Tire air pressure

[Idaho392]

Curious what everyone is running for tire pressure while on-road?? I have always followed the door stickers on all my vehicles (including previous Jeeps), but I've seen a few posts about people running 30-32psi with their 392's.

 

[Viking Jeeper]

What does the door say? Picking up my 392 tomorrow!

 

[PlumCrazy392]

Curious what everyone is running for tire pressure while on-road?? I have always followed the door stickers on all my vehicles (including previous Jeeps), but I've seen a few posts about people running 30-32psi with their 392's.

36 or 37 to make the tire pressure light go off. 37 psi feels fine on the road. I have the 33's (no XR). 22psi off road if not too gnarly.

 

[stumblinhorse]

The sweet spot for wranglers for 40 years has been 28-32 depending on size. Smaller uses more. I am running 32 on load C. My JKUR on load E ran 30. 35s.. if you want to follow the door sticker you need to use the same size tire indicated on the door sticker…

 

[Viking Jeeper]

if you want to follow the door sticker you need to use the same size tire indicated on the door sticker…

Yep, larger tire volume = less air pressure required. There are calculators on line. In my LJR I run 25 psi in load range C 35's. I shocked the new jeeps have recommendations in the high 30's. I was riding with a buddy in his 2 door JK and was getting my teeth rattled out on easy trails. He said his door sticker says 38 so thats what he runs.

 

[YukonCornelius]

Go by the tire rating (stamped on sidewall).
door only reflects OEM. Every manufacturer and every model varies. They are all designed for a specific PSI for road driving, factoring in safety, wear, mileage and handling based on load

 

[Viking Jeeper]

Always go by the tire rating (stamped on sidewall).

Sorry but no. Thats the max pressure the tire is designed to hold. The right pressure is almost always lower and depends on many factors but mainly vehicle weight.

 

[byhumba]

Door sticker is for the original tires and original vehicle weight. The moment you use different tires (brand, size, etc.) or add weight to your vehicle, door sticker no longer applies. Best way to know the best pressure for your unique situation is the chalk test.

 

[YukonCornelius]

@Viking Jeeper you are correct in that I was incorrect. That is max PSI., I’ve always ran 2 -3 below when cold so running temp PSI right around max, which has always given me the best treadlife and best mpg and a firm ride That said, you are also incorrect. EVERY tire is designed differently. And larger tires do not mean less volume. Again, it’s tire specific.
Example: 2018 Rubicon with 31” KO2s was max 50. Pirelli Scorpions at 33’ was 70. Same vehicle. Same tech (dealer) set pressure based on tire

 

[HearHear]

Just run whatever the inside door frame sticker says. (If you haven’t done a ton of mods to it.) I have a 392XR and sticker says 37 all the way around, so that’s what I do. Rides fine and I don't worry about it.

 

[YukonCornelius]

Hey @HearHear ! I thought the username was famIliar on the JL forum! I reposted your “Easter egg” post over here…

(made sure I gave you credit! )

 

[HearHear]

Hey @HearHear ! I thought the username was famIliar on the JL forum! I reposted your “Easter egg” post over here…

(made sure I gave you credit! )

Thanks!! Us 392 club members have each other’s backs.

 

[stumblinhorse]

Crazy there still are threads about tire psi for wranglers going on. Run whatever you want. But if you have upgraded/switched/came stock an A/T or M/T tire that is an LT type, if you are running over 35 your contact patch is too small and will impact your handling. The 37 psi on the door is for fuel efficiency not for safety or handling.

Also load range matters. max psi is 50, 65 and 80 for C, D and E respectively. More psi more load capacity. load range is used to indicate stiffness also, and people say 6, 8 and 10 ply, which is no longer the case. Load E don’t have 10 ply’s!

So pay attention to it all in setting your pressure. But I can tell you even the heaviest Wrangler on the road doesn’t need 37 psi…. The sweet spot for the last 40 years is 28-32 psi based on load range and Jeep weight.

 

[Viking Jeeper]

@Viking Jeeper you are correct in that I was incorrect. That is max PSI., I’ve always ran 2 -3 below when cold so running temp PSI right around max, which has always given me the best treadlife and best mpg and a firm ride That said, you are also incorrect. EVERY tire is designed differently. And larger tires do not mean less volume. Again, it’s tire specific.
Example: 2018 Rubicon with 31” KO2s was max 50. Pirelli Scorpions at 33’ was 70. Same vehicle. Same tech (dealer) set pressure based on tire

The maximum pressure in an individual tire varies but there is no reason to believe the maximum pressure is the correct for any situation. In your example the Pirellis are obviously a higher load rated tire so they can handle a higher pressure but no need for a high load range in a Jeep.

 

[Jeepstin392]

Dealer set the stockers at 38 psi.
deleted the TPMS, running Nitto Terra Grappler 35”, at 32 psi

 

[cburgess33]

Mine was set to like 45 from the dealer and i was surprised that the handling was awesome ! In my previous experience with any Jeep (gladiator , JL ,JK ) always had to air down so I wouldn't have to chase the road . With all that said I am planning on dropping down to like 35 because I will be doing quite a bit of off-roading

 

[Proptrash]

Crazy there still are threads about tire psi for wranglers going on. Run whatever you want. But if you have upgraded/switched/came stock an A/T or M/T tire that is an LT type, if you are running over 35 your contact patch is too small and will impact your handling. The 37 psi on the door is for fuel efficiency not for safety or handling.

Also load range matters. max psi is 50, 65 and 80 for C, D and E respectively. More psi more load capacity. load range is used to indicate stiffness also, and people say 6, 8 and 10 ply, which is no longer the case. Load E don’t have 10 ply’s!

So pay attention to it all in setting your pressure. But I can tell you even the heaviest Wrangler on the road doesn’t need 37 psi…. The sweet spot for the last 40 years is 28-32 psi based on load range and Jeep weight.

Yup. 28-30 psi for everyday road driving for me.

 

[Ward]

Curious what everyone is running for tire pressure while on-road?? I have always followed the door stickers on all my vehicles (including previous Jeeps), but I've seen a few posts about people running 30-32psi with their 392's.

36 front, 34 rear

 

[hardhat]

I ran 28 on my 2013 jkur with 37x12.5 ko2. was just right.
392 is 38 psi and have not messed with it, but probably need to drop to 30 and then go from there

 

[Fast-n-Furious]

Dealer set 37/38 on my XR, became 39/40 these couple warmer days. I can feel a bit bumpy ride on poorly paved roads. Will down to 35 today to see if any difference. And may go a bit lower as long as the TPMS alert doesn’t come up to northern me.