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Thread: Bolt size

  1. #1
    Senior Member wtgrantham's Avatar
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    Bolt size

    Is the bolt size to bolt fenders or a rack to dropout eyelets a standard size? If so what is it? The bike I am trying to put a rack on is French, will that make a difference?

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    There's no absolute standard, but something like 99% have metric 5x.8 threads, the same as water bottle bosses.
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    Quote Originally Posted by FBinNY View Post
    There's no absolute standard, but something like 99% have metric 5x.8 threads, the same as water bottle bosses.
    It's best to check, though; I've got 2 old Schwinns that use M6X1

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    99.999% of the bikes i've seen are m5, with the remaining .0001% m6.
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