Max Tire Size
 

Anyone know the largest size tire that will fit on a stock 2016 Chevy Silverado 2500 HD without any modification? Stock size is 265/60R20

https://www.gm-trucks.com/forums/topic/184876-max-tire-size-on-a-stock-height-2015-2500hd/

tons more threads out there if you google it

Great site for figuring those things out:
https://www.customwheeloffset.com/wheel-offset-gallery?order=&make=Chevrolet&model=Silverado+2500 +HD&year=2016&suspension=Stock&wheel_diameter_from =20&wheel_diameter_to=20&page=1

You don't mention if you will be changing wheels; nor 2WD or 4x4. And some folks have a different definition of "no mods" as in zip-tying the emergency brake cable back, and cranking up torsion bars really isn't an modification, rather just adjustments.

Thanks guys. 4x4 and I'm getting wheels too. Santa is coming to this guys house! I don't really want to crank the torsion bars. Did that years ago on a previous truck and it changed the ride a bit. I'm coming from a 2008 Silverado with a 6" lift. Decided I'm getting too old to jump in/out of a lifted rig so I'm going to keep this one with stock suspension.