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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

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