I took it over to the shop a little bit ago...guy took a quick spin on it after making some adjustments, and agreed that the roughness was there. He said it's nothing he'd be too concerned about, though, and to bring it back in a few more weeks when there's more that needs real adjustment, for my free tune-up. He also suggested that I give the chain a wipe down with a rag...I've ridden it in the rain a few times, and have put oil on the chain after a few wet rides, and I guess I overdid it a little. Maybe that could have something to do with it?