With a 2.5" leveling kit, what is the largest tire size to put on the truck without having to trim and cut? Truck has 20" rims.

 

Commonly asked question. Answer is the same though, depends on the wheel used. The width, and offset.

You can rub a 35 on a stock wheel or stock spec wheel as long as it isn't wider than 12.5"s. With a wheel thats wider than stock and sticks out more, it will be a tough call.

I have 295/60-20 Trail Grapplers on my 20x9 +18 wheels and with my Rancho Quiklift 2" level ( 2" after settling, was 2.5" ) I rubbed slightly on the cabin side of the wheel well liner due to the Rancho soft spring rate, too flexible. Before this I had 33x12.5/20 Toyo M/Ts and they wouldn't rub a thing.

I put a set of Bora 1.5" wheel spacers on and I have the equivalent of a -18 offset now, rubs badly and cutting will be needed, just haven't done it yet.

 

I plan to put trail grapplers on stock wheels. I don't much about the offset but on the back of the rim it has 20x8.5jx44

 

A 275x65x20 (34x11) or a 285x65x20 (34.5x12) should fit on a leveled 4x4. Watch out running wide tires on the stock 20's due to the deep backspacing...may cause tires to rub on the upper control arm.