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Tire Pressure......3/4 ton with Radials


Jeff Balazs

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that totally depends on your tire manufacture's recommendations for load and speed ..I would start there..your load will provide the biggest factor in pressure...proper inflation in regard to load and speed controls the heat buildup which is a one of the main causes for tire failure..each can report on what they run but each more than not have different tires from different manufacturers and run different roads, loads and driving habits..your installer/retailer should have given you documentation with your purchase...if not...request it...

Edited by Plymouthy Adams
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i typically run 34 to 36 psi in my radials, for both my wife's corolla and for my 4runner (with 30x9.5x15s), mostly to get max fuel mpg and decent tire life. over the last 20 years, i've consistently put about 60K on a set (4) of radials each time, good for about 4 to 5 years of use, especially since i run two sets of tires/wheels with each vehicle (snows/"regulars"). the snows do not get the same mileage, perhaps around 40K per set.

for my dodge, i run about 55 to 60 psi in the fronts, and 60 to 65 in the rear (admittedly bias ply, and 8.25x20s).

Edited by wallytoo
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I run 245 r70 16 on my 3/4 ton 4wd daily with 60 psi all the way around, load range E. Factory recommended was I believe 45 but I get better wear out of the front's with the higher PSI. When it was a full working truck I ran at max load psi cold, I believe, 80 psi. Max load psi on everything else.

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I got sort of a funny story about tire pressure to tell you.

Back in the mid 90's I worked with a fellow named Steve who went out and bought a top of the line Grand Cherokee.

He then signed up for a special Baja driving class at a local community college. About every other weekend the class went out to desert to practice all the off road driving techniques they learned in class. Steve really got into it and for several months it was about all he talked about. The culmination of this class was a week long trip on some of most remote sections of Baja. The highlight was to be a 90+ mile section on a beach on the Pacific side. 90 miles in loose beach sand. This type of driving is usually done with very low air pressure.... 10# -15#. No big deal.....when you get back to firmer going you either ad air from a tank or small compressor.

 

But Steve was smarter than everyone else.....and he had come up with a way to save space and weight in his rig. So off he goes on this expedition. He and about 20 other new off roaders and their instructors. When they arrived at the beach section they found it closed by the Mexican government. They found other sections of road but never did any sand driving.

 

One summer day a few months later Steve was out and about in his rig. It was a hot day and he had the windows rolled up and was running the air conditioning when his "air supply" let go. Yes he had his spare inflated to 125# and it was inside the rig when it let go. I saw him and his truck about a half hour after it happened. How he was not seriously injured is beyond me. It looked like a bomb went off and his pride and joy was a write off. He had forgotten all about his air supply.

 

Jeff

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