Determining tire circumference

Determine tire circumference (L) by referring to the tire size chart or by measuring the actual circumference of your bicycle tire.

Tire circumference reference table
* The tire size or ETRTO code is indicated on the side of the tire.

Measure actual tire circumference
With tire air pressure adjusted appropriately, apply a load to the bicycle.
Using the valve, etc., as a marker, rotate the tire once and measure the distance traveled along the ground.
When using front wheel for speed measurement
When using rear wheel for speed measurement