mine is 620mm is that too big?? i think the average circumference is about 570 for men mine is 620mm is that too big?? i think the average circumference is about 570 for men
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46
31 inches
Because it is difficult to wrap a metre ruler around someone's head.
A circumference is 4
mark the tyre sidewall with chalk at bdc mark the road at the same point roll the tyre ten times mark the road measure and divide by ten gives a good average for the circumference