TABLE OF CONTENTS



Step by step guide to adjusting the belt tension on the SB20 StagesBike, time required: Less than 30 minutes


Tools required

  • 3 mm hex key
  • 6 mm hex key
  • 14 mm wrench (with ratchet preferred)
  • 7 mm socket or crescent wrench
  • Small ratcheting 3 mm hex key


Optional tools:

  • Small ratcheting 3 mm hex key


Note: For this article, the sides of the bike will be referred to as the Drive Side (side with belt) and Non-Drive Side.


Removal of the Drive Side belt guard cap is required, as is removal of the front and rear flywheel caps on the Non-Drive Side.


Replacement instructions


Unplug bike


Remove the power connector from the bike behind the rear leg before starting the repair.


Remove the front plastic caps from the flywheel of the bike.


Use the 3 mm hex key to loosen 2 screws and remove the front drive side belt guard cap; set aside for reassembly later.



Slide the cap forward and rotate the cap away from the bike to remove it from 2 shoulder bolts holding the cap in place. You may need to push on the cap to get the upper shoulder bolt to clear the cap.




Repeat this procedure to remove the two flywheel caps on the non-drive side of the bike.





Loosen the Stator stay retaining bolt.
Use a 6 mm hex key to loosen the cap head set screw above the bracket on the left side of the flywheel about 1 turn. (It may be required to use a cheater bar on short end to loosen the screw)



Loosen the Flywheel Axle Nuts


Use a 14 mm wrench to loosen the nuts on either side of the flywheel.



Tension belt


Use a 7 mm wrench to adjust the nuts on the tensioner assemblies to get the belt to the desired tension. Adjust these in even increments so that the axle stays straight relative to the frame. Misalignment of the flywheel axle will cause damage to the bike.




Adjust each tension bolt such that the flywheel axle remains straight relative to the frame. Tension on the belt can be checked by hand under the plastic belt guards. There should be about 1/2”, or 12-15 mm of deflection near the sprocket.


 


If belt tension can be measured with an accurate sonic tension meter (this is not required), the tension setting may be checked against Table 1, below:


DescriptionTarget Tension Settings (Hz)Factory Tension Range (Hz)
9mm Gates Carbon Belt 32, +/- 328-40

 


Make sure that the belt tightness and flywheel alignment are checked and correct before moving on. 


Tighten axle nuts


Use a 14 mm wrench to tighten the nuts on either side of the flywheel. The recommended torque spec is 22 ft.-lbs, or 30 N⋅m.



Tighten stator stay


Use a 6 mm hex key to tighten the pictured cap screw on top of the bracket. (It may be required to use a cheater bar on the hex key short end to tighten the screw.)



Test bike

  1. Hand pedal the bike using the left crank before plugging it in to make sure there are no rubbing noises or anything unusual.
  2. Ride the bike to test the feeling of the bike, listening for unusual noises as well. 
  3. If no noises exist, proceed with completing the re-assembly.
  4. If any noises exist, re-check previous steps to ensure everything is assembled properly. 


Reinstall the drive side belt guard cap


Use a 3 mm hex key to install the flywheel cover. Note that the shoulder bolts must be aligned with the corresponding openings on the cover. 


 


Install the non-drive side flywheel caps


Use a 3 mm hex key to install the rear flywheel cap. 



Use a 3 mm hex key to install the front flywheel cap.



Plug bike into external power


Re-plug bike into external power.



Pedal bike and check operations


Pedal bike for a bit to ensure everything operates smoothly and as intended