm of the Crank. Important:
Tighten both Pedals as firmly as possible. After
using the exercise cycle for one week, retighten
the Pedals. For best performance, the Pedals must
be kept tightened.
9
31
25
Adjust the left Pedal Strap (25) to the desired position,
and press the end of the Pedal Strap onto the tab on
the Left Pedal (24). Adjust the right Pedal Strap (not
shown) in the same way.
24
Tab
10. Make sure that all parts are properly tightened before you use the exercise cycle. Note: After assembly is
completed, some extra parts may be left over. Place a mat beneath the exercise cycle to protect the floor.
7
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HOW TO OPERATE THE EXERCISE CYCLE
Increase
Button
Fan
Program
Profiles
Button
Program
Indicator
Pace
Program/Manual
Button
Display
Decrease
Button
Guide
FEATURES OF THE CONSOLE
HOW TO USE THE MANUAL MODE
Turn on the console.
The advanced console offers a selection of features
designed to make your workouts more enjoyable and
effective. When the manual mode of the console is
selected, the resistance of the pedals can be changed
with the touch of a button. As you pedal, the console
will provide continuous exercise feedback. You can
even measure your heart rate using the built-in hand-
grip pulse sensor.
1
To turn on the console, press the Increase button
or begin pedaling. The pace guide will light for a
moment; the console will then be ready for use.
Select the manual mode.
2
3
In addition, the console features two pulse programs
that change the resistance of the pedals and help you
to maintain a steady pedaling pace to keep your heart
rate near a target heart rate setting while you exercise.
When the power is turned on, the manual mode
will be selected. If you have selected a program,
reselect the manual mode by pressing the
Program/Manual button until no program indica-
tors (see the drawing above) appear along the left
side of the display.
The console also offers two preset programs. Each
program automatically changes the resistance of the
pedals and prompts you to increase or decrease your
pedaling pace as it guides you through an effective
workout.
Change the resistance of the pedals as desired.
As you pedal,
change the resis-
To use the manual mode of the console, see the
instructions at the right. To use a pulse program, see
page 10. To use a preset program, see page 11.
tance of the pedals
by pressing the
Increase and
Decrease buttons.
Before using the console, make sure that batteries are
installed (see assembly step 6 on page 6). If there is a
sheet of clear plastic on the display, remove the plastic.
There are ten resis-
tance levels. Note: After the buttons are pressed,
it will take a moment for the pedals to reach the
selected resistance level.
8
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Next, hold the handgrip pulse sensor with your
palms resting on the contacts. When your pulse
is detected, the heart-shaped indicator in the
lower half of the display will flash each time your
heart beats, and your heart rate will be shown.
Monitor your progress with the display.
4
The upper half of
the display will
show the elapsed
time, the distance
For the most accurate heart rate reading, continue
to hold the handgrip pulse sensor for about 30
seconds. Note: If you continue to hold the hand-
grip pulse sensor, the display will show your heart
rate for about 30 seconds. The display will then
show your heart rate along with the other modes.
If your heart rate is not shown, make sure that
your hands are positioned as described. Avoid
moving your hands excessively or squeezing the
metal contacts too tightly. For optimal perfor-
mance, periodically clean the metal contacts
using a soft cloth; never use alcohol, abrasives,
or chemicals.
you have pedaled,
and the resistance
level of the pedals.
The display will change from one mode to the
next every few seconds.
The lower half of
the display will
show your pedal-
ing speed and the
approximate num-
ber of calories you
have burned. The
display will change from one mode to the other
every few seconds. The lower half of the display
will also show your heart rate when you use the
handgrip pulse sensor (see step 5). Note: When a
program is selected (except for pulse program 1),
the display will show the time remaining in the
program instead of the elapsed time.
Turn on the fan if desired.
6
7
To turn on the fan at low speed, press the fan
button. To turn on the fan at high speed, press
the fan button a second time. To turn off the fan,
press the fan button a third time. Note: If the fan
is turned on but the pedals are not moved for thir-
ty seconds, the fan will automatically turn off to
conserve the batteries.
Note: The console can display speed and dis-
tance in either miles or kilometers. The letters
MPH or KM/H will appear in the lower half of the
display to show which unit of measurement is
selected. To change the unit of measurement, first
hold down the
Slide the thumb tab
on the right side of
the fan to adjust
the angle of the
fan.
