BMX Gear Ratio Calculator

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Fine tune your BMX gearing, and experiment with different chainring and sprocket combinations for optimum performance.

This handy and easy to use app enables you to calculate the gear ratio, in standard gear inches, for any given chainring, rear sprocket, and rear wheel and tyre size combinations. It also lets you see which other chainring and sprocket size combinations come closest for all the different chainring sizes listed (20T to 49T), making comparisons of different set ups a piece of cake and giving you valuable insight into the impact of different configurations.