With a 7.5 the tire will balloon and need less psi to pass the chalk test. I wouldn't be surprised if 22 shows even chalk wear across the tread.

Fwiw ... I'm running my 35 load E tires at 23-24 psi

 

Yes, a narrow wheel will definitely need less air to get a flat contact patch.

 

Does 23-24psi not concern you? The lowest I would consider would be closer to 26. The sidewall may be plenty stiff but you'll build up excessive heat in them and (could) eventually lead to a blowout. From my tire dealer's experience, that was the problem with the Explorer's years back......too low of pressure, highway speed, warm tire....boom.

Sent from my DROID4

 

I try to stay between 28/30.

 

Chalk Test

Chalk is used to mark a line across the tire tread, side to side.
Drive a few wheel turns on asphalt, until the chalk is partially warn off.

Do it for both a front and a rear wheel. If, for some reason, the load is different for the front and rear wheels, the optimal tire pressure may be different too.

Start testing at 26~28 psi.
If, at the first try, the chalk wear is uneven, increase/decrease the psi by 2psi.
1 psi steps are too small to notice a meaningful difference.

Chalk worn at the CENTER
Like this: _____ _ _ _ _ _____
= Tread curves out = Pressure is too HIGH

Chalk worn at the SIDES
Like this: _ _ _ _ ______ _ _ _ _
= Tread curves in = Pressure is too LOW

Chalk wear is EVEN
Like this: _ _ _ _ _ _ _ _ _ _ _ _
= Flat tread = Pressure is CORRECT

 

E tires on a lighter 2 door ... No
Plus this is cold PSI..,, they get up to 26-27 after driving around a bit.

 

Ive ran my e rated in new mexico heat at 20 psi for quite awhile with no problems

 

Thanks everyone, I aired them down to 30. it rides so much better. Now ingot pull out the AEV procal to reset the tire pressure. The computer has the warning light come on at 43lbs

 

On the 10 anniversary with km2 require 43lbs...

 

Good luck and enjoy your Jeep