i have nitto terra grapplers 33 inch they are filled to like 65 pounds,it isnt real clear on sidewall how many lbs to fill ,sayas max load at 65?? Seems high,and i can feel every little bump, how much air shoukd i run ??

 

65 psi?!! seriously, you need to bring them down to about 28 psi - 65 is the "max" and way too much.

 

I run 33x12.50x15 Goodyear Duratracs load range c's at 28 psi.

 

I run my Nitto Trail Grapplers at 35psi. Which is still too high, but helps with gas mileage and I do not mind a rougher ride. I would run them at 28 to 30 to smooth out the ride.

 

I run my 285/70R17 duratracs at 33psi on a 17x8 rim. I wanted to go down to 28psi, but got TPMS lights galore.

 

33's should be at ±29psi on road and about 20psi on the trail. Could actually go way less than 20psi on the trail depending on what driving you doing. Dune driving those puppies should be down to like 10psi.
65psi is crazy

 

I'm running my 275/70/17 Hankook Dynapro MT's at 40 psi. They're brand new and I haven't really been anywhere with'em other than the highway so far. They seem to be all right so far.

 

...bf goodrich m/t km2's, 265/70r17's. max. pressure on sidewall 80 psi.

...the shop that assembled them have 'em at 40 psi..

...i think its time to break out the 'chalk'.

 

I'm pretty much with the majority. I run my 33's at 29-31 psi. I like to draw a chaulk line across the tires before I hit the road so I can see how the tires are wearing. That tells me if I need to add or decrease psi.

 

Suggested inflation rates all over the place, and comparisons to tires that aren't even close to supporting the same load.

The tires as the OP stated are going to command an inflation rate of 25-30lbs depending on the weight of their JK. The chalk test gets the math out of the way and will give you even wear to go along with the proper inflation rate.