notification What would b the biggest tire I can put on a 20 inch rim with no lift on a 2500hd 01 chevy

I'd call your local tire shop as they should know from experience. I have an '07 2500 HD that I put 17" wheels on and a 2" torsion key lift Some online tire/wheel companies said I could but a 285/75/17 on without rubbing, but my friend at the local tire shop said a 265 was the biggest. He was right, in fact they"ll rub a little when I'm backing up & the wheels are turned sharply. The tire shop should know from experience.

Don't go with 20inch wheels unless u want to beat the crap out of your suspension. I'm a certified automotive tech and u will be replacing parts in the suspension . Big wheels are not cool big tires are go with 17 the tires are cheaper .