Bicycle Gear Calculator
Calculate gear ratios, speed, and development for your bike setup
Drivetrain Setup
Wheel Setup
Results
Speed at 90 RPM
37.4 km/h
(23.3 mph)
Gear Ratio
2.94
Gear Inches
86.8"
Development
693 cm
Wheel Circumference
235.6 cm
Common Gear Combinations
Speed (km/h) at 90 RPM for common chainring/cassette combinations
| Front | 11T | 15T | 19T | 23T | 28T |
|---|---|---|---|---|---|
| 34T | 39.3 | 28.8 | 22.8 | 18.8 | 15.4 |
| 39T | 45.1 | 33.1 | 26.1 | 21.6 | 17.7 |
| 50T | 57.8 | 42.4 | 33.5 | 27.7 | 22.7 |
| 53T | 61.3 | 45.0 | 35.5 | 29.3 | 24.1 |