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  1. #1
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    Magura Mt8 on Stumpjumper HT

    I am buying a set of MT8's for my Stumpjumper 29er HT. It's a 2012. Am I going to need a QM 12 IS adapter for these?
    Last edited by Alexgonzalezmi; 01-17-2012 at 06:36 PM.

  2. #2
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    MT8s are post mount so they should bolt onto the frame with a QM 6 post adapter-for a 160 mm rear rotor. The Qm 12 post mount I used for the post mount fork-Reba RL-with a 180mm rotor

  3. #3
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    So if I do both rotors in 160 should I get 2 QM 6 adapters? I also have a Reba RL fork.

  4. #4
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    Quote Originally Posted by Alexgonzalezmi View Post
    So if I do both rotors in 160 should I get 2 QM 6 adapters? I also have a Reba RL fork.
    If you want to run 160mm rotor up front and you have a post mount front fork, the caliper will bolt directly to the fork.

    If you have an IS rear mount on your frame and you want to run a 160mm rotor, you would need the QM-12 adapter for the rear. If you have a post mount rear, the caliper will bolt directly to the frame.

    The QM-6 adapter is for running a 180mm rotor on a post mount front fork.

  5. #5
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    Perfect, I guess I don't need anything then. Thanks!

  6. #6
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    Quote Originally Posted by ncfisherman View Post
    If you want to run 160mm rotor up front and you have a post mount front fork, the caliper will bolt directly to the fork.

    If you have an IS rear mount on your frame and you want to run a 160mm rotor, you would need the QM-12 adapter for the rear. If you have a post mount rear, the caliper will bolt directly to the frame.

    The QM-6 adapter is for running a 180mm rotor on a post mount front fork.
    If I did my homework/research properly, the 2012 SJ HT 29er frames (carbon and M5 alloy) have rear PM for 140mm rotors. Therefore, you will need an adapter to use a 160mm rotor on the rear brake...

  7. #7
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    My bike came with 160mm rotors but there are spacers under the calipers.

  8. #8
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    How are these brakes shaping up for you? I have a stumpjumper HT Evo m5 alloy. I want to dump the avids and get a longer term (non-noisy) solution. Any feedback is appreciated!

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