Great info, guys. I'm trying to tune in the large cog shifting on my recently acquired 1987 Schwinn Prelude and I'm having trouble keeping it from going off into the spokes versus not shifting at all. So far I've ony played with the cable barrel nut and the travel limit. I'll take a look at the B screw as well but from what y'all are saying I almost think the issue may be chain wear and too much compliance side-to-side. I learned a lot on this thread.