Thread: Tire size conversion help
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Old 09-16-08 | 04:46 PM
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Bill Kapaun
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From: Mid Willamette Valley, Orygun

Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds. 2019 Giant Explore E+3

Your tire diameter would be 6MM more, so that times PI would be about 19MM more.

I just "lasso" my tire with a string, and measure the string.
Even if you are off by "a few" MM, remember that's in over 2000 units. 20 "parts" off is only 1%, which is far more accurate then your car!
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