I just emailed my dealer about putting 265/70r18s on and they said it wouldn't necessarily be denied outright but that it could void the drivetrain warranty. Anybody else ever hear of this or have any opinions? I ordered some bfgs but now thinking I may cancel and order factory size.

 

Magnuson Moss Warranty Act
The Text

 

ditto……

 

Assuming you are in the United States, basically, they cannot void the warranty because you used different tires (and rims), unless they can specifically show that the use of the tires and rims caused the failure/fault which they do not want to cover under warranty. There are also specific things in the law that are by default assumed not to void a warranty, such as changing air filters. Tires might be on the list, but I do not recall.

 

Interesting, so most likely the mildly larger tires won't affect anything but I suppose there is a possibility they could argue a failed transmission or something is from the larger tires?

 

They must show a direct link between your actions and the failure of the part(s) being rejected under warranty claim.

It is highly unlikely that a mild change in tire size will adversely affect the transmission to the point of damage.

Now what I can tell you is that I chose not to install 37” tires on my duramax, staying at 35”, because it is commonly known in that community that anything over 35” adds much greater stress on the power train than staying at 35”. However, the stock duramax tire for MY2015 was close to 32”.

Your desired size change is quite small, significantly less than my example, and IMO would not be cause for concern.

 

To add to this, ]tThere are a bunch of threads here about which tires will fit without lifting the car, and will not rub when turning. I would guess that if you find your tire size successfully used by others, then I imagine they would have a pretty hard time proving that the tires are at fault. Also, If you use a factory rim instead of an aftermarket one, that would help your cause and then they'd have to prove that the tire caused the problem, which seems a bit of a stretch for a relatively small change in size.

In any case, make sure there is no rubbing with the new size or binding when turning, and check if the weight and offset of the new set up is about the same as the old one. You don't want to give them an excuse for fighting it. If the new tire/rim combination were to be (pick a number) lbs. higher, oner could argue that they might have a more legitimate argument that the vehicle suspension was not designed to handle this additional weight.

Which area of the country is the dealer that told you this?

 

So the size is ok, the BFG KO2s fit fine with no rubbing, I think the size difference is only half an inch difference in diameter. The potential problem is the weight. The factory Goodyear tire is 38 pounds and the BFG is 56. I will use the factory rim but the weight is noticable. I live in Phoenix AZ. The dealership has been fantastic in every other way so far. And like I said, they didn't tell me it a claim would be denied outright but he did say photos had to be submitted to Land Rover and not factory sizes tires could cause a problem.

 

How about a compromise and going with the standard size KO2 which (according to Tire Rack is 5 lbs lighter. Still a 13 pound difference but considering the steelies weigh 45 pounds and the alloys in the same size weigh 34 lbs, there's at least 11 pounds tolerance covered from the factory.

Unless you are putting these tires on the steelies, which researching this had made me rethink.

 

Yeah I have the steelies. I may cancel my tire order and order the factory 255, I don't know. I was kind of wanting the E load range tires and slight increase in size but now I'm rethinking it.