37s road tire pressure

[Snazzelberrywillie]

Yeah, I did chalk test and came up with 32ish...which also "feels" best to me. Gave up long time ago worrying about fuel economy with Jeeps.

Thanks. Thats what I'm thinking is around 30. I will do the chalk test. Just was curious what others are running.

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[BUNK657]

I just made the upgrade to 37s, Pro Comp MT2. I'm running them at 35 psi. On the road they feel great. It's like riding on a cloud.

 

[Phishs]

I have 37” BFG KO2s on stock rims. The dealer put 40 psi in them which was obviously too much right away. I’ve went down a lb each time down to 32 psi but still have this small ~ 1/2” patch on the inside of the tires that doesn’t touch the pavement (see pics). At 40 psi, it was both sides of the tire. Im Not sure if I should go even lower than 32 psi to get the whole tread to touch or if it even would eventually? Also a little concerned if it’ll affect mpg and/or tire wear? Not sure if the 7.5 wheel width is the problem and it won’t get fixed by lower psi? TIA for any helpful info.

 

[fourfa]

Lower pressure will definitely cost you MPG. Higher pressure will definitely prevent even treadwear. Both cost you money (more fuel vs premature tire replacement). Up to you to do a little testing to see where the balance is, as every combination of tire and truck will be different. It's not hard to run a few tanks at different pressures and see how big the MPG impact is

In my previous experience with much smaller and cheaper KOs (not KO2s) on a smaller truck, the shit MPG cost more than shorter tire lifespan (since I mainly had to toss the tires with giant rips in the sidewalls). So I ran them at like 60psi on pavement (they were also E-range, waaaay too heavy for that truck). Totally different experience with different tires on that same truck.

 

[Jefe1018]

I’m running a 37x12.5R17 Grabber ATX, 29-31psi is the sweet spot before it gets too rough over speed bumps and pot holes. Around 25 I’ve found the tires get too squishy and complain around corners… I also feel more body role than what I’m used to so 30 is where I like to be.

 

[Phishs]

I have 37” BFG KO2s on stock rims. The dealer put 40 psi in them which was obviously too much right away. I’ve went down a lb each time down to 32 psi but still have this small ~ 1/2” patch on the inside of the tires that doesn’t touch the pavement (see pics). At 40 psi, it was both sides of the tire. Im Not sure if I should go even lower than 32 psi to get the whole tread to touch or if it even would eventually? Also a little concerned if it’ll affect mpg and/or tire wear? Not sure if the 7.5 wheel width is the problem and it won’t get fixed by lower psi? TIA for any helpful info.

What about the pics I posted above. Is it odd that its only on the inside? Does this definitely mean that it just needs lower psi? I am surprised its just on the inside of the tires like this and not sure what to do to correct it?

 

[Jeeperjamie]

I run 34 cold in mine and 39 when towing my camper. My 37" Geolanders have got around 34,000 miles on them and I'll probably get another 30,000 out of them with a 4 tire rotation. They are wearing eventually and I have the dealership rotate them at each oil change, every 9,000-10,000 miles.

 

[Flanders]

I'm planning on switching from 35s to 37s soon. Probably 37x12.5r17 General Grabber x3. Just wondering what everyone has found to be a good pressure for wear,ride and fuel economy.

Why not start with the TRA Load Inflation Tables? They're available on both Toyo's and Falken's websites.

https://www.toyotires.com/media/pxcjubjs/application_of_load_inflation_tables_20200723.pdf

For a gas Rubicon, the stock tire is LT285/70R17 at 37 psi, with a load rating of around 2200 lbs according to the tables.

37x12.50R17LT is good for 2150 lbs at 25 psi and 2470 at 30 psi. Derate by 10% when going to a larger size. The minimum would be about 29 psi for the gas Rubicon.

 

[USMC32GTR]

I run 34 cold in mine and 39 when towing my camper. My 37" Geolanders have got around 34,000 miles on them and I'll probably get another 30,000 out of them with a 4 tire rotation. They are wearing eventually and I have the dealership rotate them at each oil change, every 9,000-10,000 miles.

Just had my 37” Geolandars (MTs) installed and they set them at 39 psi. Curious if 34psi ended up being the sweet spot for you wear-wise after some more mileage? Just looking for a good starting point as I measure my tread every oil change and adjust. Thanks

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