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  1. #1
    mtbr member
    Join Date
    Mar 2005

    What rotors for XT 785 brakes?

    Go for the old style RT75S?

    New RT76?

    ORRRR Fancy new Icetech RT86?

    Thanks. 140lb rider. Will see long downhills and all conditions.

  2. #2
    Reputation: PissedOffCil's Avatar
    Join Date
    Oct 2007
    I love the RT76, the spider helps them stay straighter.
    Check out my SportTracks plugins for some training aid software.

  3. #3
    mtbr member
    Reputation: mestapho's Avatar
    Join Date
    Sep 2011
    I love my icetechs. Very stoppy.

  4. #4
    mtbr member
    Reputation: WR304's Avatar
    Join Date
    Jul 2004
    That's actually quite a difficult question to answer. I don't think the information is available to be able to answer it fully. It needs a comparison of the RT-76 and RT-86 brake rotors alongside each other when used with Shimano brakes. This is only my impression of considerations for choosing a particular rotor, rather than the definitive answer.

    If you're doing long mountain descents with sustained periods of dragging the brakes (30 minutes plus descending) then the Shimano RT-76 steel rotors are probably the safest bet. That option avoids any risk of running into possible warping issues with the Ice-Tech rotors. There's a thread on mtbr somewhere where someone had actually damaged their Ice-Tech rotors whilst descending. The forum search is still broken so I couldn't find it again.

    Post #62 onwards discussing Ice-Tech rotors and the German Bike magazine brake tests
    Love the new 2012 XT brakes

    If you're doing shorter descents then the Shimano RT-86 Ice-Tech rotors would probably be a better bet, allowing you to take advantage of the claimed cooling and performance benefit that the aluminium cored rotors offer. I weigh 149lbs approx and my front Shimano RT-86 Ice-Tech rotor appears to perform well without fading. A typical descent is ony in the 2-5 minute range however. I've had issues with the front brake feel firming up and rotor rub after the descent but I think that's related to the brake, rather than the rotor.

  5. #5
    Reputation: staikeinthahood's Avatar
    Join Date
    Oct 2008
    A friends RT76 rotor developed play between the rotor and spider. A RT86 may be better. They're brilliant rotors though.

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