Bike Gear Ratio Calculator and Charts

What is a gear ratio and gear inches?

Gear Ratios Calculator


Gear Ratios for these gears are:

Colors group similar values. 3+ is green, 2-3, blue, and below 2, red.

Our bike gear calculator will assist you in selecting chainrings and cogs. Many modern bicycles have a variety of gears, so there are many possible bike gear ratios to consider. Choose the range of interest and see which combination is ideal for your cycling habits and circumstances. As a consequence, you will receive tables in gear ratio and inch units instead of speed.

Gear Raito Formula 

gear ratio = (number of teeth in front chainring) / (number of teeth in rear sprocket)

Gear Inches Formula 

gear inches = wheel diameter * (number of teeth in front chainring) / (number of teeth in rear sprocket)


Related: Gear Ratio Calculator

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