I have a 05 chevy silverado 4x4 with 265/70/17's on it.?

[Robert R]

How big and small can i go without harming anything?

[jgentis]

Check with your local tire pro they will be glad to help you pick the right tires for your truck!

[JasonG]

I think you can do 31.5x10.5 w/o any kind of lift...body or suspension.