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  1. #1
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    160mm to 203mm Brake Rotor swap

    I have a Specialized Enduro 29er and am currently running a 203mm rotor on the front and a 180mm rotor on the back. I realized I have a spare 203mm rotor so I was planning on sticking it on the rear to replace the 180mm. I guess the frame is naturally built for a 160mm rotor so to get the 180mm on it there is a brake adapter.

    So before installing the 203mm rotor I bought the 203mm Shimano adapter - I tried to install the 203mm adapter, only to realize that the adapter is only meant to upgrade from 180mm to 203mm (not 160mm to 203mm). I tried double stacking the 180mm adapter and 203mm adapter, which probably would have worked but the screws weren't long enough to accomodate this.

    What is the proper way to put a 203mm rotor on a 160mm frame? Any help is much appreciated.

  2. #2
    SS Pusher Man
    Reputation: mtnbikej's Avatar
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    sounds like you bought the wrong adapter.
    I resolve to constantly assert my honest opinion on anything and everything - whether it is requested or not.
    Bucky the Cat

  3. #3
    Out spokin'
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    Quote Originally Posted by mtnbikej View Post
    sounds like you bought the wrong adapter.
    This made your post count go up by one.
    =sParty
    disciplesofdirt.org

    We don't quit riding because we get old.
    We get old because we quit riding.

  4. #4
    B A N N E D
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    160mm to 203mm = SM-MA-F203P/P
    180mm to 203mm = SM-MA-F203P/PM

  5. #5
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    the shimano adapter SM-MA-F203P/PM doesn't work with some brakes like hope e4. I found out the hard way.

  6. #6
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    Well of course. The shape of the adapter is designed around the shape of the caliper.

    Not surprisingly, hope has their own adapters: http://www.chainreactioncycles.com/m...r/rp-prod13728
    Quote Originally Posted by givemefive View Post
    the shimano adapter SM-MA-F203P/PM doesn't work with some brakes like hope e4. I found out the hard way.
    Sent from my XT1635-01 using Tapatalk

  7. #7
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    Frames have a maximum supported rotor size, the jump from 160 to 203 sounds like it might snap your chainstay in half under hard braking. Make sure your bike supports 203mm first.

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