Thread: Tire size conversion help
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Old 09-16-08 | 03:34 PM
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Originally Posted by acuteot
Hi everyone, I'm a newbie biker, and I just bought myself a new computer (even managed to install it with no problems!). I'm trying to figure out what my wheel factor is.

I have a Trek 7.2 FX and it says that I have a wheel size of 700 X 35C. The data point I need to enter is the wheel factor, or the distance in millimeters per one turn of the wheel. Per the instructions, a 700 X 32C has a wheel factor of 2155, so I'm assuming that it will be just a bit higher than that. Any help would be greatly appreciated.
That's about right for a 700C x 32mm. You won't be off by much. If you really want to be accurate, get on the bike, mark the tire with something and ride in a straight line until the mark shows on the pavement. Measure the distance. Perhaps do several tests and average the results. But I'll bet they come out around 2160 +/-0.5
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