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Old 03-25-2006, 12:43 PM   #1
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Tire Pressure

As you all know I had my 35's put on a couple of weeks ago. Since then I have noticed that they are not wearing very good. I mean that only the middle of the tire is hitting the road instead of the whole thing. I checked the pressure in them and the tire shop had 32 psi in them, so i lowered them to 27 psi and that helped a little. My question is what pressure would you all recommend for my 35's? I mean should I keep letting out 5 psi until I like the way its running or is there a certain pressure I should stay above for highway use? Thanks again everyone!!!

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Old 03-25-2006, 07:03 PM   #2
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The right pressure is the pressure that works for your tire/wheel/driving situation. Shops keep trying to put recommended pressure in my 31's as well. Same problem, I bounce down the highway and only touch the centers.

Heck, the rig weighs what 4000 or less dripping wet?

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Old 03-25-2006, 10:53 PM   #3
coilovers are damn flexy
 
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I am curious, what brand of tire did you put on your Jeep, and are they radial or bias-ply?
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Old 03-25-2006, 11:16 PM   #4
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Well this might sound stupid but I dont know the difference between the two. Could you explain?
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Old 03-26-2006, 10:00 AM   #5
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Markings on the sidewall of the tire will tell you. But a radial has the belts running around the diameter of the tire. Picture a 6-8" wide "belt" running just under the tire's tread.

Bias ply tires run a woven or across the tread pattern, usually at 45 degrees to each other.
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Old 03-26-2006, 11:35 AM   #6
coilovers are damn flexy
 
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Tire class 101

The easiest way to identify a tire is by the size markings on the side wall.

Example:33X12.50R15LT
33 = how tall it is
12.50 = width of tire
R = Radial
15 = rim size
LT = Light Truck

If you don't have the "R" in the tire size, it is not a radial tire.

Also, if you bought Super Swamper tires, most likely they are bias ply.
Bias ply tires will stand straight up with the valve stem removed from the rim, and no air in the tire. A radial will go flat, with no air. That is the biggest noticeable difference between the two, and of course the overall handling on the highway.
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Old 03-26-2006, 03:03 PM   #7
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Well mine are radials. And I let out another 5 psi to see if that helped with the wear. I now have about 22 psi in the tires.
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Old 03-26-2006, 05:51 PM   #8
coilovers are damn flexy
 
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The next thing that will have a large impact on the way your tires hit the ground is the rim width you are using. If you are running 12.50's on a 8" rim, they will not sit squarly on the road, as you have pulled the sidewalls in tighter than if you had mounted them on 10" rims. There are a lot of wheelers that like to mount 12.50's on 8" rims because they can let more air out of the tire when wheeling, and they don't hit the rocks as bad. But they do not let the tire sit squarly on the road. When I bought my tires, the manufacturer recommended that they be put on 10" rims. I did that, and run my tire pressure at 30 lbs. and they are wearing very well.
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Old 03-26-2006, 05:59 PM   #9
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I have 10" rims so I would think they would be alright , I dont know though. I will just have to see.

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