Gates Carbon Drive is the high-tech belt drive for bicycles, motorcycles, & scooters. This app measures belt tension sonically. Just pluck your belt like a guitar string and use the microphone on your phone to read the vibration frequency. Compare your bicycle belt’s frequency to the included chart to see if you need to adjust the tension. For scooter/motorcycle tension recommendations, compare to your vehicle owner’s manual.

Other available features for bicycles:

Interested in key parameters of your bicycle belt drive like speed ratio or center distance? Want to know what belt lengths or sprocket sizes will fit your bicycle? What about comparing one bike to another to tweak your ratio perfectly? With our calculator, you can stay on top of the perfect setup for your drive.

- Find key parameters of your drive such as speed ratio and center distance.
- Change belt length or sprocket sizes to better suit your riding needs.

What’s New

Version 2.1

- Fixed calculations spinner default values calculations
- Added settings switch to turn off initial video
- Added Unit of measure switch to settings to change Center Distance measure and calculation.
- Improved microphone frequency calculation algorithm

Ratings and Reviews

3.0 out of 5
4 Ratings

4 Ratings

Kdo123 ,


Dark blue text on a dark background is really hard to read.
Should have clear images or short video showing exactly where to hold and how to pluck belt.
Feels like it was designed by engineers and for people who already know what they are doing, not for the first time user.

another-nickname-too ,

Doesn’t work, erratic measurements

Plucking the belt I get anything between 39 and 87 at the same spot. Obviously not a reliable way to measure tension.

Bennnnnyman ,

Interesting but not repeatable.

This is a really interesting idea, and double concept to check the belt tension. Unfortunately, every time I pluck the belt it resonates at a different frequency. I suppose a rule of thumb for testing manually is probably good enough.

App Privacy

The developer, Gates Corporation, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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