GMC Acadia Forum banner

2008 Acadia tire size

9K views 11 replies 5 participants last post by  teetertotter 
#1 ·
I'm sure this has been touched on before, but I can't seem to find an answer. I have the oem tire size of p255/65r18 and I want to put a lt265/65r18 tire on it. Will it clear the front strut assembly? Has someone actually put a slightly wider tire on this year?
 
#2 · (Edited)
#3 ·
Why LTs? You can't carry anymore weight, that's set by the suspension. You're going to gain more mass and weight, which is going to reduce your around town fuel mileage. The extra material in the sidewall would help if you're rock crawling, but it's going to cause the tire to run hotter and ride worse in normal use. You'll need to find a Tire Guide to set your new air pressures, and you really won't get any benefit, UNLESS you run higher air pressures, then you can abuse the tires a bit more but you'll sacrifice any ride quality you had before.
There are P265/55R18s that would fit (according to other posts) and would serve you better. You still need to sort out the correct air pressure.
 
#4 ·
I've had 2 sets of CUV tires, and now a set of LTs on my car. There's been no observable change in fuel economy with any of them. Ride quality hasn't changed too much, either - each tire brand has been a little different. In fact, the LTs seem to give a more positive road feel due to the stiffer sidewall.
 
#5 · (Edited)
addendum: I've run vehicle recommended air pressure in all these tires. The car rides and handles quite well that way, thank you. There's no apparent need to stray beyond the Acadia's recommended tire pressure unless you want to do that.
 
#6 · (Edited)
addendum 2: The weight difference between a 255/65R18 CUV tire and a 265/65R18 LT tire is negligible (~1-2 pounds).* That should not be an issue for the OP, either.

@maxxhotrodd, your lecture would be OK if the OP was making a huge change in tire/wheel configuration. Your discussion is largely irrelevant to the change proposed. The main concerns for consideration are:

1. Will the tires rub in a locked turn,
2. Will the tires hit the wheel well liner or outer wheel well trim if he hits a bump too hard, and
3. What will the change do to the speedometer reading.

Other posts indicate 1 and 2 are not a concern. The OP can look up tire size charts on his own to see what the new size tire will do with respect to the speedometer. Those charts are easy to find in a 'net search.

*Internet listed shipping weights are all over the place depending on where you look. The above statement is based on a rough average for a variety of tire brands. I found one site which listed the Goodyear Fortera at 17 lbs. (that doesn't seem right!!) and all other CUV tire brands at ~37 pounds.
 
#7 ·
Firestone sells GiTi Tires. Their passenger tires weigh more than LTs. LT Hankooks and some Michelins weigh less than passenger tires. But once you get to 3 ply sidewalls and deeper read depths, the weights go up. Thankfully there's not a lot of difference in tires that will fit on unaltered Acadias. LT air pressures lose 10% of approved carrying weight. So a P255/65R18 and an LT 255/65R18 would have different load capabilities at the same air pressures. The LT would be approved for 10 % LESS. It is a technicality, manufacturers assume the LT will be treated rougher and that the load weights are generally estimated. And no 3 ply tire rides anywhere near as smooth as a 2 ply.
 
#8 ·
Shopping for tea from China and smoking Colorado chilis again, I see. :hilarious:
 
#10 ·
Yep! You're one tired individual. :grin:
 
#11 ·
#12 ·
Good EXAMPLE and did the same on my 06 Mustang. Same with the snow tires, even though having to push more snow with them. There was not that much of a change in tire diameter and would estimate 1MPH difference.
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top