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Old 08-09-18, 09:13 AM
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Join Date: Dec 2014
Location: Boise, ID
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Bikes: S-Works Venge Dura-Ace DI2, KTM Strada 4000, Fuji Norcom Straight 1.3 (TT), Fuji Track Elite, BMC Trackmachine TR02

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Originally Posted by queerpunk View Post
FYI you are using accurate but non-standard calculation to come up with your gear inches. Most people do 27 * chainring/cog. You're using 26.X, which is the true diameter of the wheel. But most people use 27 as the multiplier, and call a 51x15 a 91.8" gear, a 48/14 a 92.5, etc.

I think low 90s is the right zone for a Cat 3. 51-15 or 48-14.
Cool, thanks! btw, I am getting my calculations from the the BikeGear app. I'm plugging in the chainring and cog sizes, crank length of 165, and tire size of 700x20.
Android: ???

Know of an app that uses the calculation that you reference above?
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