Hey all - I was putting together junk bike bits on a curb-find mountain bike the other day, to build a beater, and I came on a problem. This bike has an old rear wheel, but the sprockets are not visually obviously worn. I then whipped a chain of another old junker I had lying around, and, surprise surprise, it slips. Now, remembering that the rear sprockets don't LOOK worn, am I likely to make this better, or worse, with a new chain? I can of course look for both a new chain AND a newer rear wheel, or a new freewheel/cluster, but I'd like to keep it both simple and cheap.