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  1. #1
    fan of maple syrup
    Reputation: nuclear_powered's Avatar
    Join Date
    Apr 2007

    Which 180mm front brake adaptor?

    I am putting an SLX brake caliper on my post mount fork, with a 180mm rotor (shimano RT-76 6-bolt).

    My rotors haven't arrived yet, but I was going to mount up the calipers so I could cut the hoses to length.

    So I started tracking down adaptors and found one of these at the LBS:

    This ^ one has the code SH-MA90-F180P/P. The one I have is SH-MA-F180P/P2. They are identical otherwise.

    LBS mechanic assures me it will work, but just holding everything in place with an old 180mm centrelock rotor it looks way tight, like the rotor may sit too high in the caliper (barely 1mm between outer rotor edge and caliper groove). But ... this is just holding rotor in place - not mounting.

    I have seen reference to another adaptor: SH-MA-F180P/P, which looks like this:

    So which one do I need for everything to interface perfectly? SH-MA-F180P/P? or SH-MA-F180P/P2?
    Last edited by nuclear_powered; 10-26-2011 at 04:18 PM. Reason: added ?

  2. #2
    mtbr member
    Reputation: shanem's Avatar
    Join Date
    Apr 2008
    I've never used SLX brakes but when I was using M975 brakes I ran post mount brakes with a 180 rotor and the adapter looked the second smaller photo in your post

  3. #3
    fan of maple syrup
    Reputation: nuclear_powered's Avatar
    Join Date
    Apr 2007
    Turns out the one I have works fine.

    Just in case anyone digs up this thread in the future.

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