Thumb
Tab
Program/Manual
button for several
seconds. An E (for
English) or an M
(for metric) will
When you are finished exercising, the console
will automatically turn off.
appear in the dis-
play. Press the
Increase button to change the unit of measure-
ment. When the desired unit of measurement is
selected, press the Program/Manual button again.
Note: When the batteries are replaced, it may be
necessary to reselect the desired unit of measure-
ment.
If the pedals are not moved for a few seconds, the
time will begin to flash and the console will pause.
If the pedals are not moved for a few minutes,
the console will turn off and the display will be
reset.
Measure your heart rate if desired.
5
If there are
sheets of clear
plastic on the
metal contacts
on the handgrip
Contacts
pulse sensor,
remove them.
9
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Begin pedaling to start the program.
HOW TO USE A PULSE PROGRAM
5
Pulse program 1 is 30 minutes long, and is
divided into several time periods of different
lengths. One target heart rate is programmed for
each period. Pulse program 2 is sixty minutes
long (you may choose to use only part of the pro-
gram). The same target heart rate is programmed
for the entire program.
Pulse program 1 is designed to keep your heart rate
within a set range during your workout. Pulse program
2 is designed to keep your heart rate near a target
heart rate setting that you select.
Follow the steps below to use a pulse program.
During the program, the console will regularly
compare your heart rate to the target heart rate
setting. If your heart rate is too far below or above
the target heart rate setting, the resistance of the
pedals will automatically increase or decrease to
being your heart rate closer to the target heart rate
setting. Note: If the resistance level is too high or
too low, you can override it by pressing the
Increase and Decrease buttons. However, when
the console compares your heart rate to the tar-
get heart rate setting, the resistance may auto-
matically change.
Turn on the console.
1
See step 1 on page 8.
Select a pulse program.
2
To select pulse
program 1 or 2,
press the
Program/Manual
button repeatedly
until the number 1
or 2 appears
After the first minute of the program, the pace
guide will help you to maintain a steady pedaling
pace. When one of the two lower indicators
lights, increase your pace; when one of the two
upper indicators lights, decrease your pace.
When the center indicator lights, maintain your
current pace. Important: The pace guide is
intended only to provide a goal. Make sure to
pedal at a pace that is comfortable for you.
along the left side
of the display.
Enter a target heart rate.
3
If pulse program 1 is selected, the maximum
target heart rate setting for the program will flash
in the display (see the drawing above). Press the
Increase and Decrease buttons to change the
setting, if desired (see EXERCISE INTENSITY
on page 13). If the maximum target heart rate
setting is increased or decreased, the intensity
level of the entire program will increase or
decrease.
If pulse program 2 is selected, the target heart
rate setting for the entire program will flash in the
display. Press the Increase and Decrease buttons
to change the setting, if desired (see EXERCISE
INTENSITY on page 13).
The display will show the time remaining in pulse
program 1, or the elapsed time in pulse program
2. If you stop pedaling for a few seconds, the
program will pause and the time will flash in the
display. To restart the program, simply resume
pedaling.
Hold the handgrip pulse sensor.
4
It is not necessary to hold the handgrip pulse
sensor continuously during a pulse program;
however, you must hold the handgrip pulse sen-
sor frequently. Each time you hold the hand-
grip pulse sensor, keep your hands on the
metal contacts for at least 30 seconds. Note:
When you are not holding the handgrip pulse
sensor, the letters PLS will appear in the display
instead of your heart rate.
Monitor your progress with the display.
6
See step 4 on page 9.
10
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Turn on the fan if desired.
automatically change to the resistance level that
is programmed for the next period. Note: If the
resistance level is too high or too low, you can
override it by pressing the Increase and
Decrease buttons. However, when the current
period ends, the resistance level will automatical-
ly change if a different resistance level is pro-
grammed for the next period.
7
8
See step 6 on page 9.
When you are finished exercising, the console
will automatically turn off.
See step 7 on page 9.
During the program, the pace guide will prompt
you to increase or decrease your pedaling pace.
When one of the two lower indicators lights,
increase your pace; when one of the two upper
indicators lights, decrease your pace. When the
center indicator lights, maintain your current
pace. Important: The pace guide is intended
only to provide a goal. Make sure to pedal at a
pace that is comfortable for you.
HOW TO USE A PRESET PROGRAM
Preset programs 3 and 4 automatically change the
resistance of the pedals and prompt you to increase or
decrease your pedaling pace as they guide you through
effective workouts. The profiles printed on the left side
of the display show how the resistance level and the
target pace will change during the preset programs.
Follow the steps below to use a preset program.
Turn on the console.
1
See step 1 on page 8.
