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  1. #1
    mtbr member
    Join Date
    Apr 2011

    XTR BR-M9000 Race with 160/140 rotors?

    I am building up a new 29er with XTR BR-M9000 Race disc brakes. I would like to use 160 front and 140 rear rotors. Fork and frame are both post mounts. Will this just be a plug and play setup? Or do I need any special adapters or tips and tricks?

  2. #2
    mtbr member
    Reputation: tomacropod's Avatar
    Join Date
    Jul 2004
    Most post mount frames are 160mm or larger (with adaptor) with a few exceptions. Some of the Giant 27.5 bikes, some Specialized.

    - Joel
    Cycling is Serious Business.

  3. #3
    B A N N E D
    Join Date
    Apr 2007
    Rotor size will depend on the post mount specs of the fork and frame.

    Most but not all forks have 160mm post mounts, the brake will bolt directly onto the fork if it has 160mm post mounts.
    If the fork has 180mm post mounts, the smallest rotor that can be used is 180mm.

    Most rear post mounts are 160mm too, but some frames do have 140mm post mounts, what size rear rotor you can use will depend on what size post mounts you have.

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