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#2801456 - 11/13/12 01:51 PM Re: CHECK YOUR TIRE PRESSURE! [Re: Shark]
CapriRacer Offline


Registered: 02/22/03
Posts: 2545
Loc: Somewhere in the US
Originally Posted By: Shark
........Go on Ecomodder.com and some of you will have heart attacks when you see how common this is, and with no failures........


I have been tracking this for a few years - mainly because I was told to put up or shut-up - that there were NO!! downsides and NOBODY had any issues whatsoever.

What I found was just the opposite. I have page after page of remarks that folks have made about issues with elevated inflation pressures from the very websites where no issues were claimed.

The fact is that there have been failures and there have been traction issues. It just difficult to assign this where it needs to be - because the guy analyzing the failure has confirmation bias.
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#2802347 - 11/14/12 12:24 PM Re: CHECK YOUR TIRE PRESSURE! [Re: GearheadTool]
OVERKILL Online   content


Registered: 04/28/08
Posts: 26520
Loc: Ontario, Canada
Originally Posted By: GearheadTool
Originally Posted By: JHZR2
Originally Posted By: GearheadTool
Originally Posted By: accent2012
Maximum SAFE OPERATING pressure... you can inflate a tire to 50+ PSI and not blow on you... it's when you put on weight and use it is w hen the tire becomes unstable and blow. So, Max. Pressure on the sidewall = Max. SAFE pressure.

Max. Pressure label is intentional and is there to protect the consumer and the manufacturer.

Why would you intentionally fill a tire beyond the max. pressure rating on the sidewall?


I get scared when I put mine up to 40PSI as WAY too high but some pppl do that for extreme highway mileage. Just hope they never have to panic stop.

I usually get it to 36 cold 40 hot as an extreme high inflation. MOST tires I have found het 4PSI more when HOT.


You realize that some cars spec over 40 psi, right? My Saab and BMW come to mind, and both have superior stopping performance to most any car on the road.


I don't doubt that, just that that would be a first (for me.) I still have the tires at ~30-32PSI on the Volvo. Debating changing that to 33 all around...

I also had a BMW at one point, albeit much older than yours. I remember inflating to 36PSI cold as "wow, high" but for best fuel economy.. had concerns about overinflating. Bridgestone Potenza tires, I think.

I have also found just about every tire I have ever had to gain 4PSI hot, with the exception of a cheap General tire that inflated 5PSI once, though that was after a long day of extreme speed complete with a skidding stop. (Wild days.)


Here's a novel idea, check the placard on the Volvo for the correct pressure, and use that.
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#2833478 - 12/13/12 08:43 AM Re: CHECK YOUR TIRE PRESSURE! [Re: JHZR2]
teddyboy Offline


Registered: 01/18/10
Posts: 916
Loc: NC, United States
For the two Toyotas I go about 2 lbs over the recommendation on the door jam. The justification is that tires tend to lose air not gain it so there is a small margin. For the Volvo I go 1/2 to 1 lb above because 2 lbs over the 35 lbs recommended makes it ride like a buckboard.
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#2850116 - 12/28/12 03:28 AM Re: CHECK YOUR TIRE PRESSURE! [Re: Astro14]
bilibako2 Offline


Registered: 12/24/12
Posts: 28
Loc: illinois
At least twice a month.

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#2853194 - 12/31/12 12:23 AM Re: CHECK YOUR TIRE PRESSURE! [Re: JHZR2]
loyd Offline


Registered: 08/30/12
Posts: 144
Loc: California
Here's a novel idea. Get your vehicle weighed. Front axle first then both axles. Then see what the tire manufacturer whose tires you are running recommends and use that pressure.


Edited by loyd (12/31/12 12:23 AM)

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#2853370 - 12/31/12 08:30 AM Re: CHECK YOUR TIRE PRESSURE! [Re: JHZR2]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 15181
Loc: Sunny Florida
Great advice for you perhaps.

Many others would do well to simply use the pressure recommendation written in their owners manual.
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#2853393 - 12/31/12 08:56 AM Re: CHECK YOUR TIRE PRESSURE! [Re: JHZR2]
DBMaster Online   content


Registered: 09/18/12
Posts: 2195
Loc: Rick Perry World
If you're math-oriented you could just use the published weight of your vehicle and divide it by the total of the maximum load stamped into the tire sidewall (sum of all four). Take the resulting fraction and multiply it by the maximum inflation pressure stamped on the tire sidewall. I did this a couple of times and found that the pressure obtained this way was very close to the recommended pressure on the door jamb.

This more or less assumes you are using tires that have the same or similar load rating than your OE tires.

Pretty cool, huh?

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#2859607 - 01/05/13 07:28 PM Re: CHECK YOUR TIRE PRESSURE! [Re: JHZR2]
easytim Offline


Registered: 08/21/08
Posts: 147
Loc: New Mexico


I use these, $2.00 each they are very well made, they are set for 40lb's 40lb might be a little high but the car handles better overall and I like the idea of getting better gas mileage.

