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I have a 05 LS crew cab. I'm gonna put fabtech 3" lift with 2-3" body lift with 17x8 and 4.5 BS wheels. Does anyone know what the biggest size tires that will fit without rubbing, cutting or trimming?
 

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It's 2wd, I have no idea if it's a Z85. I'm in Afghanistan at the moment. Haven't looked at the truck in a while. How can I tell if it's Z85?
 

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This is all the Motivation I need to lift my 2wd!!!!!
 

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well changed my mind doing 5" suspension lift, coil spring spacers with 3" spindles and shackles in the rear. will 33x12.50 tire be ok on a 17x8 wheel with 4.5 back space?
 

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You will be better off for sure, but Your biggest challenge will still be the 12.5" width. That's a lot of meat.

Could hit the swaybar, could hit the body mount. Wheel spacers and body mount chopping may still come into play. Lots of guys here run the CST 5" with 33's, see if you can find a build thread for someone with 12.5's and see what they had to do.
 

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well changed my mind doing 5" suspension lift, coil spring spacers with 3" spindles and shackles in the rear. will 33x12.50 tire be ok on a 17x8 wheel with 4.5 back space?
You could fit a 285/70r17(33x11.5) which is what CST recommends for 5 inches of lift. 33x12.50 would fit, but you would have to trim(body mount, lower bumper valence, etc.)

Btw, with 5 inches of lift, just shackles in the rear isn't going to be enough to level it out.
 

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Discussion Starter #12
is there any way I could still use my OEM 15" wheels with cst 5" spindles? if I need to get spacers I can
 

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With stock tire and rims, you don't need spacers. With bigger tire, and oem 15" rims, you will probably need like a 2 inch spacer.
Is it just me that is confused?

You don't need spacers, but you do? Tire size should not matter, right? Isn't it that the spindle is larger than a 15" diameter wheel will clear?

I would not recommend and 11.5, and especially a 12.5" tire on a 7" wheel. A Z85 wheel is only 6.5" wide.

One of my most common recommendations for tire/wheel combinations is to go to the tire manufacturer website. Find the tire you want to purchase then check the allowable wheel specification for the size tire you are after. Then you will know it's the right size, and the wear will be adequate, not premature.
 

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Is it just me that is confused?

You don't need spacers, but you do? Tire size should not matter, right? Isn't it that the spindle is larger than a 15" diameter wheel will clear?

I would not recommend and 11.5, and especially a 12.5" tire on a 7" wheel. A Z85 wheel is only 6.5" wide.

One of my most common recommendations for tire/wheel combinations is to go to the tire manufacturer website. Find the tire you want to purchase then check the allowable wheel specification for the size tire you are after. Then you will know it's the right size, and the wear will be adequate, not premature.

The stock z85 wheel will clear the spindle no matter what tire is on it(I did it until I had my new rims and tires mounted), I ment that with bigger tires, you would need a wheel spacer to not rub.
 

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Okay, that is not true on the Rancho/Skyjacker lifts. The spindles are larger than 15", disallowing the fitment of a 15" wheel over the new spindle.

I wasn't sure if CST was smaller. Thanks for the clarification.
 

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CST doesn't recommend a 15" wheel, but if you go with a low enough backspace, it will push the wheel far enough out that it will clear the spindle. I have some pics on here some where of my truck with stock z85 wheels and tires on it with the lift spindles, they just cleared the spindle by like 1/2" , but the bulge of the tire past the lip of the wheel had it maybe about the same or even less from the upper balljoint.
Again to re-emphasize what others have said the stock z85 wheels are only 6.5" wide and that is far to narrow of a wheel to put any larger tire on. BFG used ot make a 33x9.50x15, but they no longer offer it, it might have been ok on the stock wheels, but I guess we'll never know now.
 
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