Originally Posted by teddyfirehouse
Do we know for sure if any larger tire would void the warranty? Even if it's around 3% bigger?
They can't specify replacement parts. Even for tires labeled exactly the same, there are a range of actual measured diameters despite the sidewall label. On top of that, the OEM selection of tires on the same drive train from the factory are fairly different. On top of THAT, there just aren't that many choices of tires that will fit at all.
I think the reality is that without a lift kit, you won't have a choice of something likely to cause debate of the subject.
With a lift, if a lift is a thing one can get done on the renegade, it will not void the warranty on anything other than stuff immediately affected by the lift, wheels, and tires.
A quick example of a few scenarios.
You do a lift with bigger tires, strut spacers, and wheel spacer to get everything to fit. It looks hella cool, but...
a) your air conditioner stops working. They can't deny because your changes have nothing to do with that.
b) your wheel bearings die a very early death. They can and should deny that, because with spacers you changed the offset of your wheels and thus increased stress on the thrust bearings. You might get away with it, but the most likely culprit is your modification of the vehicle, and a denial is justified.
c) You hit a vicious pothole and your suspension mount rips through the body. They'll deny you lift kit or no, because you struck something. Lift kit has nothing to do with the denial, even if the lift kit was designed like crap and exacerbated the situation.
d) The car keeps on overheating. This would depend on the design of the vehicle. Bigger tires can make the tranny and engine work harder. That could lead to overheating, especially if the design of the vehicle uses the radiator to cool the transmission fluid. However, they should perform diagnostics and warn you you will be billed if it is related to the modifications. If they find a bum circuit breaker or fusible link is causing the fan to not cycle properly, that is MUCH more likely to be the culprit and should be warrantied as it has nothing to do with your modifications. Similar if they find a coolant leak that doesn't look to have been caused by the monkeys who installed your kit. If they find something they can argue is the result of faulty work, it's not warrantable, you need to take it up with the hack who damaged your vehicle.
You want a fully intact warranty, don't mess with stuff too much.