Bicycle Gear Ratio Calculator
Calculate bicycle gear ratio, development distance, and speed from chainring, cog, and wheel size.
Gear Ratio
2.94
Gear Ratio vs Front Chainring Teeth
Bicycle Gear Ratios
The gear ratio determines how far the bike travels per pedal revolution and directly affects speed and effort.
Formula
Gear Ratio = Front Teeth / Rear Teeth
Development = Gear Ratio x Wheel Circumference
Speed = Development x Cadence x 60 / 1000
Higher ratios (big front, small rear) mean higher speed but more effort. Lower ratios (small front, big rear) are easier for climbing.
Example Calculation
50-tooth chainring, 17-tooth rear cog, 2.1 m wheel, 80 rpm cadence.
- 01Gear ratio = 50 / 17 = 2.94
- 02Development = 2.94 x 2.1 = 6.18 m per pedal turn
- 03Speed = 6.18 x 80 x 60 / 1000 = 29.6 km/h
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