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I agree that does sound a bit short for the flat lands.
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Sounds like you need to work on your spinning.
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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.
bluebikerider
IR
edscoble
@deleted
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.