Recommended tire pressure for 35 tires?

[JeepJeezy]

I just bought a 2015 Wrangler Sport - 2 door, a few months ago.

I have Mickey Thompson Baja STZ 315/70R17 tires with 38psi and it was a rough ride. Tonight I lowered all 4 tires to 34psi but after reading all the posts it seems like this is still way to high. I haven’t done a chaulk test yet but will try it this weekend.

Currently I do all city driving but next month I’m taking a 195 mile highway trip to the Florida Keys. Do I adjust the psi for city and highway?

I'd would adjust for the amount of extra weight, if any, loaded in the Jeep. I'm running 35 psi in my 37's. If I have the back packed for a trip I'll bump them up to 38-40 depending on how much 💩 my wife "needs" to bring.

 

[Dirty Dog]

Currently I do all city driving but next month I’m taking a 195 mile highway trip to the Florida Keys. Do I adjust the psi for city and highway?

No.

 

[Kevin - Jup]

I'd would adjust for the amount of extra weight, if any, loaded in the Jeep. I'm running 35 psi in my 37's. If I have the back packed for a trip I'll bump them up to 38-40 depending on how much 💩 my wife "needs" to bring.

Thanks for the reply … today’s ride into work was much smoother at 35psi. I hear ya about the extra 💩!!

 

[Snowbird Tom]

Appreciate the wisdom displayed here. I upgraded from mismatched junk 33s to decent 35s yesterday and knew the factory pressure wouldn't fly. It'll burn up the center of the tire and leave untouched rubber on the sides. Thanks to y'all, I've ordered a BT OBD adapter and downloaded JScan to make adjustments. Tires were all over the chart from the tire installers, so I dialed them back to 32 for now. The ride was ok before, but tires be expensive and need to keep them maintained properly.