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  1. #1
    mtbr member
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    Sep 2004
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    243

    bolt sizes for IS and post mount

    When mounting IS I've found that the bolt size to mount the caliper is different by about 3mm but on post mount they are the same. Why's that?

  2. #2
    On MTBR hiatus :(
    Reputation: Speedub.Nate's Avatar
    Join Date
    Dec 2003
    Posts
    9,145
    The should all be M6 bolts.

    You may see different lengths according to need.

    IS mounts need to be long enough to engate all the threads in the adapter or caliper, yet not protrude through to interfere with the rotor.

    PM require enough length for proper thread engagement into the fork, plus whatever thickness the calier + adaper might be, without bottoming out before reaching sufficient tightness.
    speedub.nate
    MTBR Hiatus UFN

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