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  1. #1
    mtbr member
    Join Date
    Jan 2014

    A little help needed mounting rear p to p adapter for shimano 180 mm rotor

    I got the new rotor and the adapter just a little confused on which direction to mount the adapter. should the larger spacer be on the front or rear post. Thanks! If anyone could post a pic that would really help!

  2. #2
    B A N N E D
    Join Date
    Apr 2007

    The arrow on the adapter always points in the direction that the wheel/rotor spins when you ride the bike.

  3. #3
    mtbr member
    Join Date
    Jul 2004
    Aside from reading that arrow correctly, the reason you put the cone/cup spacer is to allow bolts to sit straight into the brake mount post even with slight angle introduced by your 60-to-80 mm adapter which changes the angle of the brake caliper in relation to your fork/mount. If you, for example, use these spacers between the post and adapter or caliper, then your bolt would sit directly on angular contact surface of the caliper - that can potentially snap/crack the post by applying perpendicular force to the post.

    So, it's very important to follow the direction in this particular instance.

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