new to board wanted to say hi, and ask whats the biggest tire i can get on the factory 20" rims. thanks in advance. also thinkin of going with the rancho quick lift leveling system

 

The stock 275/55/20's are 31.9"

I have 275/60/20 Goodyear Wranglers which are supposedly 33", but only measure 32.6 and have the front leveling kit and wish I had gone bigger.

I would say you could go 305/60/20 which are 34.5 easily, maybe a bit bigger, but hold on to your shorts when you check prices!