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  • Using 72-81" at the mo (48/18-48/16) I'm Leicester based though so different terrain to London. Thought 72" was spinny but may try a smaller gear and see what getting it spinning more is like. Quite like it geared at 81" unless I get slammed with a headwind :-/

  • Might be worth decreasing 1 teeth from the chainring (48/18 is 70.5GI with 25mm tyres) instead of the cog, as the decrease is much smaller.

    47/18 is 69.1GI, and 46/18 is 67.6GI.

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