Gearbag by Gatesnap Labs 4+

BMX Racing Gear Calculator

John Pavlick

    • 5.0 • 3 Ratings
    • Free

iPhone Screenshots


Gearbag is the ultimate gearing calculator for BMX racing!

Gearbag calculates your gear-inches and rollout based on your rim, tire, sprocket, and cog; then shows your gearing, along with other possible sprocket and cog combinations that are incrementally smaller or larger. Now, you can dial your bike in for race day without the guesswork.

Considering picking up a cruiser? Has your child outgrown Expert-sized rims? New tire sponsor? We've got you covered. Gearbag has a "Compare Bikes" mode - enter your current bike, then choose a second rim and tire to calculate equivalent gearing. Spend less time doing algebra, and more time in the winner's circle.


- 32-51T sprocket options with support for decimal gearing
- 12-19T cog options
- Tire options for most major makes and models in 18, 20, OS20, 24, and 26-inch sizes
- Show results in Imperial (English / American / Standard) or Metric
- Supported languages: English, Spanish, French, German

What’s New

Version 1.04

- UI bugfixes

Ratings and Reviews

5.0 out of 5
3 Ratings

3 Ratings

App Privacy

The developer, John Pavlick, 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 Used to Track You

The following data may be used to track you across apps and websites owned by other companies:

  • Identifiers
  • Usage Data

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Identifiers
  • Usage Data

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

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