Nitto Ridge Grappler Load Range/Inflation Table

Reply Subscribe

Thread Tools

Search this Thread

Mar 31, 2019 | 08:55 AM

rewillia

Thread Starter

Senior User

Joined: Feb 2019

Posts: 397

Likes: 7

From: SW Louisiana

Nitto Ridge Grappler Load Range/Inflation Table

Any members here know where I can find a Load Range vs. Inflation comparison chart on the Nitto Ridge Grappler 35x12.50r20 F-125Q load range 3420 tires? I want to check on what the load ranges (per tire) will be if I choose to run at a lower pressures than the maximum PSI of 80 of which has been suggested to improve ride quality and something I want to do, (i.e. run around 45 for improved ride quality (can always bump back up as needed if carrying/pulling a load).

Before asking, I tried a few searches to find one (comparison table) with no success.

Cheers!

Mar 31, 2019 | 09:36 AM

ATC_F350

Laughing Gas

Joined: Dec 2018

Posts: 837

Likes: 152

From: NE OK

I can't find one for my tire either, but I did find a formula of max weight/max psi = x. X times your psi = weight rating. With my tires this is 4080/80 = 51. At 60 psi, I would have a 3060 weight rating (60 x 51). This formula is a ballpark number, but in the load charts I've found, the number is always under the actual load charts by a safe margin. So, I'll use this safe ballpark number till I can find the Cooper chart.

Mar 31, 2019 | 10:19 AM

SUPERTRUCKERS

Mountain Pass

Joined: Dec 2018

Posts: 193

Likes: 15

From: Fort Collins

Quote:

Originally Posted by rewillia

Any members here know where I can find a Load Range vs. Inflation comparison chart on the Nitto Ridge Grappler...

If you want, call up Nitto Customer Care and see what they recommend or if they can provide various PSI/load ranges for your specific tire. I had a tough time trying to find PSI info for Terra Grapplers, so I just gave them a call.

Mar 31, 2019 | 11:02 AM

DeputyDiesel

Tuned

Joined: Sep 2016

Posts: 389

Likes: 24

I have the cooper chart. They emailed it to me. I can PM it if you’d like.

Mar 31, 2019 | 11:09 AM

eberlestock

Laughing Gas

Joined: Jul 2012

Posts: 1,210

Likes: 20

From: prince george, bc canada

I run the ridge grapplers on my 2009 F350 which I haul my 3000lb bigfoot camper with. I chose the 35-1250-18 size as they have a huge "F" rating and you can put a crazy 80psi in them!!
With my camper loaded in the bed I run 65 front and 70 rear psi. Empty I run 45 front and 40 rear. With an F rating A guy could get away with pressure as low as 30 psi I am sure. That was a normal pressure in tires back in the 80s when I first started driving trucks.