I tightened up the chain a bit, using the Sheldon Brown method of "walking" the axle back. That seems to work pretty well. At the tightest, I've got maybe 1/16" without really pulling up too hard. At the loosest, it's about a 1/4" or so. I think this is a little tighter than what I had when I got it. I guess it will also loosen up slightly over a little time.