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The bike is made by Univega and probably has a freewheel. If the pedaling motion still works, I'd guess your freewheel is shot (the thing that the gears are on in the back). You have to remove it with a freewheel remover and put on a new one. This requires a freewheel remover tool and a large wrench or vise, so you might want to take it to a shop and let ...


Sounds to me like classic symptoms of a dirty drivetrain. If your chain is getting slack on top when you stop pedalling or backpedal, then the problem is in your freehub (or freewheel, whichever you have), a dirty freehub will cause all the problems you've listed, even on a brand new bike. When dirt and grit mixed with excess chain oil get gummed up in the ...

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