big tire PSI
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Joined: Feb 2003
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From: Dallas
big tire PSI
What PSI are yall running on the larger tires? I know on my tires it says max 60 psi.. but what psi will i get the best wear from my tires. For what i paid i want them to last as long as i can!!! thanks yall
Post Fiend
Joined: Dec 2002
Posts: 6,245
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From: IL, USA
big tire PSI
I don't know if this helps, but I have talked to a lot of guys with the Parnelli Jones 38/15.5 on 10" wide rims and they all run around 35 psi in the front and 30 psi in the rears.
You could start there and then do the chalk test to see how it wears.
Hope this helps.
You could start there and then do the chalk test to see how it wears.
Hope this helps.
Post Fiend
Joined: Dec 2002
Posts: 6,245
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From: IL, USA
big tire PSI
A buddy of mine from the local diesel club, who is also a member here, has the 36/14.5R16 PJs on 16x10 M/T Classic II's and if I remember correctly he runs them at 35 front and 30 rear too.
Hope this helps.
Hope this helps.
New User
Joined: Jun 2003
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big tire PSI
Maybe this doesn't relate but I run 55 #'s in my 35" BFG's. I took my truck down to get an alignment and a rotation and the guy said " boy these tires are wearing well what do you have on em 15K or so?" No I have about 45k and I drive the crap out of it and they have a lot of life left in them. With more air in your tires they will flex less creating less heat and will consequently last a lot longer assuming you are not causing a funny wear pattern. It will ride rougher though.
I would run it at what ever the sidewall says is the max allowable air pressure.
The BFG's say 50 is the max by the way.
I would run it at what ever the sidewall says is the max allowable air pressure.
The BFG's say 50 is the max by the way.
Senior User
Joined: Dec 2002
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big tire PSI
I have 38x15.5x16 P.J`s and i am running 38 in front and 30 in the rear with the heavy a*$ diesel engine. I ran a chalk line across the tire and let air out till the chalk wore evenly across the tread. DC is right as the PJ require less air to get the edges of the tire to lay flat. I noticed it wandered a little less when i did this and i think i found the sweet spot. I just had them rebalanced and rotated after 6,000 miles. they seem to be wearing good. One tire did take 13grams of weight to balance it though. she rides pretty smooth. By the way hi Dan!
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Posting Guru
Joined: Oct 2002
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From: Del Rio, Texas USA
big tire PSI
i did alot of experimenting with mine with the chalk when i first got them and i the end found that i get the best balance of tire wear and gas mileage at 35psi F/R, in town, and 40psi F/R on long Freeway trips... i sat down one day with a calculator and figured out that if i was getting 1mpg better with 40psi than 30psi, on my 6000 mile summer road trip i saved more money in gas then i did in tire wear. it is true though to get the entire tread to touch the ground took about 30psi.
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From: Dallas
big tire PSI
I can tell on my tire, just by the wear that the on the biggest lug about 1- 1.5" is not regularly touching the street. From what yall are saying, it seems that this is bad.. should i air down just enough to have it all touching? And also.. how xactly do you do the chalk test? thanks
Post Fiend
Joined: Dec 2002
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From: IL, USA
big tire PSI
To do the chalk test.......Draw a line with chalk across your tire. Try to drive it in a straight line letting the tire rotate a few times to start to wear off the chalk and then get out and see how the chalk is wearing off the tire. If the center of the chalk line is worn off you need to lower the psi....if the outer edges of the line wear more the psi is too low......basically play with the psi until you get the chalk line to wear out evenly across the tread......when you start to get close to where it wears evenly try adjusting 1 psi at a time if you really want to get it perfect.
What PSI are you running them at now??
Hope this helps.
What PSI are you running them at now??
Hope this helps.
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Joined: Jun 2003
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big tire PSI
Originally posted by 02superstroker
hey Sun.. i was looking at that summit diesel exhaust.. how is it?
hey Sun.. i was looking at that summit diesel exhaust.. how is it?