New Jeep owner confused - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 6 Old 09-02-2017, 08:23 AM Thread Starter
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New Jeep owner confused

I just purchased a low mileage used 2015 JK Rubicon. It has 285/70 R17's on the American Racing ATX Wheels. I believe the wheels are 8.5 wide and the BFG Mud Terrain T/A's come out to 32.7 Tall and 11.2 Wide.

Now the confusion. The dealer said it was stock and not listed as having a lift. I was wanting to go bigger tires and trying to figure out the proper lift needed. But everything I read is leading me to believe this already has some kind of lift on it or I could not be running the tire set up I have now.

I looked it over I thought pretty well. But only having 8k miles on it. It all appeared brand new and hardly out of the garage so to speak. I have since been over or rather under it a few more times. I do not see any of the budget boosts. nor does anything look out of the norm. The only other thing is it looks like the shocks are red in color but may have been painted black or possible some kind of undercoating spray?

The tires do not rub. Any help with this would be great. Even if its confirmation that no way I can run those with out a lift. Then next try to figure out what I have and how big a tire I can go.

Thanks
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post #2 of 6 Old 09-04-2017, 09:47 AM
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your tires aren't currently much different than stock. They're a half a inch taller and 1.2 inches wider (which will make more of a difference).
So yes its very likely you don't have a lift.

you can check it out here yourself to see how different sizes compare.
https://tiresize.com/comparison/

Most people say you shouldn't run much larger than what you are currently on stock setup.
you could probably get away with a wider tire but not sure how much taller you could go. Without a lift, you really don't need anything bigger than what you're running now. Technically you could get away with alot taller but you'd have very limited travel which negates the point of having bigger tires.

also keep in mind that what the tire is supposed to measure to and what it actually does once mounted and aired up, are two different things.
my duratrac is supposed to be 34.4 but measures almost exactly 34 inches.

Theres this guy on youtube thats fit 37s on his "stock" JKU. doesn't mean you should or is practical.

Notice the insane lack of room between the front fender and the tire? Yea he has the ground clearance of a 37inch tire but has basically 0 suspension travel.
Keep in mind he did this just to see if he could. He got a lift very quickly afterwards and always planned on a lift from the beginning.
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Last edited by mvjeeper; 09-04-2017 at 09:53 AM.
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post #3 of 6 Old 09-04-2017, 11:11 AM
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The 8.5 wide wheels prolly have the back space to move the tires out, giving them the clearance they need to prevent rubbing hard parts.

I have 315/70-17 Duratracs. Numerically, yes, 34.4"...reality, with 28psi, 33.5".
Also, on stock lift with 8.5 wheels having 4.63" BS.
I do, however, have flat fenders. This tire size will have ripped the OEM fenders off with the first offroad flexing.
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post #4 of 6 Old 09-04-2017, 11:14 AM
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Quote:
Originally Posted by funfred View Post
The 8.5 wide wheels prolly have the back space to move the tires out, giving them the clearance they need to prevent rubbing hard parts.

I have 315/70-17 Duratracs. Numerically, yes, 34.4"...reality, with 28psi, 33.5".
Also, on stock lift with 8.5 wheels having 4.63" BS.
I do, however, have flat fenders. This tire size will have ripped the OEM fenders off with the first offroad flexing.
Do you happen to have one not mounted to a rim yet?

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post #5 of 6 Old 09-05-2017, 06:14 AM
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No, but if you're wondering why the difference in our measured heights, I measured with the weight of vehicle on it. I could measure the spare...it prolly measures 34".
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post #6 of 6 Old 09-05-2017, 11:32 AM
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Quote:
Originally Posted by funfred View Post
No, but if you're wondering why the difference in our measured heights, I measured with the weight of vehicle on it. I could measure the spare...it prolly measures 34".
Spare measures 34 almost exactly. I was hoping someone could measure one not mounted on a rim.

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