| I am able to run a 255/85 r16 on factory rims with a set of 2" torsion keys and i have yet to make them rub. Problems i am having though include the middles wear faster when aired up properly and availability(most stores dont carry this size). My brother-in-law is running Nitto mud grapplers size 33x12.50 (after market rims) with the 2" keys as well on his 08 but they rub excessively when he turns all the way.
__________________ 2004 Chevy 2500HD EC Short Box w/LB7 ZF-6 speed 
295/75-R16 Hankook M/Ts on aftermarket rims with 2" Lift Front and Rear
Diamond Eye 4" Turbo back. Air Box Mod. AFE Drop-In Filter. CrankitupDiesel Tie Rod Sleeves. Cognito pitman/idler braces.
Autometer Phantom II Boost & Pyro w/overhead console mount. AmsOil Severe Gear Front and Rear Diffs FUTURE UPGRADES
EFI Live w/DSP5
Cognito Upper A-arms
Clutch Upgrades And the list goes on and on |