Time Trial / Time Trialling / TT

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gbj_tester in reply to @umop3pisdn

Fit the 48, you'll never get under 72" with 49/18 and 700×23C. You need a thin tread 700×20C to just about scrape inside the rollout with 49/18.

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umop3pisdn in reply to @gbj_tester

Really? Sheldon's gear calculator reckons 48x18 with a 23c is only 70.3".

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gbj_tester in reply to @umop3pisdn

That's why we went with the 25C last year. Not sure what algorithm Sheldon used, but just adding twice the tyre width to 622 to get the effective diameter is a common way to get an answer that is wrong.

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