Select a preset program.
The display will show the time remaining in the
program. If you stop pedaling for a few seconds,
the program will pause and the time will flash in
the display. To restart the program, simply resume
pedaling.
2
To select preset
program 3 or 4,
press the
Program/Manual
button repeatedly
Monitor your progress with the display.
See step 4 on page 9.
until the number 3
4
5
6
7
or 4 appears
along the left side
of the display. When a preset program is select-
ed, the display will show how long the program
will last.
Measure your heart rate if desired.
See step 5 on page 9.
Begin pedaling to start the program.
Turn on the fan if desired.
See step 6 on page 9.
3
Each preset program consists of several time
periods of different lengths. One resistance level
and one target pace are programmed for each
period.
When you are finished exercising, the console
will automatically turn off.
At the end of each period of the program, the
resistance level will flash in the display for a few
seconds. The resistance of the pedals will then
See step 7 on page 9.
11
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MAINTENANCE AND TROUBLESHOOTING
Inspect and properly tighten all parts of the exercise
cycle regularly. Replace any worn parts immediately.
With the left side shield removed, locate the Reed
Switch (43). Turn the Crank (31) until the Magnet (38)
is aligned with the Reed Switch. Next, loosen, but do
not remove, the indicated M4 x 16mm Screw (57).
Slide the Reed Switch slightly closer to or away from
the Magnet, and then retighten the Screw. Turn the
Crank for a moment. Repeat until the console dis-
plays correct feedback. When the Reed Switch is cor-
rectly adjusted, reattach the left side shield and the
left pedal.
To clean the exercise cycle, use a damp cloth and a
small amount of liquid dish soap. Important: To
avoid damage to the console, keep liquids away
from the console and keep the console out of
direct sunlight.
BATTERY REPLACEMENT
If the console display becomes dim, the batteries
should be replaced; most console problems are the
result of low batteries. To replace the batteries, see
assembly step 6 on page 6.
HOW TO ADJUST THE REED SWITCH
If the console does not display correct feedback, the
reed switch should be adjusted. To adjust the reed
switch, you must first remove the Left Side Shield (9).
Using an adjustable wrench, turn the Left Pedal (24)
clockwise and remove it. Next, remove the seven
M4 x 16mm Screws (57) and the M4 x 25mm Screw
(45). Then, carefully remove the Left Side Shield.
43
31
57
38
HANDGRIP PULSE SENSOR TROUBLESHOOTING
9
57
If the handgrip pulse sensor does not function properly,
see step 5 on page 9.
57
57
45
24
57
12
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CONDITIONING GUIDELINES
The following guidelines will help you to plan your
exercise program. Remember that proper nutrition
and adequate rest are essential for successful results.
During the first few minutes of exercise, your body
uses easily accessible carbohydrate calories for ener-
gy. Only after the first few minutes of exercise does
your body begin to use stored fat calories for energy.
If your goal is to burn fat, adjust the intensity of your
exercise until your heart rate is near the lowest num-
ber in your training zone as you exercise.
WARNING:
Before beginning
this or any exercise program, consult your
physician. This is especially important for
persons over the age of 35 or persons with
pre-existing health problems.
For maximum fat burning, adjust the intensity of your
exercise until your heart rate is near the middle of
your training zone as you exercise.
The pulse sensor is not a medical device.
Various factors may affect the accuracy of
heart rate readings. The pulse sensor is
intended only as an exercise aid in determin-
ing heart rate trends in general.
Aerobic Exercise
If your goal is to strengthen your cardiovascular sys-
tem, your exercise must be “aerobic.” Aerobic exer-
cise is activity that requires large amounts of oxygen
for prolonged periods of time. This increases the
demand on the heart to pump blood to the muscles,
and on the lungs to oxygenate the blood. For aerobic
exercise, adjust the intensity of your exercise until
your heart rate is near the highest number in your
training zone.
EXERCISE INTENSITY
Whether your goal is to burn fat or to strengthen your
cardiovascular system, the key to achieving the
desired results is to exercise with the proper intensity.
The proper intensity level can be found by using your
heart rate as a guide. The chart below shows recom-
mended heart rates for fat burning, maximum fat
burning, and cardiovascular (aerobic) exercise.
WORKOUT GUIDELINES
Each workout should include the following three parts:
A warm-up, consisting of 5 to 10 minutes of stretching
and light exercise. A proper warm-up increases your
body temperature, heart rate, and circulation in prepa-
ration for exercise.
