Whats the biggest size tire you can fit on the rear w/out modifications w/ a 15" wheel? I was thinking 275-60-15..?? Plz post your tire sizes on rear and wheel size too if you would, if they are a bit larger than normal :D

I also have 275/60x15s on Keystone Klassics. If I put too much weight in the bed they tend to rub alittle until I put air in the bags. If my wheels had a little less offset and more backspacing they probably wouldn't.

15x10 Centerlines on mine with 275/50/15's air bags and wagon springs prevent rubbing

245-50-16 on my '78 with no problem.