Last updated: 3 October 2026
Reviewed by Jordan Morley, FA Level 2 Football Coach
A bike's gear ratio is the front chainring teeth divided by the rear sprocket teeth — how many wheel rotations you get per pedal stroke. A 50-tooth ring with a 14-tooth cog gives a 3.57:1 ratio. Multiplied by wheel circumference it gives 'development' (distance per pedal revolution). Higher ratios mean more speed per stroke but are harder to push; lower ratios make climbing easier.
- Chainring teeth ÷ sprocket teeth
- Wheel turns per pedal revolution
- Higher = faster but harder to push
- Lower ratios ease climbing
In practice
Understanding gear ratio (front chainring teeth divided by rear cog teeth) helps cyclists choose the right gear for terrain and cadence goals — a low ratio (small chainring, large cog) makes pedaling easier for climbing at the cost of speed, while a high ratio (large chainring, small cog) allows higher speed on flats and descents at the cost of requiring more force per pedal stroke.
FAQ
What gear ratio is best for climbing?
A lower ratio (smaller chainring relative to the rear cog) is preferred for climbing, as it reduces the force needed per pedal stroke, allowing a sustainable cadence even on steep gradients.
Does gear ratio affect cadence?
Yes — for a given speed, a lower gear ratio requires a higher cadence to maintain that speed, while a higher gear ratio allows the same speed at a lower cadence but with more force per stroke.