I recently put 33x12.5 Dunlop Radial Mud Rovers on my 2 door X. The installer put them on at 40 psi. I did the chalk test and it seemed even, but rougher on road. I dropped to 35 psi and either I read wrong or something but chalk test seemed good. Ride was softer, more what I wanted. My question...would running at 35 psi have any negative effects on wear? I am fairly new to MT style tires so I want to optimize their already short life. Thanks.

 

The chalk test gives you the amount of pressure you need pertaining to your vehicle. Most tire shops fill them with the amount needed for heavier full-size trucks. You can lower them down to 30psi for the street if you want.

 

I run 33's. I air to what the sticker on the door frame says because although they're larger than stock, mine have the same max psi rating as the stocks did so I figured that was safe. The ride has been good in all conditions. Just my .02

 

Max tire pressure is for maximum load for the tire. Say max load is 1500 lbs per tires and your jeep weighs 6000lbs then fill your tires to 40 psi. here's the math 4 tires x 1500 = 6000. Since the jeep weighs less than 6000 lbs lower the tire pressure. 30 psi is good for those tires.

 

Cool thanks for the quick replies. I think I will drop them to the what the door says...seem a bit rough now.

 

Im running 33x12.5/15 goodyear duratracs at about 31lbs. The ride is good.

 

Wow, I am glad I asked, I was not sure if it would be okay to lower towards 30 psi...softer ride here I come!

 

Running 10ply 33's @ 32psi here.

 

I'm running my BFG AT KO's at 35 psi. Seems all the shops in my area fill tires to the max psi listed on the sidewall.