TABLE OF CONTENTS
Overview
Step-by-step guide to replacing the right-side power meter. Estimated time – 25 minutes
Tools required
- 3 mm hex key
- 15 mm pedal wrench or narrow 15 mm open ended wrench for pedals with wrench flats, or correctly sized hex key for all other types.
- 8 mm hex key
- 5 mm hex key
- Torque wrench with 8 mm and 5 mm hex bits (torque range up to 57 N⋅m / 42 ft⋅lb)
- Phillips head screwdriver #0
Replacement parts
- 971-9510, POWER METER, CRANK, RT, MULTIPOS
- 000-8068, HDWR, FHCS, M8X1.25X16MML, SS, TL (if needed)
Replacement instructions
Unplug bike
Before starting the repair, remove the power connector from the bike behind the rear leg.
Remove the right pedal, if installed.
Using a 15 mm pedal wrench (or corresponding hex key), remove the right-side pedal by turning it counter-clockwise, then set it aside for reassembly later.
Remove the drive side belt guard cap.
Use a 3 mm hex key to loosen and remove the two longer screws from the belt guard cap.
Note: Slide the cap forward and rotate the cap away from the bike fork to remove it from the 2 shoulder bolts holding the cap in place.
Remove the belt guard.
Starting at the front of the belt guard (near the flywheel), use a 3 mm hex key (or small ratcheting tool to assist with the tight angle) to loosen the 2 screws holding the front of the guard at least 2 turns. Do not remove these screws.
Use a 3 mm hex key to remove the 7 screws and washers around the perimeter of the belt guard, set aside for reassembly.
Note: 4 of the screws are longer than the other 3.
- The long screws are used to connect the guard to the left belt guard (#1,5,6,7).
- The short screws are used to connect the guard to the steel frame (#2,3,4).
Align the right crank in the 6 o’clock position.
Holding onto the back of the belt guard, pull down and away from the bike.
When removing the guard, pay particular attention to this area to avoid damaging the rubber grommet piece:
Push downward and upward to work the front of the belt guard free from the 2 front screws.
ATTENTION: If the guard is difficult to remove, further loosen the two front screws.
Rotate the top of the belt guard away from the bike, working it down along the crank arm and off the bike.
ATTENTION: Do not rotate the crank at this time. It can be difficult to move if the belt is touching the belt guard. Keep fingers and clothing away from the exposed belt to avoid injury.
Once completely removed, the belt and drive pulley are fully visible.
Note: At this time, use your hands to loosen the 2 screws that hold the front of the guard a few turns to make reassembly easier at the end of the install
Slide off the drive belt.
Slide the belt off the large pulley wheel and rotate it out of the way.
Remove the right crank assembly.
Using an 8 mm hex key, turn the center crank bolt counter-clockwise to remove the drive side crank assembly.
Note: The crank assembly attaches using a self-extracting bolt. This means that the pressure to unscrew the bolt may increase as it pushes the crank arm off the bottom bracket spindle. This is normal. Just keep rotating the bolt until the crank arm is fully removed.
Remove the belt pulley/drive wheel from the right power meter.
Using a 5 mm hex key, remove the four silver screws from the back side of the right crank assembly.
Tap the pulley wheel to break it loose from the right crank arm if it is not freed after removing the 4 screws.
Install the belt pulley/drive wheel onto the new power meter.
Using a 5 mm hex key, reinstall the pulley using the four silver screws from the back side of the new right power meter crank arm. Tighten the screws in a criss-cross pattern and torque evenly to 11-13 N·m (8-10 ft·lb). Check each screw an additional time after torqueing each one to spec.
Reinstall the right crank assembly.
Fit the crank/large pulley assembly back on the bottom bracket splines. Align the crank arm exactly 180 degrees from the left side before beginning to tighten the bolt.
While holding the crank assembly onto the splines, use an 8 mm hex key to begin tightening the bolt back onto the bottom bracket splines. The bolt should thread on easily and not require excessive force to begin threading in. If any extra resistance is encountered, unthread the bolt and begin again to ensure no cross-threading occurs.
