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  1. #1
    mtbr member
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    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
    g3h6o3
    Reputation: PissedOffCil's Avatar
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    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
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    I love my icetechs. Very stoppy.

  4. #4
    mtbr member
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    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
    staike
    Reputation: staikeinthahood's Avatar
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    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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