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Old March 13th, 2012, 02:13 PM   #1
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Default tire PSI on street with big tires

I have 25 psi in my 39.5x13r15 IROK bias ply tires and they bounce you everywhere. What do you all run on the street?
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Old March 13th, 2012, 03:10 PM   #2
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Depends on vehicle weight.

On my cj-5 I run 12 to 15 psi for 37" boggers.

My buddies 3/4 ton suburban on 36" swampers runs a little more pressure.
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Old March 13th, 2012, 03:25 PM   #3
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I typically run about 12. But, it's just occasional recreation driving, not DD'ing. If this is your DD, you need to run more air or you will wear them out in no time.
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Old March 13th, 2012, 03:35 PM   #4
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My last set of daily driven bias ply tires on a jeep were ran at 15, I got 30,000 miles out of them.

I wouldn't go much higher than that, jeeps are pretty light
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Old March 13th, 2012, 03:37 PM   #5
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40" radials on a 350 diesel. I keep them about 25 for a nice ride. 60 when towing
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Old March 13th, 2012, 03:37 PM   #6
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I have 25k on them and there wearing nice.
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Old March 13th, 2012, 04:44 PM   #7
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Ha yeah the vehicle would be an important factor.... its my YJ so not much weight. I have them at 20 psi and its a lot better than the 25. I'll go to 15. Also this is not a DD. I do still like to drive it when its nice around town or to the store to pick up stuff. No way I'd be able to drive this 30 miles
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