Nitto Ridge Grappler 37" Recommended Tire Pressure

[TakHardRock]

Hi everyone, I just got my new Nitto Ridge Grappler 37x12.5x17. I'm currently running 34psi cold right now, Nitto told me to run 25psi for daily driving. What's everyone running? Thank you!

 

[Ddays]

thats probably a good number to try. Google chalk test & try that as well

 

[Mike Pierson]

Yeah, what ddays said, best is to do a chalk test. Regardless though, 34 is way too high. My chalk test was best around 27/28. They hang around 29 to 30 once I’ve been driving a while.

 

[wayoflife]

What those guys said ^^^
I typically run mine at about 28

 

[cozdude]

I run mine at 28 as well but do the chalk test as Ddays mentioned. Will get you the best results for the weight of your jeep

 

[bobfriesenhahn]

All of the chalk test procedures I found said to start at the tire's rated max pressure stated on the side of the tire. Then go down in 3 PSI increments. The max pressure is something like 80 PSI! So maybe in an hour or two of decreasing pressure and driving forward and backward, the pressure should be in the ballpark of where it should be. Seems crazy to me.

 

[OverlanderJK]

All of the chalk test procedures I found said to start at the tire's rated max pressure stated on the side of the tire. Then go down in 3 PSI increments. The max pressure is something like 80 PSI! So maybe in an hour or two of decreasing pressure and driving forward and backward, the pressure should be in the ballpark of where it should be. Seems crazy to me.

Maybe don’t listen to random terrible information on other sites.

 

[bobfriesenhahn]

Maybe don’t listen to random terrible information on other sites.

The only reason why I looked is that it was suggested in this forum to look at other sites.

The instructions were remarkably similar (even while being independently written).

 

[WJCO]

All of the chalk test procedures I found said to start at the tire's rated max pressure stated on the side of the tire. Then go down in 3 PSI increments. The max pressure is something like 80 PSI! So maybe in an hour or two of decreasing pressure and driving forward and backward, the pressure should be in the ballpark of where it should be. Seems crazy to me.

That's the stupidest shit I've ever heard. Was that from a White House press release?

 

[bobfriesenhahn]

That's the stupidest shit I've ever heard. Was that from a White House press release?

Maybe by the Secretary of Transportation.

I just looked at the top 5 in a web search.

If my tires are bigger and stiffer than factory, it seems that there should already be some crown at Jeep's recommended inflation level (37 PSI for my 2-door).

 

[JamesWyatt]

What those guys said ^^^
I typically run mine at about 28

It’s surprising how much better these vehicles handle when the tire is allowed to be in contact the road.

I was an idiot running my 315 E-rated KO2s on my JTM at 38psi for a time, wondering why I was nearly getting blown off the interstate by crosswinds. I mistook twitchy steering for better steering. I had tried going down to 33-ish, but I never thought to go lower. Then finally had a lightbulb moment after doing more research, and I tried going down further until at 28 it became a completely different vehicle.

 

[Steve Williams]

I found it’s of course very weight dependent. With my doors and top off I like 25psi on my Nittos for the pavement. How much air to run on the trail is a whole other discussion And changes with location and type of rock.