I just switched from a 13-34 tooth freewheel cogset to a 13-22 tooth freewheel cogset and suddenly the guide pulley is rubbing against the disk which protects the chain from going into the spokes and the tension pulley is making some contact with the spokes when I am on the largest sprocket. I've adjusted the B-screw and that doesn't help. The hanger does appear to be very slightly bent, but it seems like even adjusting that wouldn't help. From eyeballing it, it looks like there simply isn't enough room between the largest sprocket and the spokes for the derailleur to get the chain all the way to the 22 tooth sprocket. Right now I have the L-limit set so that I can't hit the lowest gear, but this is kind of a pain.
Why would this suddenly occur with a smaller cogset? Could I need some sort of spacer to move the cogset farther from the spokes?