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Great ideas above re calculating actual circumference via wheel travel (toothpaste!)...I just used a marker placed based on valve stem, rolled out one revolution (valve stem returns to 6 o'clock) and got 2209mm (it is a new single speed 650B/27.5" MTB). Unfortunately my CPU did not afford a manual entry so I used this table: ...


If you can enter a custom size you can measure your wheel using: Measure you diameter (typically in centimeters). Diameter * 3.1415 = custom size to enter. Another method would be to mark the ground and tire with chalk where the tire hits, roll the bike forward and mark where it hits again. Then measure between the two marks.

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