Bicycle Mechanics - Rotor cause of all my problems?
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I bought a used Specialized Hardrock Pro last year and have fallen/banged it on the ground a few times. I've recently noticed that after a little while riding (1-2 miles) the rear wheel is angled toward the left, brake side of the frame, the tire almost rubbing against the chainstay. I usually hop off, undo the quick-release and tighten it a little then squeeze it back. This is making me have to do small RD and brake adjustments each time. The rear disc rotor is a little bent, but very little, maybe 1-2 mm. Is it this or something else? I've been told I have the QR much tighter than needed, could that be it? I don't think it's an issue of cracks or bends in the frame, but I may just be missing it. Thanks in advance.
12-30-06, 11:18 AM
First thing to check is if the rotor is always spinning 'off' by that 1-2mm you speak of. Remove the caliper from the frame and then spin the wheel (Just to make sure the caliper isn't inflicting any forces that would cause the rotor to bend further unpredictably.) If the rotor isn't wobbling back and forth, that isn't the cause of the problem although it might do you some good to reposition the caliper in regards to the rotor.
If the rotor IS wobbling, well you probably should replace it or get it put back into shape (Likely easier just to replace it, at least given my expereince working on them. If it's a brand new rotor I can usually get it pretty decent into shape using the proper Park tool, otherwise things get more interesting.)
Even if it doesn't solve your problem, you'll have the comfort of knowing that your braking will be better as a result.
12-30-06, 04:34 PM
If your are reseating the wheel each time you shouldn't be having to readajust the rear der. I would try replacing the quick release and see if that helps. Your rotor may be warped but I doubt that is your problem.
All your problems?
If only it was that simple...
12-30-06, 07:33 PM
Honestly, it sounds to me like you have a frame alignment issue. You're having problems that you shouldn't be having and you're having to do things that you shouldn't have to do.
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