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Noise once every revolution

Schwinn 201 makes a thump once during every revolution

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An easy guess would be that your kickstand is loose and pulled outward. This would cause the crank on the drive side to clunk once every revolution. Fold the kickstand up, align it with the chain stay and tighten it again.
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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