How do you determine tire circumference value on a bicycle computer?

Answer:

The best result is what you get if you put the bike on the floor, with the valve pointing straight down, and put a marker there on the floor. Then, while sitting on the bike, roll it forward until the valve is pointing straight down again, put another marker there. Then use a tape measure or a yardstickto determine the distance between the two markers.

First answer by Dabac. Last edit by Dabac. Contributor trust: 483 [recommend contributor recommended]. Question popularity: 1 [recommend question].