I havean overtrail plus coming and plan on putting bigger tires on it. However I plan on using the existing 18” wheels. I was hoping someone had figured out the largest tire that would fit on the wheels and not run at all!
Largest tires on 18” wheels!
- Thread starter Mainelexus
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I haven't tested, but I've been looking and wondering the same thing. Stock tires are 265/70/18 which is right at 32.6 inches. A 275/70/18 would be 33.2 inches, definitely would not be a problem. A 285/70/18 is 33.7, which I still think would work fine. I'm not planning to replace my stock tires until they are worn down, but I'm thinking I might go with the 33.7 inch option when they do. That size is quite a bit heavier than the stock because I can only find it in an LT tire, but I think they would look good and they tend to have deeper starting tread depth.
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I have another vehicle which needs new tires, so these will go on that one, and I will get new tires for the lexus. In northern Maine the dirt roads have a lot of shale and are very very tough on sidewalls. I don't think the lt's would be a bad idea at all
I believe the general consensus is a 285/70r18 or 33.5 inch tire will fit with positive offset wheel. Finding a 33.5” that isn’t at LT tire is hard. If someone know of a non LT 33.5” please chime in. Anyone who has run LT tires knows the ride quality isn’t the best.
My 2021 ford tremor has 275/70r18 general grappler atx’s and they are phenomenal. But that’s a lot of money to shell out for roughly 1/2 inch bigger tire.
My 2021 ford tremor has 275/70r18 general grappler atx’s and they are phenomenal. But that’s a lot of money to shell out for roughly 1/2 inch bigger tire.
Those are very interesting. My only concern is they are 68lbs, 15 lbs more than the stock at3. Total weight of the tire/wheel is something personally I’m going to take into consideration with new tires.
Yeah, I
I almost always go with the biggest possible tires on my vehicles. I drove my 2010 Tundra from the dealership to discount tire and had them put bigger tires immediately. But the tundra has so much low end power that even with 34.5" Nitto Ridge Grapplers, I can turn them over pretty easily on dry pavement. In the GX, the power isn't off the line, it's a little into the RPMs, and I like the performance with the stock tires. I really like the look of the bigger meats, but I also like the quiet smooth ride and passing ability I currently have.
My local off road shop that has an OT told me a couple things, and I trust them.
Comments above are correct that the OT stock tire is basically a passenger car version of an AT tire with less tread so that Lexus can show better gas milage / emissions. Going to an AT tire you are getting deeper tread and a meater looking tire if even at the same size as stock.
- They put 35's on theirs but with a +35 offset and had to remove plastic pieces (clipped in) in the front and back of the front wheel wells as well as pinning the liner a little bit forward
- 285/70/18 (34's) will fit on stock 18's just make sure you are buying a tire that's rated for the 7.5 inch rim. You won't have to move the liner but you will have to remove the two plastic pieces, and a 1" spacer
Comments above are correct that the OT stock tire is basically a passenger car version of an AT tire with less tread so that Lexus can show better gas milage / emissions. Going to an AT tire you are getting deeper tread and a meater looking tire if even at the same size as stock.
If you plan on going on gravel or rock roads the LT tire is safer sidewall strength. The extra weight will only affect the shock absorber performance I would think. Mud flaps too. P rated tires great for any paved roads. Firestone and BF Goodrich Trail T/A look good.
Thank you for all the responses..I’ve had the same question. I’ve kinda got myself mixed up with all of this. 
I’m probably going to move to the 275/70/18 size on the stock OverTrail wheel, likely after this summer. Trying to limit impact to current ride, tire noise and mpg of the stock Toyo. So will go a little heavier, gain a tad of height and width which I welcome. Also once I set up my RV trailer hitch for proper height and leveling this spring, I don’t want to have to change it again going to a much taller tire.
I do like the OEM Toyo quiet ride, apparent softness, good steering and very good traction I’ve experienced on snow and ice. I’m wondering..but will never know what changes Toyo made to that tire for Lexus such as internal construction, plys, belts, materials etc.
Like many I have concerns of the OEM tires being reliable over rocky roads far from home. So that’s part of my reasoning to change out to a more “standard” AT tire.
Related question: I think I saw on another thread that the biggest spare tire which still fits underneath is the 275/70/18; has anyone already done that?
TIA to all.
I’m probably going to move to the 275/70/18 size on the stock OverTrail wheel, likely after this summer. Trying to limit impact to current ride, tire noise and mpg of the stock Toyo. So will go a little heavier, gain a tad of height and width which I welcome. Also once I set up my RV trailer hitch for proper height and leveling this spring, I don’t want to have to change it again going to a much taller tire.
I do like the OEM Toyo quiet ride, apparent softness, good steering and very good traction I’ve experienced on snow and ice. I’m wondering..but will never know what changes Toyo made to that tire for Lexus such as internal construction, plys, belts, materials etc.
Like many I have concerns of the OEM tires being reliable over rocky roads far from home. So that’s part of my reasoning to change out to a more “standard” AT tire.
Related question: I think I saw on another thread that the biggest spare tire which still fits underneath is the 275/70/18; has anyone already done that?
TIA to all.
Yes, the spare is a big limiting factor. I won't drive any 4 wheel drive with a smaller spare. I wonder how the 2025 OT with the factory 1" lift will affect tire size.
Assuming 275/70/18 fits in the spare well, which I’ve seen posted in this forum somewhere that it does, has anyone considered the Toyo Open Country A/T 3 EV? They come in that size and so far, are the only 275/70 tire I can find that is standard load rated (116H). It weighs 48 lbs. and the warranty for the SL version is 65k miles.
I’m also curious how much further the 275/17 sticks out. Is there risk of flinging rocks all over the side of the truck? Maybe the mud guards would negate that.
I’m also curious how much further the 275/17 sticks out. Is there risk of flinging rocks all over the side of the truck? Maybe the mud guards would negate that.
There is no poke with either 275/70R18 or 275/70R17. Both fit in the spare location. Basically, 275 is the largest tire you can fit in the spare and not require any modification. You can check out the Land Cruiser forum for more details. Look in the Nitto Grappler G3 thread.
According to the Toyo website, the 265/70/18 inflated width is 10.7 inches, while the 275/70/18 is 11.0 inches. That is .3 inches total, or .15 inches on each side. I think we'll be safe from rocks being kicked up with that slight of a width change.
Open Country A/T III | The All-Terrain Tires for Trucks, SUVs and CUVs
The Open Country A/T III has exceptional wet and dry braking and handling, great off-road traction, a quiet ride, great in snow and 127 sizes.
So what modifications would need to be made for a 285/70/18 to fit the spare location? That is what I'd really like to run.
You may need 1" spacer to fit according to Westcott. There are some who say it fits without any modification. Maybe the mud guards will need to be removed. I'm thinking about getting this size as opposed to the 275 version.
This picture indicates the tire fits without any rubbing.
i have 275/65/20 and it just fits in the spare location at 33". Not sure what can be done to fit another .7 inches. Maybe deflating the tire and squeezing it in. Believe it is the hitch and a cross brace of the frame that are the limiting factors
Not my car but owner claimed it didn’t rub with street driving. Stock suspension
Jorge talked about this size in this thread, 35s Fit! KO3 285/75 R18. Basically, you would need to remove the crash bars for it not to rub. ICON fitment video mentioned this as well.
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