XLC BV-W17, Manual

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2.5 Find out the wheel size
Wheel Circumference
To get the accurate result, the wheel size should be correct. Mark the
symbol on the tire and ride one circle. Then measure the length between
two points to get the circumference. Or the user can also get wheel
circumference by the following equation:
Circumference (mm) = 2 x 3.14 x R (inch) x 2.54 (1 inch = 2.54 cm)
R=Radius in centimeter
The user can refer the “wheel size chart”
on page 21 for the wheel size