Bike wheel and fixed gear calculators
Two questions about the wheel itself: how far it rolls in one turn, which is what a bike computer needs, and where a fixed gear wears its rear tire, which depends on the teeth and not on the wheel at all.
Calculators in this section
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Skid patch calculator
How many places on the rear tire a fixed gear skid wears.
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Bike wheel circumference calculator
Wheel circumference and diameter from the size printed on the tire.
Which calculator do I need?
Are you setting up a bike computer or changing tire size? Use the bike wheel circumference calculator for the wheel size setting from the marking on the sidewall.
Do you ride a fixed gear? Use the skid patch calculator to see in how many places the tire wears, for one foot forward or either foot.