Designed by a cyclist, for cyclists, Bike Gears is the premier Bicycle Gear Calculator for the iPhone/iPod Touch.
Building a new bike from scratch? Test out possible configurations and get it right the first time.
Calculate Gear Ratios, Gear Inches, Development and Gain Ratios using your bike's measurements. The app now has over 200 preset tire sizes and also lets you enter your own custom tire size for personalized measurements.
Find equivalent gearing configurations to reuse components you already have, or even to save weight by using smaller gears!
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