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  • ok 15 and 13 will give me 71 and 82gi with 165 cranks and 23 tyres. i think 71 will be too low, but i know how much of a bitch riding into strong headwind is.

    I find 71 GI about right for cycling pretty much everywhere. I think I average about 17-18 mph on the flat when riding at a comfortable cadence. Though this is a SS not a Fixed.

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