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post #1 of 7 Old 01-24-2010, 07:11 AM Thread Starter
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air pressures

Looking for a happy medium it rides pretty soft at about 35psi and just feels to soft when turning,yesterday I brought it up to about 45psi and rides good on smooth roads but when you hit a bump it feels like the soft top is gonna fly off,I do quite a bit of commuting and running real low air pressures on road worries me,I am running nitto all terra's 275/70/18.

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post #2 of 7 Old 01-24-2010, 02:25 PM
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If you want to get the best life out of the tires do the chalk test. Put a line of chalk across the tread, drive down the road a little in a straight line and look at the chalk. Chalk left at the sides means you are over inflated, chalk left in the middle means you are under inflated. Adjust accordingly until you get about 1/2" or so of chalk left at the edges. That will be the correct tire pressure for your setup.

Running over inflated or under inflated will cause uneven wear on the tires and shorten their life.
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post #3 of 7 Old 01-25-2010, 02:30 PM Thread Starter
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I'm going to try it because they are starting to wear a little uneven,anyone else with RC 2.2 shocks notice when its real cold they ride real stiff,when its warm they ride smooth as hell,now the whole jeep sounds like its gonna shake apart when you hit a bump.Right now i'm lowered my pressures between 35 and 40 psi and its a little better,I think it may be the shocks more than air presssure now.thanks for the info Phil.

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post #4 of 7 Old 01-25-2010, 02:39 PM
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Like Phil said, chalk test. X2

Every rig is going to require slightly different pressure due to variances such as rim width, sidewall stiffness, bolt on add ons, even temperature. So no one is going to be able to tell you what PSI to run and be spot on. I wouldn't be surprised if you come up with a different pressure between front and back.

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post #5 of 7 Old 01-25-2010, 03:00 PM Thread Starter
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That is actually going to be my next experiment,I have been trying some different Psi's every day ,I'm thinking a little softer in back and see what happens.They do it on race ccars to make em drive better why not a jeep,except there more right side and left side.thanks

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post #6 of 7 Old 01-25-2010, 04:34 PM
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Originally Posted by scottrock View Post
I wouldn't be surprised if you come up with a different pressure between front and back.
X2. I run my 35's with about 30 psi up front & about 32-35 psi in the rear- depending on the weight of the cargo- tools/ equip/ gear/etc.

It seems like 45 psi is definitely too high imo.

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post #7 of 7 Old 01-25-2010, 05:04 PM
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I have a RC 4" with 35's and I ran into the same issue about ride quality, I checked my tire pressure and adjusted them a few times and now I'm running about 32. As Phil stated check with the chalk. I have to wait for dry roads for that. But 32 made the ride A LOT better.

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