BICYCLE GEAR RATIO
How does a 3x9 compare to a 2x10 or 1x11 drivetrain?
This handy little calculator can tell you that plus many more combinations! Watch this video for an overview or just scroll down to the calculator.
Enter the wheel size, tire size, number of chain rings, number of teeth, select a cassette size (and optionally the individual cogs) and this tool will help you figure out how much easier or harder your gearing will be if you switch it or buy a new bike with different gearing that your current bike. It can also help you identify any duplicate gear combinations you might have.