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Thread: rotor trueness?

  1. #1
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    New question here. rotor trueness?

    Hello i had a question last week about a scrape in my rotor, which i was able to sand out, per advice from this column (thanks). My question now is about trueness, while the sanding made it better, it's not perfect. When i lay the rotor on a flat surface to check for trueness, if i push down on the one side, the other raises about 1 to 4 mm. I know this means the rotor is bent but is this enough to cause a slight catching when i spin the rear wheel? Or are my problems somewhere else, the brakes are magura julies. When i spin the rear wheel hard, it goes maybe 4-6 rotations before stopping, making it not terrible but certainly not perfect.

    thanks for the help.

  2. #2
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    Remount the rotor and secure the bolts to their proper torque, then carefully "true" the rotor using a crescent wrench and/or gloved hands, using the caliper as a guide. It doesn't take much effort and the results are obvious.

  3. #3
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    Will do, i guess that should have been obvious to me, thanks.

  4. #4
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    Quote Originally Posted by jm03
    Will do, i guess that should have been obvious to me, thanks.
    I should also add that on my wheel truing stand, I can use one of the "feelers" just like I do on a rim. Actually, it wouldn't be too time consuming to rig something similar up to your frame's stays instead of relying strictly on eyeballing the gap between the pad and the rotor.

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