I just started riding my bike again. It's a Trek 800 with suspension fork.
Anyway, I have some sort of a C3 computer on it (very simple, displays time, speed, trip meter and odometer).
The wheel size is set at 2124
I assume this is mm?
In which case I should measure the rolling diameter of my wheel and put that in, in mm?
It's a 26" wheels, so 26 * 254 * 3.14 = what I should enter in mm or does this not include the tyre?