I have a 2006 GMC Sierra it currently has 265/70/17 I would like to know what would be the biggest tire size that I could go to without having to make any alterations to the truck, I really want to keep it stock (no lift kits, maybe a leveling kit) and want to keep my 17s really don't want to have to trim any parts of the truck either. Any thoughts or answers email me [email protected]

Short of any wheel changes, the same size would be an optimal fit. Make sure you check you tires pressures frequently. If you can't do it yourself, go to your cars manufacturer dealer and ask them to show you how to read the vehicles tire placard.