Join Date: Jun 2005
Bikes: 06 Lemond Reno, 98 GT Timberline mtn.bike
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From your description "Sometimes the sprocket spins but the rear wheel doesn't spin", sounds like you may have a bad freehub. If the cassette was just loose on the freehub, the wheel should still be driven. Check out parktool.com , lots of good repair and maintenance advice there, along with good pics. The freehub can be replaced (or tightened-but if you've been riding it that way, could be damaged). Stop riding the bike until you get it fixed-could lock up at the wrong time.