I need help...what are the largest tires I use on the factory 16" wheels on my 2001 Chevrolet Suburban...without lifting the suspension or modifiying the wheel-wells in any way? It is a 1500 with 4WD and Autoride (air shocks). Thx!

The biggest we have ever test fit is a 265/70-16 on at least a 7" wide rim. The base model came standard with a 245/75-16 on a 16X6.5" rim. They pretty much maxed them out with the optional 265/70-16 from the factory. Anything larger and you'll have to have a local shop test fit on the truck with your wheels.