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  • Hmm. Think I'll be on 49x18 and a 23c tyre, with an emergency 48t (which is the same as 71.5'' on my normal cranks).

  • 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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