Winner of the Apple WWDC22 SSC
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--- and 5000+ users worldwide ---
Derailleur lets cyclists quickly and easily estimate their speed at different cadences depending on their bicycle setups. Designed to be the best and easiest-to-use app for calculating gear ratios and skid patches, Derailleur combines precise calculations with an intuitive design, so that changing a bicycle setup is quick and simple.
• Find your cadence sweet spot — The gear ratio on a bicycle can be optimized for different terrain, riding styles and fitness levels.
• Extend the lifespan of your tyres — Fixed gear cyclists will benefit from spreading their skid patches evenly around the rear tyre.
All calculations provided are merely for educational and informational purposes. It is not a substitute for professional advice from your local bike shop.