shoota:
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I have heard .... urban legend ? ........ that rotors can go out of round when the lugs are over-tightened ....... so your 'tech' may be to blame - or the person that tightened the rear lugs ..... maybe someone got a little too carried away with the air gun ......
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I have also heard that rotors need to be stored properly or they will be/go out of round .........
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???