New answers tagged pedals
It could however be something as simple as the axle has slipped in the rear dropout and one side of the tire is rubbing against the chainstay. Might want to check this first before you embarrass yourself in front of your LBS.
PeteH has implied it, but sounds like something has gone drastically wrong in a bearing somewhere. I'd suggest you remove the chain from the front chainring and try to spin the pedal crank. It should turn easily, with no side-to-side slop. If not, check the rear wheel for the same, it should not feel gritty or notchy, and should not have sideways ...
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