In spite of the latest, greatest power meters and GPS units, tried-and-true calculations like gear inches, metres of development, cadence at speed, and speed at cadence remain invaluable for cyclists of all levels. Whether upgrading a bike, deciding if a new one fits your needs, building a fixie, or determining if it's worth switching to that other chainring in the toolbox before a day in the high mountains, this data will help.

A note about the calculations: VeloCalc includes common measurements for road tires, along with a wider array of tooth counts than one would ever likely need, from enthusiast riders to serious racers. The calculations are the result of a huge amount of trial and error to get the best numbers presented in the simplest way.

VeloCalc was conceived, developed, and designed by Christopher Mullen, an avid cyclist and mobile developer. Any questions or comments are welcome and appreciated. If you like the app, please consider giving it a good review on the App Store–it really helps!

By the way, I'm also the creator of the acclaimed What to Wear Cycling app, and I encourage you to check that out as well! WhatToWearCycling.com

See you on the road!