Bike Gear Calculator

Find gear inches and development from your gearing.

Chainring teeth

Rear cog teeth

Wheel diameter

Gear inches 96.429

Development 7.695

Formula: gear inches = (chainring ÷ cog) × wheel diameter

Step-by-step with your numbers:

1. Values used:

2. Chainring teeth = 50

3. Rear cog teeth = 14

4. Wheel diameter = 27

6. Gear inches = 96.429

7. Development = 7.695

Did we solve your problem today?

Gear inches let you compare gearing across bikes and wheel sizes.

The math behind it

gear inches = (chainring ÷ cog) × wheel diameter. Development = the distance traveled per pedal revolution.

50/14, 27 in wheel → 96.4 gear inches.

Higher gear inches?

A harder, faster gear (more distance per pedal stroke).