I have a Full-timer with a Thor Challenger 37GT that I LOVE. It has taken us on an 8,000 mile journey across America with little trouble. We replaced the front tires with slightly larger tires (245/75/22.5 vs 235/80/22.5) and I could definitely feel an improvement in handling side winds and tracking. My rears are original 7yr old Micheliní 235/80/22.5 with 40,000 miles and still look great with virtually no visible dry rot and plenty of tread but I feel like itís time to replace. I am contemplating a 255/70/22.5 for the four rear tires. I am sure they will fit properly on the 7.50 rims with No clearance Issues but kinda concerned about the pros and cons. Any thoughts?
Probably not a problem but-
You can check dual wheel spacing by looking up your rims offset, this is the HDS (Half of the Dual spacing) or measure the distance between the center grooves on your present tires.
My 22.5x7.5 rims offset was 6.44 inches, dual spacing was 12.88 inches