I bet Somo, based on the tire size comparison, there's almost no difference in terms of diameter with those set-up compared to stock set-up.
So, Ford must have recommended those set-up for the diameter's sake I guess.
During this discussion, I found a hilarious good deal from Tire rack, with the width of 285, I just grabbed those without hesitation.
It was Pirelli and less than 400 bucks for 4.
This shouldn't be a bad set up, right?
If not, maybe I can return them anyway.
The optimal tire width if you're going to not run staggered would be a 300 (which I don't even know if there's one that's made). It's ever so slightly narrower than the rear rim would prefer and ever so slightly wider than the front rims would prefer.
Again, guys, you can stretch or compress a tire wall a great deal and get the tire to mount. I've seen idiots on the street running tires that were nearly 2" too wide for the rim they were on. I've seen the opposite, where the sidewall was so stretched that it looked like a Giraffe trying to get a drink of water.
With truck tires that have a nice healthy sidewall dimension, they're more forgiving/flexible. The angle of the sidewall is less affected when you go narrow or fat. With low profile tires, they're VERY unforgiving, because the sidewall doesn't have enough dimension or meat to adjust very much at all and it creates dangerous angles on the side wall to the wheel and runs the risk that the bead seal fails and the tire blows out.
Combine these issues with
A) Again, back blow out = bad, front blow out = worse. Rolling down the highway at 70 mph, if you're going to have a blow out, you'd hope it's on the rear. Furthermore, the front tires get more lateral and torsional stress due to braking and turning. The rear gets in line stress due to acceleration but as any of you have noticed on your accelerometers, you can brake harder than you can accelerate (and usually do it harsher more often).
B) Stretching or bunching a tire on a wheel for a truck isn't as much of an issue (because of the sidewall capacity noted above) but also because you're not going to be rolling a truck at 140 mph.
Given that the tires are low pro, I would NOT run a 255 tire on a 10.5" FRONT wheel. I would be cautious about running a 285 tire on an 11" rear rim, but I guess it would depend on the sidewall dimension (but rest easier knowing the issue was on the rears). Could they work? Probably. Is it smart/safe? Depends on how hard you pedal/break/wheel the car from that point.
