biggest all terrain tire size for stock 17" 2006 z71 wheels

 

First off, you need to know the wheel width. Then there's the necessary measurement of the wheelwells.
After all, you don't want your rubber getting shredded away.

 

Try calling a good tire store, they may know. If not try calling or mailing an off road magazine, summint racing, or jc whitney.

 

I don't know if any of the tire manufacturers have anything like this on their websites but American Racing has this cool program that shows you what's available for your ride and how it will look.

http://www.autowaretech3.net/nextwheels/are.htm

It's a great idea. You just punch in what vehicle and it goes from there.

 

To compare tire sizes, here's a good tire size calculator. It will also tell you what wheel width the tire size is suitable for.