Training zone exercise, consisting of 20 to 30 min-
utes of exercising with your heart rate in your training
zone. Note: During the first few weeks of your exer-
cise program, do not keep your heart rate in your
training zone for longer than 20 minutes.
To find the proper heart rate for you, first find your age
at the bottom of the chart (ages are rounded off to the
nearest ten years). Next, find the three numbers above
your age. The three numbers are your “training zone.”
The lowest number is the recommended heart rate for
fat burning, the middle number is the recommended
heart rate for maximum fat burning, and the highest
number is the recommended heart rate for aerobic
exercise.
A cool-down, with 5 to 10 minutes of stretching. This
will increase the flexibility of your muscles and will
help to prevent post-exercise problems.
EXERCISE FREQUENCY
To maintain or improve your condition, plan three work-
outs each week, with at least one day of rest between
workouts. After a few months of regular exercise, you
may complete up to five workouts each week, if
Fat Burning
desired. Remember, the key to success is make exer-
cise a regular and enjoyable part of your everyday life.
To burn fat effectively, you must exercise at a relative-
ly low intensity level for a sustained period of time.
13
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PART LIST—Model No. 831.21521.0
R0405A
Key No. Qty.
Description
Key No. Qty.
Description
1
1
1
1
1
1
1
2
1
1
1
2
1
1
1
1
1
1
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
3
1
Frame
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
#
1
1
2
1
2
1
1
1
1
2
3
1
1
4
4
3
4
4
1
2
8
1
12
4
5
5
6
2
4
1
1
1
2
Crank Bearing Assembly
Upper Wire Harness
Bearing
2
Rear Frame
Front Stabilizer
Rear Stabilizer
Backrest
3
4
Magnet
5
Tension Bolt
6
Handlebar
Tension Bracket
M8 Washer
7
Seat Frame
Seat Frame Top
Left Side Shield
Right Side Shield
Stabilizer Endcap
Seat
8
Flywheel Washer
Reed Switch/Wire
Handlebar Endcap
M4 x 25mm Screw
Resistance Cable
Return Spring
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
Upright
Front Bushing
Rear Bushing
Console
M6 x 38mm Button Screw
M6 x 42mm Button Screw
M4 x 16mm Flat Head Screw
M10 x 75mm Carriage Bolt
M4 x 16mm Round Head Screw
5mm Spacer
Adjustment Knob
Wheel
Wheel Cap
Frame Pad
M8 x 70mm Button Bolt
M6 Washer
Frame Stop
Reed Switch Clamp
C-magnet Bracket
Left Pedal
M8 x 20mm Button Bolt
M4 x 16mm Screw
M5 Washer
Left Pedal Strap
Right Pedal
M8 Split Washer
M8 Nylon Locknut
M6 Nut
Right Pedal Strap
Resistance Motor
Flywheel Axle
Belt
M8 Jam Nut
M10 Nylon Locknut
M6 x 38mm Bolt
Pulley/Crank
C-magnet
Lower Wire Harness
User’s Manual
M8 x 25mm Button Screw
Flywheel
#
Allen Wrench
Note: # indicates a non-illustrated part. Specifications are subject to change without notice. If a part is missing,
call toll-free 1-888-533-1333. See the back cover of this manual for information about ordering replacement
parts.
14
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EXPLODED DRAWING—Model No. 831.21521.0
R0405A
8
44
55
54
59
7
5
48
54
59
57
44
55
57
48
10
6
60
12
57
55
49
57
9
55
49
55
49
45
55
49
21
57
57
19
50
63
2
60
4
18
16
63
51
33
59
18
52
59
60
33
11
19
51
52
36
3
13
22
63
57
43
29
40
35
34
42
65
11
37
57
61
58
39
57
58
37
53
62
28
35
39
41
27
1
17
30
61
50
62
31
32
47
38
24
20
23
61
46
25
14
60
26
45
15
61
64
56
15
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FULL 90 DAY WARRANTY
For 90 days from the date of purchase, if failure occurs due to defect in material or workmanship in this
Sears Bike Exerciser, contact the nearest Sears Service Center throughout the United States and
Sears will repair or replace the Bike Exerciser, free of charge.
This warranty does not apply when the Bike Exerciser is used commercially or for rental purposes.
This warranty gives you specific legal rights, and you may also have other rights which vary from state
to state.
Sears, Roebuck and Co., Dept. 817WA, Hoffman Estates, IL 60179
Part No. 224055 R0405A
Printed in China © 2005 ICON IP, Inc.
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