Just a walk around the car to make sure they are all reading green, its simple


Edited by easytim (01/05/13 07:40 PM)

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#2859620 - 01/05/13 07:44 PM Re: CHECK YOUR TIRE PRESSURE! [Re: JHZR2]
easytim Offline


Registered: 08/21/08
Posts: 147
Loc: New Mexico
Heres the tire I'm putting 40lb of air in these tires. The MAX amount of air is stated on the tire 44 P.S.I.

http://wot.motortrend.com/pennies-on-the...l#axzz2H9knXDXP


Edited by easytim (01/05/13 07:58 PM)

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#2859700 - 01/05/13 08:49 PM Re: CHECK YOUR TIRE PRESSURE! [Re: JHZR2]
HerrStig Offline


Registered: 08/24/11
Posts: 3017
Loc: Boston, MA
Going to the high end on tire pressure maght make your sedan handle like a gokart on smooth roads (or seem like it, anyway) but in the frozen north the wear and tear on suspension parts and wheel bearings comes back to haunt pretty quickly especially with 60 and down series tires. I do a little autocrossing , and I run wide alloy rims with tires to match, Koni struts, and a front strut tower bar and stiffer bushings in the suspesnion links, but I don't see much payback from going over 36 pounds in the tires. . It's all about tire footprint, IS the tire FLAT on the road from tread edge to tread edge? The racer guys use a tread temp gauge to measure across the tread looking for hot spots. Harder to do on the street, you have to resort to looking at wear patterns instead. I have always understood the max tire pressures were for carrying a lot of people and luggage, on a lot summer day, at high speed, not keeping the tires of an unloaded car in contact with a bumpy road. Some IRS layouts introduce quite a bit of camber, overinflate the rear tires and the inside edges wear real fast.

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#2861499 - 01/07/13 01:14 PM Re: CHECK YOUR TIRE PRESSURE! [Re: JHZR2]
alex3686 Offline


Registered: 01/07/13
Posts: 63
Loc: Florida
I check mine every few days because my left front drivers side tire is always leaking air out of em I WOULD NEVER GET DUNLOPS again.

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#2873166 - 01/16/13 03:30 PM Re: CHECK YOUR TIRE PRESSURE! [Re: JHZR2]
Miller88 Online   content


Registered: 04/09/08
Posts: 6860
Loc: Onondaga County
Between my two vehicles, I have 4 sets of tires. The recaps and factory tires on the focus do not leak. One of the winterforce tires on my car leaks a few PSI a week, and one of the AT tires on my Cherokee leaks about 10PSI a weeek (if not driven) or none if driven.



Edited by Miller88 (01/16/13 03:33 PM)
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#2873241 - 01/16/13 04:40 PM Re: CHECK YOUR TIRE PRESSURE! [Re: JHZR2]
KitaCam Offline


Registered: 11/16/12
Posts: 1585
Loc: SunnySouthFlorida
Check newly mounted tires checked every few days to reconfirm asked-for pressure and to make sure there's no loss when mounting liquid brushed on the tires dries...

Then every two weeks....

On the Kitacam (LE/4cyl) F/R are above recommended 29psi...
Front 33, just enough to eliminate squealing on tight turns...
Rear 34 to get the rear end out and around the turn "more quickly"...


Edited by KitaCam (01/16/13 04:42 PM)
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#2873983 - 01/17/13 09:51 AM Re: CHECK YOUR TIRE PRESSURE! [Re: DBMaster]
CapriRacer Offline


Registered: 02/22/03
Posts: 2545
Loc: Somewhere in the US
Originally Posted By: DBMaster
If you're math-oriented you could just use the published weight of your vehicle and divide it by the total of the maximum load stamped into the tire sidewall (sum of all four). Take the resulting fraction and multiply it by the maximum inflation pressure stamped on the tire sidewall. I did this a couple of times and found that the pressure obtained this way was very close to the recommended pressure on the door jamb.

This more or less assumes you are using tires that have the same or similar load rating than your OE tires.

Pretty cool, huh?


Pretty wrong.

First, it assumes the weight on your tires is the same all around - OR - if you use the GAWR's, it assumes the there is no difference side to side.

Also, it assumes that the maximum pressure is where the maximum load occurs - which is not always true.

It also assumes that tires should be inflated right up to the minimum pressure needed to carry the load.

Al in all, not well thought out.
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Visit my web site: www.BarrysTireTech.com

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#2874167 - 01/17/13 12:27 PM Re: CHECK YOUR TIRE PRESSURE! [Re: JHZR2]
DBMaster Online   content


Registered: 09/18/12
Posts: 2195
Loc: Rick Perry World
To quote Steve Martin, "Well, excuuuuse me!"

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