Tire Size vs. Wheel Width ?

I try to run with the wideset wheel for the tire used. This keeps more tread on the ground and less stress on the tire mounted to the wheel so it doesn’t bulge. A narrower wheel may work but I don’t like it.

The same is also true in reverse. I don’t like to stretch the tires ability to seal against a wide wheel.

Totally agree with your thoughts on that.

245/40's on 9.5 wheels
Section width of the tire is 9.5 inches.
I wanted as much rim as I could get and as far out to the fender as I could get it.
After moving the leafs 1/2 inboard I have 1" on each side of the tires inside the fenders after trimming 1/2 off the inside lip, and 1/2 inch from the rim/tire to the springs.
Probably could have done 255's but didn't want to push my luck.

Of course it took me months of investigation and surfing the tire and wheel places before I felt ready to commit that much money to something I couldn't physically try on the car first, but in the end they fit perfect.:D