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Old 04-19-19, 05:40 AM
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Join Date: May 2010
Location: Bristol, R. I.
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Bikes: Specialized Secteur, old Peugeot

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I can think of two possibilities off hand. The most likely is uneven spoke tension so that some spokes, being looser, are not contributing to maintaining the rim straight. It pays to check spoke tension on a fairly frequent basis; say every few weeks. The other possibility is that the cups and cones, (the actual surfaces for the ball bearings) have somehow loosened. If you turn the bike upside down, try to jiggle the wheel. If you get a rattle-like motion the cups and cones need to be tightened a bit, say 1/4 turn of the nuts on the axel.
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