Ya, I'm real happy with those sizes on the 15" rim stock 10 hole. No rubs yet.
I'm guessing that with the 16" pony's if you want the same width 225F 245R you might want to use 50's instead to make up for the extra inch of rim.
Also, with a differant offset from stock (after market wheel) you might be able to go bigger as well but.........
HD