Re: 13.50's or 15.50's?
It's my understanding that 15.5's can put more stress on brakes, suspension, and transmission as there is more tire surface touching the ground, equating to more resistance. I have 38X13.5X20's on mine, and they have been great. Also, keep in mind that no matter what tire width you run, the real key to prevent rubbing is the correct offset of the wheels.
When I spoke with a VERY respectable shop here in Orlando, they made it very clear that 40" tall tires were too big for Chevy based trucks without substantial upgrades, and 15" wide tires would put a lot of stress on certain components.
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White 2005 SUT, Lifted 7.5" via Fabtech/custom work, Fabtech Dirt Logic 2.25 shocks, 40x15.5x22 Toyo's, black 22" Fuel wheels, 4.88 gears, Dynatech long tube headers, Magnaflow exhaust, Air-raid intake, Superchips programmer, Edlebrock panhard bar, Cognito UCA's, Kryptonite tie rods, Cognito pitman/idlar arm gussets, Hotchkis swaybars and trailing arms, Amp Research steps, E&G fender flares, PIAA SMR's, smoked roof lights (bulbs removed), black suede headliner, 13" JL's under seat
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