Gear ratio0
Gear inches0
Cycling Gear Ratio Calculator
Compare bike gear ratios so you can understand how chainring and rear cog choices affect climbing, cruising, and cadence.
How to use this calculator
- Enter the front chainring tooth count.
- Enter the rear cog tooth count.
- Compare several gear combinations using the same wheel and rider assumptions.
- Use the result to guide setup discussions, not as a substitute for a test ride.
Example uses
Climbing setup
Compare a smaller front ring or larger rear cog for easier climbing.
Commuter gearing
Check whether a gear feels reasonable for steady road riding.
Drivetrain change
Compare old and new gear combinations before replacing parts.
Helpful notes
- Real ride feel also depends on wheel size, tire size, cadence, terrain, fitness, and bike weight.
- Make sure parts are compatible before changing drivetrain components.
- This is a mechanical planning estimate, not a fitting or safety recommendation.