I read many threads about tire pressure for ridge grapplers, KO2’s, and other load E tires with tons of people running between 40 and 50 PSI.

I decided to run 40 PSI on my ridge grapplers and the rears wore really poorly with the middle obviously more worn than the edges (sign of over inflation) after just 5,000 miles. I can’t imagine the people running 50 PSI in the rears.

Fronts look pretty evenly worn - think this is due to more weight than the front.

I guess this this post is just a public service announcement warning people to not listen to the forums and do their own chalk line test if they want even wear.

Anyone else have similar results at X PSI?

 

I run Yokohama Geolandar G015 LT285/55R20 at 40 PSI. I have 20000 miles on the tires, rotated every 6000 miles. The tread is evenly worn. Three tire rotations so the back tires have about 12000 miles in that position.

 

 

 

 

Yes, I measure my tires before taking them in for rotation in three spots (outer edges and middle). My wife was suckered into an alignment many years ago for supposed uneven tire wear. I checked when she returned home and found no issues so it is an OCD thing now. The old military saying "Trust but verify"

You did not post your tire and wheel/rim size (width). If you up sized beyond a +1 fitment (i.e. same profile and one step up in width), you will have to adjust pressure lower. A tire too wide for the rim will crown in the middle causing uneven tire wear.

EXAMPLE: OEM 275/55R20 +1 LT285/55R20 (my size), +2 LT295/55R20 (will crown in middle)

 

I put 55k miles on a set of E rated Nitto Terra Graps at 60psi the whole time, and they wore perfectly all across the tread the entire time. And I might add that they were mounted on a <5klbs Chevy Colorado
Regular rotation and using the proper width wheels for your particular tire size has a lot to do with it. So does properly maintained suspension.

 

 

Interesting. I run my TerraGrappler G2's at 52 PSI(my tire guy suggested running min of 50 being a 10-ply) and after 35k they are wearing great. I don't see any problems in getting 60k+ out of them. They honestly don't look like they have worn any since new. I put just P rated stock size TerraGrappler G2's on my wife's 4Runner. They have 52k on them and are wearing even and reasonably expect to get 65k out of them. I will definitely buy the G2's again. Very happy with them.

 

My tires are 285/70R18 on a 9 inch wheel. You make a solid point about wheel width.

With all the variables, I guess there isn't a single answer.

Would be most wise for everyone to do a chalk test and taking the forums with a grain of salt.