Sports

Bike Cadence and Speed Calculator

Find speed from cadence and gearing.

Cadence (RPM)

Chainring teeth

Rear cog teeth

Wheel circumference

Calculated Output

Speed 40.5

Speed 25.166

Formula: speed = cadence × (chainring/cog) × circumference × 60 ÷ 1000

Step-by-Step Breakdown

1. Values used:

2. Cadence = 90 RPM

3. Chainring teeth = 50

4. Rear cog teeth = 14

5. Wheel circumference = 2.1

7. Speed = 40.5

8. Speed = 25.166

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The math behind it

speed = cadence × gear ratio × wheel circumference × 60 ÷ 1000 (km/h).

90 RPM, 50/14, 2.1 m → ~40.5 km/h.

Ideal cadence?

Many cyclists target 80–100 RPM.