Bike

Understanding Rear Bike Derailleurs – Performance Bike Learning Center

To calculate capacity needed for a given bike, subtract the number of teeth on the smallest cassette or freewheel cog from the number of teeth on the largest cog. Then add that number to the difference between the number of teeth on the largest chainring and the number of teeth on the smallest chainring. Thus:

Needed Capacity = (largest cog – smallest cog) + (largest chainring – smallest chainring)

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