# How far is one revolution on an exercise bike

I have an exercise bike with a computer and it looks like 100 revolutions of the pedals is 430 meters, this seems like a lot.

I was wondering if there is a good number for converting pedal revolutions to meters.

I figured that without gearing the average bike wheel is 26" (0.66 M) and so the circumference of the wheel is

0.66 * PI = 2.07 M

In this instance one rev is basically 2 meters. The bike's computer seems to think one rev is 4.3 meters.

I really don't know where they get these numbers from and I am trying to make more accurate measurement of my exercise but the computer on the bike shows made up distance figures, calories etc...

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Even on an un-geared bicycle, I think you would find that one revolution of the pedals isn't the same as one revolution of the tire. That could only be true if the gear on the pedals were exactly the same size as the gear on the wheel, which in my experience the gear on the wheel is always significantly smaller than the gear on the pedals, especially on an "un-geared" bike. – Nathan Wheeler Jul 2 '12 at 15:47