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Correct air pressure for nitto trails..

Ratt_NC1

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Ratt_NC1 Enthusiast

Ratt_NC1

Posted
Posted

I am running 305/55/20 trail grapplers and need to know the correct air pressure. I have them on 20x10 fuel mavs and for some reason it seems they are riding rough compared to normal. Mileage on them is around 18k. Debating on changing them to Toyo at's after this set maybe that will help with some road noise...?

Abearclaw Enthusiast

Abearclaw

Posted
Posted

Rough compared to stock tires? I had 305/55r20's on my truck before my lift and I always kept the pressure around 35 psi

 

 

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Ratt_NC1 Enthusiast

Ratt_NC1

Posted
  • Author
Posted

No just seems they have gotten worse over time... I guess because of the mileage. Plus the road noise has definitely gotten worse!! They have been properly rotated etc...

snowman44 Enthusiast

snowman44

Posted
Posted

I actually just put on 22 fuel mavericks on Nitto terra grappler g2 285-50-22 and was wondering what air pressure I should run. Guy I bought them from said he has them at 60 that seems way too high for me.

Brandon5799 Enthusiast

Brandon5799

Posted
Posted

I run my 305/55/20 toyo a/t's at 45 psi when they're warm. 10k miles and the wear is great!

Abearclaw Enthusiast

Abearclaw

Posted
Posted

Yeah 60 psi will definitely give you an extra stiff ride. 35-40 has been ideal in my experience

 

 

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      I will admit I haven't experimented much with pressure drops beyond the numbers I put in and part of that is that the numbers I used are fairly low and then found out it would trigger regardless at that 35 psi. Having said that I had tried before had changed the placard pressures and being that I have a 1 ton set to 80 on the placard for the rear I believe it triggered close to 60, the front I don't recall now for sure but thought maybe it could get close to 45 from that factory 60 placard pressure. So I never did figure out if it was a number of psi from placard pressure to the alarm or a percentage of the total placard number as some figured it was like a 25% drop from placard pressure would trigger it. So as to try and answer your question, I believe I set the placard pressure on the front to 47 or so and while I run the front tires at 40, they have dipped below that some if its colder and I haven't put "winter air" in yet and never once have had the front alarm go off. I would say that the answer your looking for is no, that if you set your placard pressure to 45, you have a certain amount of room to drop below that pressure before the alarm will go off.    The pressures you decide to run in your truck, that ends up being what makes sense to you based on what your carrying in your truck or if towing, then have to bump them back up to something that will carry the load in the rear and the fronts typically left at the same pressure. It all comes down to that chart I put the link to and using an accurate roadside scale to be your guide, both unloaded and then loaded to know your minimum safe pressures.    I just wish GM would allow a person to change the readings for the tire pressures to the English system of pounds as I have to look at that goofy metric reading that will never ever jive in my head and will go over and change it just to figure out what they are if need be and then change it back. 
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