First, I'm looking at some 8.25X15 rims that I really like and want to run 225X50X15 tires, any issues? Second I've been reading about hub centric rings and wondering if they would really do much since I know the Z is "lug centric?" These are going on my stock 75 280, currently running a 7.5X15 rim with no issues. Thanks.

Never mind, I found the answer to the tire question, still not sure on the hub centric stuff.