tire pressure-opinion
Thread Starter
Racer
Joined: Dec 2004
Posts: 378
Likes: 0
From: Lake Worth Florida
tire pressure-opinion
I just got my Kumoh ECSTS ASX.
They were mounted and balanced this morning.
The installer put 48 psi on each of the four tires arguing that on the side of the tire it says 51 psi maximum.
I told him on the stock runflat the max is at 44 and it does not mean that I have to put 40.
I asked him to put 30 on all 4 tires.
He said I was wrong.
I insisted and reluctantly he did what I asked for.
In your opinion and knowledge who is wrong?
They were mounted and balanced this morning.
The installer put 48 psi on each of the four tires arguing that on the side of the tire it says 51 psi maximum.
I told him on the stock runflat the max is at 44 and it does not mean that I have to put 40.
I asked him to put 30 on all 4 tires.
He said I was wrong.
I insisted and reluctantly he did what I asked for.
In your opinion and knowledge who is wrong?
Team Owner
Joined: Jul 2004
Posts: 124,397
Likes: 287
From: .... NJ
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St. Jude Donor '05 thru '19
Originally Posted by hibiscus805
I just got my Kumoh ECSTS ASX.
They were mounted and balanced this morning.
The installer put 48 psi on each of the four tires arguing that on the side of the tire it says 51 psi maximum.
I told him on the stock runflat the max is at 44 and it does not mean that I have to put 40.
I asked him to put 30 on all 4 tires.
He said I was wrong.
I insisted and reluctantly he did what I asked for.
In your opinion and knowledge who is wrong?
They were mounted and balanced this morning.
The installer put 48 psi on each of the four tires arguing that on the side of the tire it says 51 psi maximum.
I told him on the stock runflat the max is at 44 and it does not mean that I have to put 40.
I asked him to put 30 on all 4 tires.
He said I was wrong.
I insisted and reluctantly he did what I asked for.
In your opinion and knowledge who is wrong?
I would get a new installer, he is an idiot, you go by the car manufactures sticker in the door jam, or the same information is available in the owner manual. 30 PSI cold is what is stated.
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Burning Brakes
Joined: Dec 2004
Posts: 1,067
Likes: 3
From: Lost in the Pine Barrens with only ketchup and relish packs, New Jersey
Originally Posted by bsmith
go with what the car says...not the sidewall of the tire. 
Pro
Joined: Oct 2004
Posts: 538
Likes: 0
From: Edmond Ok
I set mine at 28 cold, by the time I got to work they would typicaly be around 31 or 32. On extreamly hot days, like today (107) the pressure gets around 34 after/while driving home.
I did set mine higher but the centers wore out too quickly, thats when I droped it a couple of pounds.
I did set mine higher but the centers wore out too quickly, thats when I droped it a couple of pounds.
Race Director
Joined: Jul 2004
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From: Downers Grove IL
St. Jude Donor '15
Originally Posted by Ruz
Your installer is an azzhat and never let him touch your car again.
I'd sure hate to see how many cars he has put on the road with overinflated tires. What a doofus.
Race Director
Joined: Mar 2005
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What is posted on the car door sill is of NO relevance once a NON-stock tire is mounted. But, if you air just about ANY tire up to the MAX pressure, or near max pressure, it will wear unevenly, as though the tire were overinflated.
Sidewall stiffness, comfort, handling preferences, all of these factors are involved, and you must decide for yourself what you are comfortable with.
Sidewall stiffness, comfort, handling preferences, all of these factors are involved, and you must decide for yourself what you are comfortable with.
Burning Brakes
Joined: Nov 2005
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From: "Man been singin' the Blues, since he began to till the ground"...Vancouver, USA WA.
Originally Posted by 2000BSME
What is posted on the car door sill is of NO relevance once a NON-stock tire is mounted. But, if you air just about ANY tire up to the MAX pressure, or near max pressure, it will wear unevenly, as though the tire were overinflated.
Sidewall stiffness, comfort, handling preferences, all of these factors are involved, and you must decide for yourself what you are comfortable with.
Sidewall stiffness, comfort, handling preferences, all of these factors are involved, and you must decide for yourself what you are comfortable with.
Door jam info is for OEM tires only! Most aftermarket tires will not match that info
Thread Starter
Racer
Joined: Dec 2004
Posts: 378
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From: Lake Worth Florida
Originally Posted by bsmith
go with what the car says...not the sidewall of the tire.
I think I will keep them at this pressure.
During their life I put the run flat at 31, sometimes 32, net result as anybody can guess, the wear is on the midlle, while the sides are in very good condition.
Thanks all for your valuable opinion.
Team Owner
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From: .... NJ
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St. Jude Donor '05 thru '19
Originally Posted by Herringchoker
Door jam info is for OEM tires only! Most aftermarket tires will not match that info 
The recommended pressure is based on the vehicle's design load limit and vehicle's tire size NOT the brand of tire that comes from the factory. The same tires are made to fit on several different vehicles. The only time you might want to differ from the recommended pressure is if you change the tire size significantly.
Team Owner
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From: NJ
St. Jude Donor '05-'08
Originally Posted by StephenT
The recommended pressure is based on the vehicle's design load limit and vehicle's tire size NOT the brand of tire that comes from the factory. The same tires are made to fit on several different vehicles. The only time you might want to differ from the recommended pressure is if you change the tire size significantly.
I am wondering about this only because on the track I run the same size tires different brands at different hot psi to get the most traction out of the tire. Some tires are 40psi while others perform better at 31 psi.
Actually thinking about it my Michelin Pilot Sport Cups run like crap with a cold PSI of 30 they have to be around 27 while the OEM runflats were good at 31 psi. Of course I did change tire size.
Ok I am confused
Team Owner
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From: .... NJ
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St. Jude Donor '05 thru '19
Originally Posted by Wicked Weasel
I am wondering about this only because on the track I run the same size tires different brands at different hot psi to get the most traction out of the tire. Some tires are 40psi while others perform better at 31 psi.
Actually thinking about it my Michelin Pilot Sport Cups run like crap with a cold PSI of 30 they have to be around 27 while the OEM runflats were good at 31 psi. Of course I did change tire size.
Ok I am confused
Bob,
optimizing you tires for use on the track is different then going to the local show and shine. We will assume you are talking about DOT street tires.
The maximum tire pressure marked on the tire sidewall refers to the pressure required to carry the maximum load of the tire, and is usually not the same as the manufacturer’s recommended tire pressure for the vehicle.
So for the average Joe out there the manufacturer’s recommended tire pressure should be used.
Lots of info out there on the web, this tirerack write up explains why overinflating the tires helps out at the track on sterrt tires http://www.tirerack.com/tires/tirete...e.jsp?techid=1
Some more info tire inflation pressures to be used during competition http://www.tirerack.com/tires/tirete...¤tpage=1
Last edited by StephenT; Jul 20, 2006 at 04:37 PM.
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The guy at the tire shop is 
and full of 
. That's way too much pressure in the tires. I run mine at 30 psi.
and full of . That's way too much pressure in the tires. I run mine at 30 psi.
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From: Providence Forge, VA
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Originally Posted by StephenT
I would get a new installer, he is an idiot, you go by the car manufactures sticker in the door jam, or the same information is available in the owner manual. 30 PSI cold is what is stated.
