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Bike Speed Calculator

Formula

The formula to calculate the speed at which you are riding your bike is:

$\text{V} = \pi \cdot (D + (2 \cdot T)) \cdot \left(\frac{CH}{COG}\right) \cdot CA$

Where:

V is your bike speed (mph)
D is the wheel diameter (inches)
T is the tire size (thickness in inches)
CH is the number of teeth in the chain
COG is the number of teeth in the COG
CA is your cadence (RPM)

What is Bike Speed?

Bike speed is defined as the velocity of a bike based on the RPM or cadence of the biker and the bike’s physical characteristics. This measurement helps determine how fast you are riding your bike.

Example Calculation

Example:

Wheel Diameter: 26 inches
Tire Size: 2 inches
Number of Teeth in Chain: 48
Number of Teeth in COG: 16
Cadence: 90 RPM

Step 1: Calculate the bike speed:

$\text{V} = \pi \cdot (26 + (2 \cdot 2)) \cdot \left(\frac{48}{16}\right) \cdot 90 \approx 25434.15 \text{ mph}$