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Old 06-21-2014, 09:14 AM   #1
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Max Tire Size and Wheel Spacers?

If there is another post, please redirect me.

I am running a 4.5" Rubicon Express Extreme Duty lift with 1' body lift. I just got quadratec moab wheels with 5' backspacing and slapped 315/75/16 Goodyear Duratracs on them. Specs say max tire size for this lift is 33x12.50. My question is, can I run this setup without major rubbing or will I have to run back spacers? I have heard numerous negatives on back spacers, bearing damage, etc...

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Old 06-21-2014, 09:28 AM   #2
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With that wide of tire and 5" backspace, you're probably going to need spacers. I am not a big fan of them but many folks use them with no problem. I would recommend using high quality spacers such as Spidertrax and there are others, and also recommend using blue loc tite on all of the lug nuts, to the hubs and to the wheels. As far as the offset being rough on bearings, it would be no worse and the equivalent offset wheel.

Also, welcome to the forum!

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Old 06-21-2014, 09:42 AM   #3
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^ yup. I've heard the bearing side load (added leverage) argument regarding spacers for years, and have watched folks run them in 1"-2" varieties on track cars with R-compound tires on road courses without any measurable premature bearing wear. I found that heat from brakes were more damaging to bearings than pressure.

You could have picked a better backspace for your tire size choice, but I understand how it goes. The wheels I wanted were only available in a 3.56" backspace, which many will say is below the optimum range by near 1/4". I'm fine with it because I'm sticking to 10.5" wide tires, and my only other choice was a different set of wheels. Spidertraxx are reputable spacers, and the only input I would have on running them is to remove your wheel and re-torque the spacers after 50 miles or so, and to check this periodically. If your wheels are lug-centric be sure to tighten the lug nuts with the wheel off the ground, then torque to spec after you set it back down.
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Old 06-21-2014, 09:48 AM   #4
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Thanks for the quick responses. I am sold on the Wrangler Duratrac and this size is the only one I could find close enough to take up some fender well space. Notice the 32's in my profile pic. I can still take back the tires because I haven't ran them yet. I don't want to stick out past my bushwacker fender flares, will I?
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Old 06-21-2014, 09:53 AM   #5
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The higher the backspace measurement, the further inboard the wheel/tire will sit, the lower the number the further outboard it will sit. You're in the area of rubbing on the sway bar and control arms while turning. Hence the suggestion for spacers.
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Old 06-21-2014, 04:10 PM   #6
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Okay, say the spacer I need is 1.5". If I go with a 285/70/16, would I be okay not to rub? That would be a inch less in diameter and width. I like a stocky stance but I don't want my tires sticking out past my fender flares. The 285/7/16 = 33.1" diameter x 11.2" width. I think this will be my best bet, thoughts?
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Old 06-21-2014, 07:57 PM   #7
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With the 285/70/16 you may get by with the stock BS on the Moab wheels without spacers. I ran 32x11.5x15 BFG ATS on factory 8" wheels (Canyons w/ 5.25" BS) by adding a couple of washers behind the steering stops.
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Old 06-25-2014, 05:50 PM   #8
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I have decided to go with a 295/75/16 in the BFG ATS. I will post pics soon. I am worse than a #%&@* when it comes to making up my mind. After hearing about the cost/maintenance of wheels spacers, bump stops and possible limitations, I have decided to go with a 1.2" smaller diameter tire x 1.3" less of width (which will make up for the wheel spacers= 150.00 after installation) and bump stops (totaling somewhere around 150.00 for installation.

Also, not to self: When installing ORO steering system or any drag link adjustments, make sure to set your steering stabilizer at mid-pull and not max as it will snap the end of it while making moderate turns!
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Old 06-25-2014, 06:48 PM   #9
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Quote:
Originally Posted by elliszation View Post
I have decided to go with a 295/75/16 in the BFG ATS. I will post pics soon. I am worse than a #%&@* when it comes to making up my mind. After hearing about the cost/maintenance of wheels spacers, bump stops and possible limitations, I have decided to go with a 1.2" smaller diameter tire x 1.3" less of width (which will make up for the wheel spacers= 150.00 after installation) and bump stops (totaling somewhere around 150.00 for installation.

Also, not to self: When installing ORO steering system or any drag link adjustments, make sure to set your steering stabilizer at mid-pull and not max as it will snap the end of it while making moderate turns!
285x75x16 will fit on those rims without rubbing the rear spring perch. Another option is 255x85x16. I have experience running both size tires on stock moabs. Two washers behind the steering stops were required.
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Old 06-25-2014, 07:47 PM   #10
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Thank you for the comment. That is very similar to the size of 295/75/17. I plan on cruising up and down the highway too, so I opted to go with the well versed BFG ATS.

I also wanted to take up as much of the fender well as possible to give it that meaty stance.

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