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I would not say it's personal choice, its a matter of safety, as the contact patch should be just right. Tire pressure is a function of load, not tire size. 28/24 is about right on an empty 4Runner with just the driver in it.

 

i set mine by doing the chalk test.

 

factory stickers as your initial guide, chalk test to get specific to your truck's weight. it's all about the weight, not the tire.

 

honestly harder is better for fuel milage softer is better for traction.

I was taught to look at the crown of the tire AKA if the outside edges are off the ground and center is touching also if the center is off the ground and the outsides are touching.

basically at specified on the tire pressure the whole bottom should be touching of course this can be effected by alignment.

I run 40+ better fuel mileage for on road, and 30-35 for off road better traction!

 

Tires also cost money, wear out the center sooner than needed and you end up with a net loss.

If the edge of the tread is off the ground, you are about to blow up the tire!
Tread can be wholly on the ground, yet the tire will still be considered over pressure, as the load will be different across the tread, and wear badly.

 

i run helium

 

Yes it's very possible to run too much air in a tire as others have mentioned. It will cause you to crown your tires not to mention your rig will ride like a tank. I run my tires at 32 in my DD. The difference between 20psi and 40 psi is so small you would have to drive 100,000 miles a year for it to make a lick of difference in your fuel costs.

Eddieleephd your wasting your time trying to wheel at 30-35 that's not going to help you at all. I don't even bother airing down unless I'm going to 12-15. If I'm wheeling a long trail I go right to 12 and let the rocks beat the rest of it out. I've ran my 12.50 wide 37's on an 8" rim all the way down to 5psi and have not popped a bead yet. People get worried about airing way down it's no big deal. I don't think my Runner has had more than 20psi in the tires for the last two years.

 

^x2..

my 37 13.50's hit the trail @ 6-8 psi, no bead locks on a 10" wheel all the time with no problems. about 20 on the highway.

now the ride home isn't great.. man i need on board air :l

 

I hear ya.. I use the little MV-50 compressor. It works pretty good. I get back into the 20's at around 4 minutes a tire. The only way I'd ever go all the way back to 30's for the drive home is if I had CO2. I can't really tell the difference between 20 and 30 anyways unless I'm really loaded with camping gear or something.

 

is it this one? http://www.amazon.com/Industries-MV5.../dp/B000BM8RT8

do you have a tank?


60 bones thats not bad, and i already have a tank hmmmm..

 

if you want to know the right pressure for tires that are not factory equipment, go into discount tire and we have software that calculates it for you. Or can screw around with chalk and stare at marks in your driveway for half an hour while your neighbors think you are crazy.......I guess that an excuse to have a beer? but I would just go to a discount tire and they will punch in some numbers.

 

I ran my Nittos Terragrapplers at 36psi but my Duratracs seem pretty level and the ride is nice at 34psi.

 

35 psi on bfgs works for me, factory spec is 32psi all around