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  1. #1
    mtbr member
    Reputation: Jon Edwards's Avatar
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    Aug 2004
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    439

    Magura Louise Vibration/resonance?

    We've just fitted a bunch of Maggie Louises to a friends fleet of hire bikes. For some reason they sent out a load of 200mm rear brakes, which are a little overkill (180s were ordered). Any way a couple of the bikes are having issues with vibration under gentle use of the back brake - happens at any speed and really makes the whole frame buzz.

    We can't see anything obviously wrong, all the bolts are tight, pads look fine and pistons appear to be moving evenly. Power is stunning (no surprise there!). It's just kinda unpleasant when the vibration kicks in.

    Any ideas? Wheels are not the most evenly tensioned in the world (the bikes get used in an alpine environment, so take a hammering), but they're not too bad. Only thing I can think of is that the enormous rotor and the very large mount adaptor are flexing slightly, or puting too much leverage on the frame (Cotic Hemlock, which is a 6" travel horst link effort).

    Not sure if the IS mounts have been faced, but they're using adaptors to post calipers anyway, so it shouldn't affect things too much...?

    Thanks,

    Jon

  2. #2
    ...idios...
    Reputation: SteveUK's Avatar
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    Apr 2006
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    5,662
    PM calipers still have to be attached to the IS frame tabs via a mount; so if the tabs are off, it can still cause a caliper to be tilted over the rotor, so that it runs through the pads at an angle. I'd still get the tabs faced as a matter or course.
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