GearInch

GearInch is a bicycle gear inch calculator for your phone. Use it to find the cog and chainwheel sizes of your desired gear-inch ratio, or to figure out the gear-inch ratio of components you already have. Features *Input exactly your wheel size! Support for 650c/700c/20\\, 24\\, 26\\ and 29\\(same as 700c) wheel sizes. *Precise calculations! Calculations include tire width. *Mountain and road bike tires supported! Tire width input in both inches and mm for mountain and road bike tires. *Convert in both directions! Input cog and chainwheel sizes to determine their ratio, or see equivalent combinations for an input ratio.