Set your torque wrench in the range of 52-57 N·m (38-42 ft·lb) and completely tighten the bolt until the torque wrench clicks.
Note: Check behind the pulley to ensure no gap exists between the pulley and bottom bracket. It is possible for this torque range to not fully seat the crank arm. If the crank arm is not fully seated, continue tightening the crank arm on until no gap is visible.
Reinstall the drive belt
Fit the drive belt back on the small pulley wheel, then slide it over the large pulley wheel, aligning all of the teeth with the belt in the same manner as it was removed. The belt is installed onto the pulley from the side, not twisted or rotated onto the pulley wheel by rotating the crank.
Note: Do not rotate the crank until the belt is fully installed, as this may apply twisting forces to the belt. Twisting the belt during install can result in damage to the belt’s carbon fibers, which can result in premature failure.
As the teeth are lined up with the pulley wheel, gently slide the belt onto the pulley from the side.
After the belt has been completely fit by hand onto the large pulley wheel, rotate the crank at least 2 rotations to allow the belt to self-align.
Reinstall the right belt guard.
Starting with the crank arm facing down, insert the crank arm into the opening in the belt guard and slowly work the guard up and forward.
Watch the central plastic post on the inside of the guard so that it does not get hung up on the drive belt.
When positioning the guard, make sure to tuck the belt underneath, as it has a tendency to get stuck.
As you fit the guard into position, make sure the slots on the front of the guard slide onto the fixed screws on the frame.
Tips:
- Make sure the boss on the inside center of the guard goes through the belt (can get stuck on the bottom of the belt).
- Do not force the guard, if it is aligned correctly, it will go into place.
- Make sure the top of the guard near the top tube is aligned properly, with grommet seated on both belt guards.
- To make sure the guard is aligned correctly, check the alignment with the left side belt guard, there should be no ledges anywhere.
- Make sure the 2 front screws are correctly aligned.
- Check clearance between power meter housing and belt guard, you should see 3 mm or more space between these two at all positions of the power meter rotation.
Once the guard is set in place, reinstall the guard screws. Thread the three shorter screws into the frame of the bike and the four longer screws into the left side guard.
Tighten them down but be careful NOT to over-tighten them. You may need to hold the right and left side belt guards together to get the longer screws to start.
Once the belt guard is set in place, use a 3 mm hex key to tighten the 2 screws holding the front of the guard down snugly against the frame.
Reinstall the drive side belt guard cap.
Insert the closed end (or top) of the guard slides first, then align the bottom slide onto the shoulder bolts. As with removal, you may need to angle or push the guard in to get it to fit in place.
Once fitted, reinstall the front screws using a 3 mm hex key.
Reinstall the right pedal, if previously installed.
Hand-thread the right-side pedal into the corresponding crank arm length hole (matching the length selected on the left side) by turning it clockwise.
Use a 15 mm pedal wrench (or corresponding hex key) to tighten the pedal until it is snug (torque specification may vary by pedal manufacturer).
Plug the bike into external power.
Re-plug the bike into external power.
Configure the power meter in the Stages Cycling app.
After completing the physical installation, the new right-side power meter must be paired to the bike to complete the installation. Using a size #0 Phillips head screwdriver, slightly unscrew the battery cover and remove the plastic battery isolation strip, then re-tighten the battery cover (tighten until snug, do not over-tighten).
- Open the Stages Cycling app. Ensure the SB20 is powered on and the new power meter is awake (rotate the crank arms if the power meters have not been moved in over 5 minutes).
- Click the Devices icon > Select your Stages Bike SB20 or add it as a new device > Power meters.
- Tap the power meter IDs to bring up the power meter configuration menu.
- Locate the ANT+ ID sticker on the inside edge of your new right power meter and input it into the Right ANT ID field.
- Select OK. The app will begin pairing your new power meter. This can take 30 seconds or longer.
- The bike will disconnect and reconnect from the app during the pairing process. Once the bike has reconnected, position the cranks in the vertical position and tap the Zero Reset button.
- After completing the zero reset, you can exit the app and your bike is now ready to ride.