Hey Guys,

Long time lurker but first post here. I had some 305/70R17E Nitto Terra Grapplers given to me as an anniversary gift this weekend ! I had them installed on my 04 SCrew yesterday but I'm confused about what PSI I should be running. I've run load range E tires in the past, but they called for a max PSI of 80. These tires have a max PSI of 65, which I'm assuming is due to them being wider than my previous tires (old tires were 295, new ones are 305).

Is anyone else running a load range E tire with a max PSI of 65 on a SCrew? If so, what PSI works for you?

Here's a pic:

 

I usually run 44 front and 42 rear (cold), if they ride too rough go down a little but not under 40 psi. My 305x55x20's have been wearing great at that psi. Great looking tires you have also!

 

Those tires have a fairly high load carrying ability. 3640lbs at 65psi. I would try 40 and see how they wear. That should be good for anything you would normally see, including carrying a load. If towing heavy, I would bump them up a bit for more sidewall stability, say to 45.

 

Welcome to the Forums!
Here's some info, just some suggestions.
I do not have that same size tire, but I run the 285/75-17 Terra grapplers in load range -E on my 2002 F150. they have a max of 80 PSI and I run the fronts at 45 psi and the rears at 40. I called nitto and spoke to a representative and they recommended 40-47 psi for my application. The rep said the tires would wear faster if ran at a lower pressure. They also suggested that I not go below the vehicle recommended factory pressure of 35 psi.
Some more information, I have performed the "chalk test" on my tires, and ended up with 39 psi in the front tires and 34 psi in the rear for the best results on the chalk test for my truck.
Good luck in your quest for a tire pressure

 

The "chalk test" does not really work for an LT LR E tire. Sidewalls are just too stiff. I would not go below 40 on your tires and the suggested from the factory is ONLY for the same LR and load carrying ability tire. For your LR E it is meaningless and should not be used. That number will be totally different depending upon which tire came on your truck. Also if you carry a load in your truck, I would suggest that you air the rears up especially to at minimum 45.

 

I run mine at 40-45.

- NCSU

 

I'd run 40 all the way around

 

I know this is old but can you please tell me the level size you had to run those 305's. Thanks.

 

I have a 2.5" level and run the 305/55/20 Toyo At II's... 45 psi.

 

No level on my truck. I run my tires at 45 psi as well.

 

I run mine at 40 psi. Seems to be a good compromise of ride comfort and wear.

 

Thanks for your reply. Putting those same tires on those same wheels on my 2004. Yours looks great. A rebel here chasing your seminoles.

 

So the 305's do not rub without leveling it? Putting some on next week same wheels as yours. Thanks