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Old 09-05-2012, 11:35 PM   #1
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Why doesn't stock spare fit on stock spare carrier?

My '06 LJ has some Yokohama Geolandars on it right now from the PO, but the spare is still a stock (but well used) 245/75R16 Goodyear MT/R. The bottom bumper (on the tub) pushes the bottom out so the tire torques on the rear gate and pulls the bottom of it away from the tub. The spare fits, but I'm afraid the rear gate will permanently bend from being like that for so long. Any idea why the stock spare (on the stock Moab) would do this? Everything looks fine, but there's no doubt the gate is twisting from the force. Is that just the way it's supposed to be?

My friend's 2004 X isn't like this and he has a 31x10.5-15 hanging off his.

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Old 09-06-2012, 01:44 AM   #2
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Post a pic so when can see what you are talking about

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Old 09-06-2012, 01:49 AM   #3
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Quote:
Originally Posted by Rolf
Post a pic so when can see what you are talking about
It's too subtle to get a pic of, but I'll try.
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Old 09-06-2012, 02:22 AM   #4
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2 Possible issues first tire is too "wide", second guess somewhere down the line someone replaced the rubber block for a different size. I would try trimming the thickness of the block....or replace the tire
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Old 09-06-2012, 04:10 AM   #5
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Like jp2611 says your tyre and rim backspacing setup is not correct. The rubber bumper at the bottom is the stock size. Do you not get rubbing issues on full lock?

I actually had to lengthen all three of mine to make proper contact with the spare. For a quick solution you can space the spare tyre carrier with some washers, stick some washers behin teh spare rim on shorten the spare tyre bumper(s).
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Old 09-06-2012, 07:46 AM   #6
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Is your LJ a Rubicon?
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Old 09-06-2012, 12:02 PM   #7
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Quote:
Originally Posted by Rolf
Like jp2611 says your tyre and rim backspacing setup is not correct. The rubber bumper at the bottom is the stock size. Do you not get rubbing issues on full lock?

I actually had to lengthen all three of mine to make proper contact with the spare. For a quick solution you can space the spare tyre carrier with some washers, stick some washers behin teh spare rim on shorten the spare tyre bumper(s).
How can it not be correct? It's how it came from the factory.
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Old 09-06-2012, 12:03 PM   #8
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Originally Posted by Tonycrd
Is your LJ a Rubicon?
Wait...lemme check my profile. Yep. It's a Rubi.
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Old 09-06-2012, 12:06 PM   #9
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the rubber bumper is supposed to push into the tire.

the result is a lot of the weight of the tire is actually resting on the tub, not the tailgate hinge.

what is the spare tire inflated to?
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Old 09-06-2012, 12:13 PM   #10
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Quote:
Originally Posted by UnlimitedLJ04
the rubber bumper is supposed to push into the tire.

the result is a lot of the weight of the tire is actually resting on the tub, not the tailgate hinge.

what is the spare tire inflated to?
The bumper just pushes on the sidewall. It doesn't seem to take any of the load at all.

I actually checked the spare pressure for the first time yesterday. I was amazed to find it at almost 50 psi. I was excited thinking I had found the issue. I aired it down to 25, but it didn't solve the problem.
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Old 09-06-2012, 12:18 PM   #11
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Quote:
Originally Posted by UnlimitedLJ04
the rubber bumper is supposed to push into the tire.

the result is a lot of the weight of the tire is actually resting on the tub, not the tailgate hinge.

what is the spare tire inflated to?
Wait, you mean it's supposed to actually push into and deform the sidewall? How low does the pressure have to be for that to happen?

Also, I noticed the tub bumper is sloped from top to bottom (low side being on top). Is that normal?
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Old 09-06-2012, 12:19 PM   #12
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Quote:
Originally Posted by malligator

How can it not be correct? It's how it came from the factory.
Can you quote the tyre size.
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Old 09-06-2012, 12:25 PM   #13
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Quote:
Originally Posted by Rolf

Can you quote the tyre size.
Sure. It's in the original post. 245/75R16
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Old 09-06-2012, 12:29 PM   #14
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Quote:
Originally Posted by Rolf View Post
Can you quote the tyre size.
He has it listed in the original post 245/75/16

OP the bumper pressing on the sidewall actually does help with the weight of the tire. it cuts its ability to rotate putting the weight on the shearing force of the bolts. I couldn't tell from the pic but how far away from the tub is the base of the tailgate being pulled?

Don't compare it to your friend's because his wheel may have less backspacing than yours.

Is the spare mounted to the stock Rubi wheels too?
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Old 09-06-2012, 12:33 PM   #15
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Quote:
Originally Posted by malligator View Post
Wait, you mean it's supposed to actually push into and deform the sidewall? How low does the pressure have to be for that to happen?

Also, I noticed the tub bumper is sloped from top to bottom (low side being on top). Is that normal?
yup, it should push into and deform the sidewall slightly. there should be two more rubber bumperettes on the tailgate as well, which will line up with the tire. as long as the pressure is under maybe 32psi it should be fine. you should have to put the tire on the carrier, and tighten the lugs down to compress to the tire onto the rubber bumperettes.

if the bumper is sloped from top to bottom, it's not normal...it should be pretty even & square. is it possible the Jeep has been in a rear-end accident? that will bend the bumper and can deform the tailgate & spare carrier.
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Old 09-06-2012, 12:34 PM   #16
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Quote:
Originally Posted by homebrwd

He has it listed in the original post 245/75/16

OP the bumper pressing on the sidewall actually does help with the weight of the tire. it cuts its ability to rotate putting the weight on the shearing force of the bolts. I couldn't tell from the pic but how far away from the tub is the base of the tailgate being pulled?

Don't compare it to your friend's because his wheel may have less backspacing than yours.

Is the spare mounted to the stock Rubi wheels too?
Yes. Stock Moab. Just like I said in the original post.
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Old 09-06-2012, 12:38 PM   #17
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Quote:
Originally Posted by UnlimitedLJ04
yup, it should push into and deform the sidewall slightly. there should be two more rubber bumperettes on the tailgate as well, which will line up with the tire. as long as the pressure is under maybe 32psi it should be fine. you should have to put the tire on the carrier, and tighten the lugs down to compress to the tire onto the rubber bumperettes.

if the bumper is sloped from top to bottom, it's not normal...it should be pretty even & square. is it possible the Jeep has been in a rear-end accident? that will bend the bumper and can deform the tailgate & spare carrier.
If its been in an accident it's had a great repair job. I can't see any evidence of one. I wonder if the spare's always been overinflated and slowly wore down the tub bumper?
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Old 09-06-2012, 12:42 PM   #18
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I know this sounds stupid, but is the spare hung on the bracket backwards. The backspaceing might have it too close.
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Old 09-07-2012, 10:22 AM   #19
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Well, I took the whole thing apart and couldn't find anything out of the ordinary. Maybe someone did hit the spare from the back and bent the gate a little. Who knows? Who cares? I don't anymore.

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