Another tire pressure question, (with pics)...

[fireman9027]

Currenty I'm running 30psi.

I'm coming from a Rubicon with the 285's which were supposed to be at 37psi on the stock 71/2 wide tire. I now have 37x13.5x17 on a 17x9 inch wheel.

The stock tires were "C" load, the Yokahama M-XT Im running now are "E" load. The tire pressure calculator that I found on this site, calculated that I should be running 26.74 PSI, and the chalk test isn't even close.

For some reason I'm paranoid about running less than 30psi, I haven't found any info saying anything good or bad about going less than 30, just a gut feeling that I shouldn't go lower than 30.

Is there anyone on here that is running their daily driver less than 30?

If so what has been your experience running that low on a daily driver.

I'm posting a pic to show that im not showing ANY wear on the outside tread, I'd like to hear some opinions on using a pressure that low....

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[azjl#3]

go look at any cars tires, you will see a segment of the outer part of the tread not worn. It gets worn down in cornering. I do lots of cornering in the mountains.

I played with the contact patch and tire pressure a decade ago. To get full contact on my 35's i needed to hit 15psi, way to low, it drove like crap. I run 34-36psi on km2 35's, they warm up to 38, drives great.

Look at contact patch on new OEM tires, just like yours.

The design guys do pretty good matching tire pressure to performance.

Offroad air down is different question.

 

[Rogersocal]

i have 37" Nitto Ridge grapplers, I fill 32 cold once warm i see 35-36. I tried 24 PSI because of many factors. hated the acceleration and the squish when taking corners quickly.

yes it might wear more in the middle from "Over inflation" but i dont care, I drive it like i stole it and ill just change tires out when its needed.

I airdown to 10 PSI when Off Roading though.

 

[GATORB8]

Stock tires came off the first weekend, and the Jeep hasn't seen more than 30 psi since then.

 

[Rangemaster]

I run my 37’s at 28 psi, when they are warmed up its right at 30 psi. Anything more and you wear the center part of the tire down first.

 

[jadmt]

Currenty I'm running 30psi.

I'm coming from a Rubicon with the 285's which were supposed to be at 37psi on the stock 71/2 wide tire. I now have 37x13.5x17 on a 17x9 inch wheel.

The stock tires were "C" load, the Yokahama M-XT Im running now are "E" load. The tire pressure calculator that I found on this site, calculated that I should be running 26.74 PSI, and the chalk test isn't even close.

For some reason I'm paranoid about running less than 30psi, I haven't found any info saying anything good or bad about going less than 30, just a gut feeling that I shouldn't go lower than 30.

Is there anyone on here that is running their daily driver less than 30?

If so what has been your experience running that low on a daily driver.

I'm posting a pic to show that im not showing ANY wear on the outside tread, I'd like to hear some opinions on using a pressure that low....

Toyo has a great inflation guide and it is not specific for Toyo so rest assured you are ok running your Yoko's at less than 30psi. they show a 37x12.5-17 has a 2150 load capacity at 25psi..that means 4 37x12.5-17's at 25psi will support 8600lbs....something I like better than the chalk test is the 10% rule...ie cold psi should go up 10% when fully warmed up..for easy math if your cold psi is 30psi then when after running for 10 or 15 miles down the highway they should be around 33psi.
https://www.toyotires.com/media/pxcjubjs/application_of_load_inflation_tables_20200723.pdf

 

[MntGoat]

My 37s have a perfect chalk test @26 in all 4.
I have about an inch of outer tread off road, I can do a chalk test daily as I have a dirt driveway that turns onto asphalt.

Cruising back roads, run 20 no problem, still breaking my tires in so, I haven't gone lower yet.

Will probably be around 12 when said and done. We'll see

 

[Rogersocal]

Toyo has a great inflation guide and it is not specific for Toyo so rest assured you are ok running your Yoko's at less than 30psi. they show a 37x12.5-17 has a 2150 load capacity at 25psi..that means 4 37x12.5-17's at 25psi will support 8600lbs....something I like better than the chalk test is the 10% rule...ie cold psi should go up 10% when fully warmed up..for easy math if your cold psi is 30psi then when after running for 10 or 15 miles down the highway they should be around 33psi.
https://www.toyotires.com/media/pxcjubjs/application_of_load_inflation_tables_20200723.pdf

Meeting Load rating need and drivability are two different things in my opinion. Load rating dictates 24-26 psi and i really disliked the drivability. running 32PSI cold means you fail the caulk test, wear out the middle of the tire a little more but drives way better. Again my opinion only with supporting data. I saw firsthand the difference in Rotational resistance pretty quickly and said screw that low PSI

 

[jadmt]

Meeting Load rating need and drivability are two different things in my opinion. Load rating dictates 24-26 psi and i really disliked the drivability. running 32PSI cold means you fail the caulk test, wear out the middle of the tire a little more but drives way better. Again my opinion only with supporting data. I saw firsthand the difference in Rotational resistance pretty quickly and said screw that low PSI

that has not been my experience but we all have different experiences...I can easily run 26-28psi on the highway on my two sets of tires on E load 255/85-17 and one D load 35x12.5-17 . when I go to moab I set them at 14-15psi when I get there and never air back up until we leave and we do a fair amount of driving on asphault between the trails...

 

[azjl#3]

Toyo has a great inflation guide and it is not specific for Toyo so rest assured you are ok running your Yoko's at less than 30psi. they show a 37x12.5-17 has a 2150 load capacity at 25psi..that means 4 37x12.5-17's at 25psi will support 8600lbs....something I like better than the chalk test is the 10% rule...ie cold psi should go up 10% when fully warmed up..for easy math if your cold psi is 30psi then when after running for 10 or 15 miles down the highway they should be around 33psi.
https://www.toyotires.com/media/pxcjubjs/application_of_load_inflation_tables_20200723.pdf

consider, going off camber, up hill or down, you may only have two wheels on ground supporting 5-6000lbs.

 

[fireman9027]

Thanks for all the posts guys, I'll be breaking the 30psi barrier in the morning

 

[jadmt]

consider, going off camber, up hill or down, you may only have two wheels on ground supporting 5-6000lbs.

has never been an issue...guys are down to 5-10psi offroad all the time and never an issue.

 

[Rogersocal]

has never been an issue...guys are down to 5-10psi offroad all the time and never an issue.

In this regard I'd have to agree. I run 10 psi off roading... never an issue

 

[Ratbert]

The tire pressure calculator that I found on this site, calculated that I should be running 26.74 PSI, and the chalk test isn't even close.

Not even close in what regard? Too high? Too low?

I'm pretty sure a chalk test (which some here have a severe disdain for) should be done with warm tires. Most people seem to do the test while they're cold, but they're rarely cold when actually driving.

 

[fireman9027]

Not even close in what regard? Too high? Too low?

I'm pretty sure a chalk test (which some here have a severe disdain for) should be done with warm tires. Most people seem to do the test while they're cold, but they're rarely cold when actually driving.

Too high.

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