Cycling Gear Ratio & Speed

Enter your chainring, cassette cog, wheel size, and cadence to see gear ratio and riding speed.

Front chainring (teeth) Rear cog / sprocket (teeth) Wheel + tire size Cadence (RPM)

Gear ratio: —

Development (distance / pedal revolution): —

Speed at cadence: —

What do these numbers mean?

Gear ratio = chainring ÷ rear cog. A higher ratio means more distance per pedal stroke but harder to spin.

Development = gear ratio × wheel circumference. The distance your bike travels per full pedal revolution.

Speed = development × cadence × 60 ÷ 1,000. How fast you move at a given RPM.