15Mar/103
Why is my mountain bike chain forcing my pedals to rotate?
My chain moves normally forward, but I can no longer coast down a hill without bruising the backs of my legs. I think the problem is with the rear derailleur because the chain is somehow being obstructed from moving backwards through the guide pulley.
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March 15th, 2010 - 15:17
It’s not the derailleur, It’s the rear hub.
Specifically, the freewheel pawls are not moving either because the spring is frozen or the pawl pivot is frozen.
Lubrication might help, but, unless your time is worth about 20 cents an hour, get a new rear wheel (or a used one from craigslist or ebay). You can get a some used bikes for 20 bucks if all you are looking for is a rear wheel. You can steal a rear wheel too, but that is against the law in most states.
Don’t just get a new hub. If the bike hub is fried, like I think it is, the rims, spokes, and bearings are probably in sad shape.
March 15th, 2010 - 15:27
Bill S has it right, it is the freewheel mechanism of your rear hub that it the culprit. If it uses a Shimano cassette body, it is a simple job to replace the cassette body, and you can overhaul your hub at the same time
March 15th, 2010 - 15:53
The freewheel on the back is locked up and needs replaced. Try moving the pedals backward while the bike is still. Take the rear wheel off and take it the a bike shop so they can replace the freewheel.