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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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You either have a bad bearing in one of your wheels or in your bottom bracket ( where the crank is connected ) It could also be a pit in the bottom bracket where the bearings ride. If this thump occurs about the same spot on your cranking revolutions I would say it is a pit in that bottom bracket. If it were the bearings themselves that were worn the thump would be more random. The first thing to do would be to remove the chain from the crank. Then crank the pedals using your hands and see if you can feel that thump or vibration with your hands. If you feel it there then replace the bottom bracket or get new bearings. If this does not solve your problem then check the wheel bearings. Just take the wheels off and spin them while holding onto the hubs with your hands. If the wheel bearings are bad you should feel a roughness or vibration while spinning them. Since you described this as a thump I would say problem is not your wheels. They would make more of a clicking sound. Good Luck

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