This will no doubt sound like a stupid question so let the bashing begin. 2010 Sierra Z71 4WD with stock chrome 18's. Wanting to switch to stock machine finished 20's. First off, does anyone see a problem with running the 20's on a Z71 4WD. I see plenty of non-Z71's running them. Second, I noticed that the 20's are .5 inch wider than the 18's, does anyone know if I would need any spacers for this install?

 

I ran 20" tahoe wheels on my 05 4x4 Silverado for 3 years without any problems. No spacers

 

you can run 20s on that truck no problem just got to find the right tire

 

Tires are more expensive, BFG makes one of the best all-terrains in my opinion, here is my reasoning. I would trade out the 18's for 17's and save some money
LT305/55R20 = $417
LT305/60R18 = $311
LT285/70R17 = $230