• kilgore_trout is this a serious question?
    IMHO the difference of something like 4GI is entirely about preference and personal strength/feeling

    to be fair, if i had a double fixed hub I'd run 17 on one side and 19 on the other, because although the difference is smallish around London it's the difference between spinning out and making it up steeper hills. i suspect the OP is thinking about 18 because it's a compromise between the two but is unsure because of the skid patches? though i'm just speculating.

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