33" + Tire Psi Poll

Just curious havent seen much talk on tire pressures.

I personally run 25 or 26 psi for general driving and air down if nessisary wheeling. Ran 32psi for about 30 miles when I first put on the 33's and thought I was going to bounce out the window.

 

I usually do 35 in the front and 30-33 psi in the rear. I usually leave them all at 35 though, because I am lazy and don't want to adjust the air pressures after rotating tires.

That being said, a chalk test would be the best way to decide what PSI to run at. Also what your tolerance for MPGs is, if you consider that as a personal factor. Each vehicle's weight will differ depending on gear and stuff, so optimal psi could vary from truck to truck.

 

Chalk test, you'll find your answer

 

To have mine wear properly I have to have 32 front 34 rear. Anything more will wear the center too much and anything less will wear the outside too much

 

25-26 seems pretty low for street driving. Anything under 30 psi and I feel like I'm steering a boat on the street...I usually keep mine between 32-35 for daily driving.

Offroad sort of depends on the terrain, but 15 - 18 psi is the sweet spot for good traction and a softer ride, I've found. Gone as low as 6 psi in the sand to get unstuck but quickly aired back up when I was out of it.

I have E rated KO2s for what it's worth. When I first got them, the shop had them at 40 psi and I thought I was going to die on the freeway ride home, the back end was so jarring and bouncy.

 

I have P285 70 17 (so, almost 33). I have tracked my air pressure over the last 9 years, anywhere from 25 psi to 31 psi and have found that my truck feels best at 26 psi in all four tires. Chalk test yielded 27, but I like the ride better at 26. There's less "jolting" over frost heaves and road imperfections. Anything over 27 for any period of time started to wear out the middle of the treads on my truck.

285 70 17 -12 offset 4.5 BS

 

A lot of this is going to depend on the load range of the tires. C's will run at a lower PSI than E's for instance. Likely also the wheel diameter.

So, for a valid comparison, folks need to put in the tire size they are running as well as it's load range.

Personally, I'm running 255/85R16 Cooper ST Maxx at 40psi on-road, and go to 16-18psi aired down on the trail.

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