Bicycle Gear Calculator

"Designed by a cyclist, Bicycle Gear Calculator is a complete Gear Calculator for your iPhone or iPod Touch.

Evaluate current or potential Gearing Ratios, calculate Gain Ratios, Gear Inches, and Development. Use the Skid Patch Analyzer to visualize and minimize your fixed-gear's tire wear. Explore equivalent gearing configurations that let you reuse parts you already have.

A must have for bike mechanics, bike builders and fixed-gear/single-speed riders!"

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Via: milanofixed.com