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  • Hornsey, commuting to Mayfair via Crouch End and Kings Cross. Currently, 69.9GI (28 tyres), doesn't give me anything to sprint with on flats and is too spinny on any decline.

  • too spinny on any decline.

    It is a fixed wheel drivetrain after all, I'm on 45/18, and that was just about spinny enough on the descent in Surreys (66GI).

    Stick to the 17t you originally selected, 1t is quite a big jump on the rear.

  • It is a fixed wheel drivetrain after all, I'm on 45/18, and that was just about spinny enough on the descent in Surreys (66GI)

    Are you touching the brake(s) on the descents and do you know what sort of top speeds you're hitting?

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