Tire Pressure Yokohama 31x10.5 R15

David Jackman

David Jackman

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2004 Wrangler X with Yokohama Geolander A/T-S 31X10.5 R15 LT; what is the proper air pressure to run in the tires? We don't do off road, at least on purpose, and sometimes but rarely pull a motorcycle trailer with less that 2000 lbs total weight. Thanks in advance for the help.

Chief
 
I run mine at 28 psi front and 28 psi rear. Anything over that and it will ride way too stiff!
 
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Rob5589 said:
Not Yoko's but I run 28 in my 31's.
Click to expand...
Thanks. I put 30 in mine after reading some other posts. I don't drive it every day, so it's hard to get a handle on where the "sweet spot" is.
Now....for the next puzzle. So there I wuz.......I bought the Jeep last August in Colorado Springs and drove it back to Canyon Lake, Texas. I did not check the air in the spare tire, which hangs off back end. Well, today I got around to checking all the tires again and discovered the spare was flat. Plumb flat. So I aired it up to 30 psi and went back to other chores. After a while I needed to put something in the back of the Jeep. When I pulled the latch, it sprang open like had jet assist. Didn't pay much attention to it. When I got ready to close the tailgate, it wouldn't close. After look everywhere my bi-focal's could see, I finally discovered that the spare tire is hitting a "bumper" at the bottom, just under the tailgate door. So, it appears that with the 31'" tire on the back, you can't close the tailgate unless there is NO AIR in the tire. I could not determine what kind of bolt/screw is used to attache the "bumper" to the body. It is not a socket that I own. I almost looks like at bolt/screw with a slot or notch instead of screwdriver slot or a hex head bolt.

Have you, or anyone else out there on the forum experienced this little surprise?

What kind of fastener holds the bumper to the back of the Jeep?

Awaiting direction;

Chief
 
I run that size tire on my TJ, and other than it being a pain in the backsides to get the nuts started, it fits pretty well. Try tightening up the top nuts a little more than the bottom one. Max tourque is 65 ft-lbs. The wheel won't be up solid on the center of the mount at that tourque, but it'll be solid on the rubber stops. The top of the tire will be about a half inch or maybe a little less further in than the bottom. Mine rides nicely that way.
 
David Jackman said:
Thanks. I put 30 in mine after reading some other posts. I don't drive it every day, so it's hard to get a handle on where the "sweet spot" is.
Now....for the next puzzle. So there I wuz.......I bought the Jeep last August in Colorado Springs and drove it back to Canyon Lake, Texas. I did not check the air in the spare tire, which hangs off back end. Well, today I got around to checking all the tires again and discovered the spare was flat. Plumb flat. So I aired it up to 30 psi and went back to other chores. After a while I needed to put something in the back of the Jeep. When I pulled the latch, it sprang open like had jet assist. Didn't pay much attention to it. When I got ready to close the tailgate, it wouldn't close. After look everywhere my bi-focal's could see, I finally discovered that the spare tire is hitting a "bumper" at the bottom, just under the tailgate door. So, it appears that with the 31'" tire on the back, you can't close the tailgate unless there is NO AIR in the tire. I could not determine what kind of bolt/screw is used to attache the "bumper" to the body. It is not a socket that I own. I almost looks like at bolt/screw with a slot or notch instead of screwdriver slot or a hex head bolt.

Have you, or anyone else out there on the forum experienced this little surprise?

What kind of fastener holds the bumper to the back of the Jeep?

Awaiting direction;

Chief
Click to expand...

I know this is a year apart from the time the question was posted but this same thing was happening to mine when I bought it. So I figured it might be a thing for more people too. I think the stock wheel’s backspacing is just too shallow with the extra width of the new 31x10.5 tire. Mine was causing the tailgate to actually gap open at the bottom. The extra tension can’t be good for the hinges latches, any of it. I took the lower bumper, the one under the tailgate, off. At first I ran it like that but it sat in an angle which made me nervous. So I ended up using some spare rubber hose folder in half to double over as a bumber/spacer of sorts where the actual mount is. Seems to work so far, but I plan to reinstall the bumper when I finally get new wheels with appropriate backspace.

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Don Ashcroft: I have looked everywhere but I cannot find the receipt for the items I purchased to solve this problem. I went to Quadratek (sp?) and bought a "spare tire relocation bracket" that mounts directly to your spare tire carrier. That bracken extends the mounting bolts out far enough to allow the tail gate to operate properly. I also bought and installed a bracket that mounts on the carrier to extend the height of the brake light so the brake light would be above the tire. I wish I could find the part numbers, but I can locate them right now. When you visit the Quadratek website, there are several options available. Both pieces cost less than $100, and it solved the problem. Hope this helps.

Chief
 
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Hey thanks @David Jackman
I know exactly what you’re talking about. I’ve seen those on there website too. I’m trying to not have to spend too much on stuff I feel is only going to be temporary until I get my wheels. I did play with getting an mount bracket. They’re like $35-$40. Not too expensive but I don’t think I’ll need it in a month or two (I hope lol).
Glad to hear you found a solution. Cheers!
 
So your tire pressure is general number thrown out there. The only way to really know what YOUR pressure should be is by drawing a line of chalk across the tire and driving a bit. Where the chalk wears tells you if you need to add, or subtract air. That’s for an even wear though. My truck I have 40 rear and 45 front for example. Our Jeeps will probably be the same front and rear because the weight is more evenly distributed. .


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I just purchased 99 Sport with 31 10.50 15’s. (Cooper Discover ATR) Just checked the tire pressure and they were around 36. Set down to 28-29 and holy cow what a difference! Turns like a champ now, no longer feel like I’m going to tip over!
 
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