M1AM14SPUR

I just put on Nitto Trail Grappler 35 12.5 1 ya'll 17's and I wanted to see what pressure I should try to run in them? Thank ya'll.

Totallyrad

On a level lot take a piece of sidewalk chalk and rub it across the tread of the tire to make a stripe from inside to outside. Drive in a straight line for aprox 100 feet and look at the line. If the center is more wore off that the middle, let a little air out and repeat. If the edges are more worn than the center, add air and repeat. If the chalk line wears off about the same on the edges and the center you're close. I'd start at about 45-50 psi and work down. If you use this method remember that front and rear pressures will probably be different. Don't start or stop aggressively while using the chalk will be affected.

Kapman02

Lets see a pic of the new shoes!!

Gatorama

What a great way to set up the tire pressure. Thanks Totallyrad. Now, if I can just borrow a piece of sidewalk chalk from the grandkids...

Totallyrad

Good luck with that. This method is just a way to get started. You'll still have to make the fine adjustments.

Lost Lake

You can also call Nitto customer service and get a load index chart. The tires were designed to operate at various pressures according to the load placed on them.

I do not have a Nitto index chart... I had one for my old BFG's and based on my rear axle weight the chart said the rear tires should be at 35psi. That is for a 10 ply range E tire!

Totallyrad's chalk suggestion is an excellent one. That's probably the best way to fine tune your wear pattern. I'd start with the load index chart giving you an idea of pressure, then fine tune it with chalk which will take into consideration your wheel width and any scrub / camber issues.

Definitely put more air in front tires on an unloaded truck. The front axle on my truck is 4600lbs and the rear is 3400lbs.

Shorts

Another is using some powder on the cement driveway. Drive through it. Basically you need some powdered substance to contrast the tire imprint

A really simple way is driving on a caliche road. The tread touching the road will be white. I know this because dad drives with his over-inflated all the time

Oh, for all you people thinking "what is a caliche road?". It is pronounced "ka-lee-chee"...not "ka-li-shay", "ka-lick" or "ka-lich".

Here what a caliche road in TX looks like

madhat

Shale?

Rednax

Go to http://www.barrystiretech.com/ and do some reading. The chalk thing ain't so great. Load versus pressure is the correct way (weigh the truck, axle by axle).