What PSI do you run in your Nitto Ridge Grapplers 265/17/70 standard load?

Had my tires balanced again to try to correct my steering wheel shimmy and the dealer set the PSI for the tires at 38. The door jam says 32 psi but I’m sure that doesn’t apply to the upgraded all terrain from the factory. What PSI do you all run in your standard load Nitto Ridge Grapplers in the stock 265/70/17 tire size?

edit: excuse my typo in the title regarding the tire size, I realize I got the format wrong and it should be 265/70/17.

 

My door jam specifies 33psi but the shimmy is too annoying so I run mine at 38-40psi.

 

I think I might leave it at 38psi then. It gets up to about 42psi when the tires get hot when it’s 80 degrees out and on the highway but the higher psi seems to help with the steering wheel shimmy. The dealer originally road force balanced the wheels and set the psi at 38 and that got rid of the shimmy but then I lowered the psi down to 32 since it was a more comfortable ride but then the shimmy came back. Now with them back at 38psi the shimmy is gone.

Having the steering wheel shake at the speed I cruise at is so frustrating that I’ll deal with a slight rougher ride and premature tire wear. I was about to roll the dice on a new set of all terrains to get rid of the shimmy so even if these tires wear out premature I’ll be happy to replace them. Currently have 14k miles on them.

 

SL in stock size, I'd run what the door sticker says. I'm running an LT so I've done the math and I run them at 43psi since that gives the equivalent carrying capacity of the stock size and rating at the pressure noted on the door sticker. They wear even. When I go up in size, I'll recalculate.

You might not have an issue at 38psi or you might wear the centers because they're overinflated (whether 5-6psi over is enough to have that effect, I'm not sure).

 

Any tire in the stock size and load range can be run at 32. Some people will adjust for personal preference, but it's not necessarily a good idea.

Tires of different size and/or load range can be adjusted accordingly. Also, some folks don't even bother with charts or calculators and use a chalk test to find their preferred air pressure.

If you have steering wheel shimmy, your tires probably aren't really balanced. I'm not sure why it is, but some places just can't seem to get them perfect.

 

I run mine at 34psi. Rides smooth at all speeds. You might want to get your tires balanced again.

 

Edit -
Ohh shoot...!! Just noticed the thread is about Ridge Grapplers. Pls ignore my comment since mine was Terra Grapplers.

 

I run 38psi on my 265 Ridge Grapplers. For the first 500 to 750 miles or so I had slight wander/shimmy issues, but after raising to 38psi and getting a few hundred miles on them, no perceived issues now.

 

Mine is just shy of a year old with just 3500 miles. Day I drove it off the lot was perfect, after 2k miles is when shimmy started and I always run at 34-35psi. This truck never grazed curb or hit pot holes, I don’t even drive it when it’s raining. It’s just the way Grapplers (most AT tires) are, few thousand miles in and it’s not the same as new.

Running at 38 seems to be good balance between tire wear and comfort.

 

Mine is almost 5 years old, with 107,000 miles.

My KO2's never shimmied in 28,000 miles, and my Toyos and Yokohamas don't either, except when they have been out of balance. I'm probably over 40,000 on the Toyos, and 30,000 on the Yokohamas.

Edit: I also drive the shit out out of it, and off-road regularly.

Some shops just can't balance tires. I lost some wheel weights on the Toyos once, and took it to a popular chain to get rebalanced. Still had a shimmy. Took it to an off-road shop, and zero shimmy.

 

Standard pressure for tires close to or the same size.

 

Maybe Ridge Grapplers are not made perfectly round? I have Michelin Premier (LT tires) on my 22' Frontier with 23k+ miles and it's still quiet and not the slightest vibration on the wheel...

I do drive my 4R once a week for 20-30 miles, don't think it's a flat spot.

 

Could be the tires. Have you tried a road-force balance? Some people get better results finding a shop that does that.

They're very sensitive to out of balance tires, and there doesn't seem to be any real explanation why. I did have a slight shimmy with the original tires, but I didn't have them long enough to try rebalancing.

 

5.5 years and no issues with the Nitto RG’s. Run at 36 psi.

 

Are they E load tires or P rated standard load tires?

 

E load, sorry I forgot this thread was for P load.