Determining tire circumference
To determine tire circumference (L) with more accuracy, measure the tire using the method below.
* When using Cateye Cycling™, you can simply select the size indicated on the tire.
Measure actual tire circumference (L)
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
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