Tire Pressure? (million dollar question)

WOZ4X4 · **Posted:** Mon Jul 13, 2009 8:46 am

Sorry guys, this has probably been asked on here many times, but I haven't been able to find any info for my type and size. I went with the Sport Kings A/T Tires, this past weekend. I believe the max PSI is 60 on them, guy at the local tire shop said to leave them at 50 PSI, I found that kind of high..... :shock:

I am not towing anything.

My main problem with it being so high, is my TPMS sensor computer console keeps flashing that there is to much pressure in the Tire. It obviously doesn't know that my Tires are not the old "crapy" OEM Tires. (with a max of 38PSI I believe)

So hence the question, how do I get rid of the flashing indicator, and what pressure should my Tires be at.....so I don't cause warping etc.

Thanks again, for the help.

Jeep Renny KJ4LIFE

Type = 2004 Jeep Liberty Renegade
Tires = LT235/70R16 Sport Kings A/T

Mike08Liberty · **Posted:** Mon Jul 13, 2009 9:20 am

I keep mine at 35lbs daily. I would never put it past 40. With the heat, once you drive a little distance your pressure can jump 5-7 PSI depending on how hot it is. You should drop your pressure down to 40. I think 50 is WAY too high.

bill97redtj · **Posted:** Mon Jul 13, 2009 6:10 pm

Mike08Liberty wrote:

I keep mine at 35lbs daily. I would never put it past 40. With the heat, once you drive a little distance your pressure can jump 5-7 PSI depending on how hot it is. You should drop your pressure down to 40. I think 50 is WAY too high.

I agree, 60lbs seems way high!! I'd be scared to run with pressure that high! If you have a blowout it would sound like a stick of tnt.

Quicksilversurf917 · **Posted:** Mon Jul 13, 2009 8:02 pm

I would be even scared to run at 50!!! :shock:

I run anywhere from 33-35lbs in all mine at all times besides when I wheel, which then its down to 16-18lbs

tommudd · **Posted:** Mon Jul 13, 2009 8:11 pm

Put them down in the 35/38 range and you will be good to go :wink:

ATXKJ · **Posted:** Mon Jul 13, 2009 8:14 pm

The Generic way is to draw a chalk line across the tire - drive 2-3 wheel revolutions - look at chalk
gone in the center means the pressure is too high, gone on the edges means the pressure is too low.
adjust until the line goes away all at the same time (it's easier to start high and lower - than air up each time)

FYI- if you get LT tires - load grade C,D,E - you will need at least 10 psi higher than if you have standard load or P tires
sounds weird but thicker sidewalls flexing build up heat faster than thin sidewalls flexing - and heat kills tires.

Okay - Nitto's take on replacing P's with LT's
http://www.nittotire.com/assets/safety/Replacing%20Tires%20on%20Light%20Trucks.pdf

and Toyo - (around page 11-12)
http://marktg.toyotires.com/file/loadinflationtable.pdf

WOZ4X4 · **Posted:** Tue Jul 14, 2009 2:35 pm

Thanks all for the responses,

I think the consensus, here is to be at 38-40PSI that should be proper wear and tear on the new "Sport Kings" and also get rid of the annoying reminder from my overhead console (pc) reminding me about to much air in the tires.

Thanks

P.S. Does anyone know, if you take off your tires, does the TPMS sensor reset, and would I need a re-calibration from the dealer again? If so, what a pain. Cause I was going to go back and get 5 more new chrome bolts for one of the wheels, and git rid of the rediculous "cheap cap" ended bolts. That fall off over wear and tear.....

Mike08Liberty · **Posted:** Tue Jul 14, 2009 3:18 pm

There is nothing to recalibrate. All the sensor does is send a wireless signal to the receiver in your car telling it what the PSI is.

oddball · **Posted:** Tue Jul 14, 2009 6:04 pm

Sounds like this TPMS sensor is something I should be happy my '02 Limited doesn't have.

Fwiw, I run 40 psi in my LT BFG AT ko's (245/75/16). I found running at 40 psi gives me the best gas milage results.

Mike08Liberty · **Posted:** Tue Jul 14, 2009 6:53 pm

The TPMS system is very easy to use. All you need to do is ... NOTHING :lol:

The system does everything for you. There isn't any maintenance to do on them ... Just put air in your tires and go.

oddball · **Posted:** Tue Jul 14, 2009 7:22 pm

Yeah but as WOZ4X4 stated, I don't have to deal with some lame sensor telling me my tires are over inflated or under inflated when I want them that way, either.

Mike08Liberty · **Posted:** Tue Jul 14, 2009 10:43 pm

He didn't want them at 50lbs. A shop did that. It's a good thing he sensor did come on to tell that it's too high. That "lame sensor" could have just saved him from having a blow out when on a hot day his PSI hits 55-60lbs and the tire blows when it hits a pot hole. There also good if you have a slow leak. I had a leak that was going down at about 2/3 PSI a day. Without the sensor I wouldn't have noticed until the tire was almost flat. It was on the passenger rear which as the driver you almost never see day to day. [/list]

Guest · **Posted:** Tue Jul 14, 2009 10:52 pm

He has an LRD tire which maxes out at 65 psi.

He is not going to have a blowout simply from running 50 psi.

tjkj2002 · **Posted:** Wed Jul 15, 2009 12:10 am

Load range D and E tires require more psi then P rated tires even without any extra load,just the nature of the design.When I ran D rated MT/R's 38 psi was the best for wear,with the D rated Trxus MT's 43psi was the best psi and both tires have a max of 65psi.When I ran E rated MT/R's the best psi was 55psi for wear with a max of 80psi.

TPMS was created because the utter laziness that the majority of people are now days.

oddball · **Posted:** Wed Jul 15, 2009 6:19 pm

tjkj2002 wrote:

TPMS was created because the utter laziness that the majority of people are now days.

Which also supports my claim that I don't need it. Of course when you're accustomed to running 40 psi as I am, and a tire drops to 30 psi, you'll (or should I say I will) know long before it goes flat.

Tire Pressure? (million dollar question)

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