Bicycle Gear Inches Calculator
Gear inches from chainring, cog, and wheel size.
Inputs
Results
Gear inches
79.4
Gear ratio2.94
Development (m)6.34
Gain ratio5.85
Speed (mph)21.3
Speed (km/h)34.2
How to Use This Calculator
- Enter Chainring teeth, Rear cog teeth, and Wheel diameter (in).
- Set Crank length (mm) and Cadence (RPM).
- Review the Gear inches result.
- Use Gear ratio and Development (m) to inform your decision.
Ad Placeholder
Ad Placeholder