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The Ultimate SB20 Troubleshooting Guide

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Here are the most  common SB20 problems  based on  Stages support postings  and  social media : Power Meters Wireless Connections (Mostly Zwift and Stages Cycling app) Resistance Issues Drive Belt (Tension and Alignment) Shifter Buttons Clicks and Noises Flywheel Concerns Crank Smoothness Settings and customizations With this list in mind, here is my summary covering the most common problems I have helped people resolve since 2021.   See the  FAQ  for additional details on how this list was compiled. YOUR FEEDBACK IS REQUESTED   If you have additional information or experiences, please share in the comments. ___________________________ SB20 TROUBLESHOOTING This section lists  21 different problem descriptions  with links to common causes and suggested solutions. 1. Sudden Drop in Resistance Resistance is normal until more power (force) is applied.  Resistance suddenly reduces - sometimes to zero. Possible Causes See  ...
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SB20 - Repair Videos

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 Here is a list of the videos I have released over the past 5 years. 1. Drive Belt Replacement Related blog post:  SB20 - Drive Belt Replacement 2. Flywheel Bearing Replacement Related blog post:  SB20 - Flywheel Bearing Replacement 3. Simplifying Flywheel Bearing Service Related blog post:  SB20 - Simplifying Flywheel Bearing Service   4. Advanced Flywheel Bearing Servicing Related blog post:  SB20 - Advanced Flywheel Bearing Servicing 5. Flywheel Cog and Axle Bearing Service  Related blog post:  SB20 - Flywheel Cog and Axle Bearing Service 6. Drive Belt Adjustments Related blog post:  SB20 - Drive Belt Adjustments (2025) 7. How to Service the Bottom Bracket Cartridge Related blog post:  SB20 - How to Service the Bottom Bracket Cartridge 8. Replacing the Bottom Bracket Related blog post:  SB20 - Replacing the Bottom Bracket . 9. SB20 Rocker Plate Related blog post: Indoor Bike Improvement #10 - SB20 Rocker Plate See Also Top Ten In...
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SB20 - Drive Belt Replacement

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SB20 drive belts don't break very often.  When they do, installing a new belt is quick and easy. The most difficult task is finding a replacement a belt.  The Stages web site no longer lists drive belts for sale .  Fortunately, standard  Gates Manufacturing  belts fit the SB20. How to Replace Here's the video. SB20 Drive Belt Attributes Here are the attributes of the SB20 drive belt:   Tooth Shape: Curvilinear Tooth Pitch: 8 mm Tooth Count: 200 Pitch Length: 1600 mm (8 mm pitch x 200 teeth) Belt Width: 9 mm Tooth Depth: 4 mm Belt Thickness: 7 mm Orignal Manufacturer: Gates The GT 8 mm tooth pitch means this is a timing belt and not a bicycle belt.  No big deal. Just don't look for bike belts. The Gates catalogue shows no GT belt with 8 mm tooth pitch having a 9 mm belt width . This means the Stages OEM belt was a custom belt. Closest match is a 12 mm wide belt . That's good.  A 12 mm belt fits comfortably in the 20 mm wide Stages driv...
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SB20 - Fixing Broken Shifters

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A concern of many SB20 owners as their bikes age: Shifter buttons become erratic or stop working altogether.    Can the shifters be fixed?  Yes, they can. Who Should do this Work? You should consider doing these repairs if your shifter buttons miss presses, produce double clicks or simply don't work. Difficulty If you are comfortable working with electronics, PCBs, SMDs,  and perhaps like doing watch repairs, you have the necessary skills. I'll suggest the difficultly level for you is 7 out 10 .  If you have never worked on small electronic devices or are uncomfortable working at sub-millimeter precision, the difficulty could be more like 11 out of 10 😳. The good news: Misbehaving shifter buttons can be fixed to work better than new.   The bad news: Doing this work is not for everyone.   ⚡️ Fixing a bad shifter can save an SB20 bike that would otherwise be headed for early retirement. Tools and Supplies Here's what's needed: Electronics ...
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