What was stock tire on yours @sgtsandman
? I'm asking because I'm surprised you have rubbing with the 31x10.5R15 because that would be the stock tire for my truck so it shouldn't rub. I mean, stock is 265/75R15, but that is the same as 31x10.5R15 as I see it, maybe plus/minus a tenth inch or something, depending on the exact tire and tread. I'll check sidewall comparison, should be basically the same.
I guess I can check lock/lock each side and see how much room is there to the sidewall, but I should be on pretty sol-d ground with the 31". There is 2" lift compared to base model it looks like to me, I see blocks in back.
I really didn't pay much attention to sidewall's width, that's a good point, I don't want something that rubs. 31" shouldn't....
Seems to be tons of room in the wheel wells right now of course that is with springs not compressed. As to not extending outwards past the fenders, seems to be all kinds of room in back but not lots in front.
Interestingly I measured the 235/75R15's that are on there and they are diameter 27" measuring top to bottom. I believe what's happening there is you have about 1" of "squish", because if I measure from the floor to the center of the hub (front), it's 13", but there's 14" above it. That makes sense because the contact patch is flat. So, tires were say 28.7" new, and have quite a bit of wear, so 28" (unloaded) is about right.
So if I put 31" tire, under weight, it's really 30", I bet. Probably 14-1/2" under the hub center, and 15-1/2" above. So it adds about 1-1/2" height relative to what is on there now, and adds 1" if you were comparing them to new 235/75R15's. Which makes sense, as the 31" are, about, 2" bigger diameter new.
Not sure what that has to do with the price of eggs, I just thought it interesting that the tires don't set round but they would have to be not round otherwise you'd have about zero contact.
At any rate, it would give me some additional clearance to the underbody, which I want, and would look better because there's an awful lot of open space in the wheel wells, and surely would perform better compared to what's on there. If I can find 265/75R15 in a decent tire I'd probably go that route, but you don't see lots of them.