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  1. #1
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    What type of Shimano Brake Adapters needed?

    Hey, I am about to get Shimano XT brakes but I don't know what adapters I need.

    I have a 2012 Jamis exile comp
    Jamis Exile Comp Mountain Bike 2012 > Complete Bikes > Mountain Bikes | Jenson USA Online Bike Shop
    The fork specs said 74mm post mount for disc brakes

    Also not sure what size rotors to use, Right now thinking 203 and 180

    Is it possible to run 180/180?

    Thanks for any help and input

  2. #2
    rebmem rbtm
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    Assuming that you're getting one of the later model XT brakes with post mounts and not one of the older model XT brakes with IS mounts.

    180mm adapter for 74mm post mounts on the fork = SM-MA-F180P/P2
    203mm adapter for 74mm post mounts on the fork = SM-MA-F203P/P


    180mm adapter for 51mm IS mounts on the frame = SM-MA-R180P/S
    180mm adapter for 74mm post mounts on the frame = SM-MA-F180P/P2
    Last edited by cobba; 11-13-2013 at 05:25 PM.

  3. #3
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    Thank you so much I really appreciate the help. One more question if you don't mind , How do I know if the rear is post or IS mount?

  4. #4
    rebmem rbtm
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    Post mounts are 74mm, IS mounts are 51mm.
    If the rear mounts on the frame look the same as the fork mounts then the frame has post mounts.

    Disc Brake Mounting Standards

  5. #5
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    Thank you again! I kinda figured it out...I think. I just measured the distance between the bolt holes on the fork and then on the rear. The fork was 74mm and the rear was 51mm. So P/P for the fork and P/S for the rear. Again thank you very much!

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