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My Schwinn High Timber has developed a thump when I pedal under load. The thump occurs when either pedal gets to the bottom. When coasting or pedaling not under load, there is no thump. There is no thump when reverse pedaling. Any suggestions? Thanks

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Sounds like one or both of the crank arms are loose. The crank arms are the aluminum bars about 10 inches long that the pedals are attached to. They are attached to the bottom bracket spindle by way of a square hole that is tapered so as to fit tightly as the nut on the end of the spindle is tightened. You can test this by trying to move the two crank arms in opposing directions. To tighten, you probably have to remove a dust cap to get at the nut. But if you don't have a wrench to fit, this is a 1 minute fix that any bike shop would probably do for you for free. To see this, Google images for --- bottom bracket crank arms --- good luck vote if you found this helpful Al K

Posted on Sep 10, 2010


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