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#2700112 - 07/30/12 06:48 PM Re: CHECK YOUR TIRE PRESSURE! [Re: Astro14]
r34dy2fly Offline


Registered: 11/02/08
Posts: 153
Loc: Fort Polk, LA
Originally Posted By: Astro14
Originally Posted By: mystere
I follow the old school method in maintaining tires: I inflate them to the maximum cold pressure posted on the tire sidewall.


That's not old school...that's just wrong...


I'm glad you got to it before I did. I couldn't believe what I was reading. As stated the tire pressure on the side of the tire is MAX meaning that is all the tire can safely sustain. What you SHOULD be going off of is the air pressure label that is conveniently located on the inside of the door. It should tell you what to run your tires at cold. I don't even know where you got this more air = cooler concept.
_________________________
08 BMW M3 - Castrol TWS 10W-60
05 Volvo S60 - PU 5W-30

Past:
01 Porsche 911 Turbo
04 Mazda 3s
93 Mazda RX-7 R1

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#2704612 - 08/04/12 08:53 AM Re: CHECK YOUR TIRE PRESSURE! [Re: JHZR2]
CapriRacer Offline


Registered: 02/22/03
Posts: 2577
Loc: Somewhere in the US
For those of you who are influenced by data.

Let's say you are designing a vehicle - and in the process of selecting tires, you come across the following options:

a) P205/70R15 at 35 psi = 1499# load carrying capacity. Max pressure on the sidewall = 44 psi.

b) P225/70R15 at 26 psi = 1521# load carrying capacity. Max pressure = 44 psi.

For practical purposes, these 2 tires and corresponding pressure result in the same load carrying capacity.

So why is the max pressure listed on the sidewall the correct pressure? Obviously it isn't.
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Visit my web site: www.BarrysTireTech.com

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#2707976 - 08/07/12 06:23 PM Re: CHECK YOUR TIRE PRESSURE! [Re: JHZR2]
TC Offline


Registered: 09/12/03
Posts: 1638
Loc: California
"Max. Pressure" equals.....drumroll, please.....maximum tire inflation pressure. Otherwise it might have imprinted in the rubber, "Recommended Inflation Pressure" or "Required Inflation Pressure," which it doesn't. The imprint is essentially a safety warning, rather than a recommended or required setting. Same as a redline mark on a tach.

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#2717327 - 08/17/12 01:21 PM Re: CHECK YOUR TIRE PRESSURE! [Re: JHZR2]
accent2012 Offline


Registered: 02/08/12
Posts: 441
Loc: Orlando, FL
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?
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#2738681 - 09/09/12 08:49 AM Re: CHECK YOUR TIRE PRESSURE! [Re: JHZR2]
eljefino Offline


Registered: 06/15/03
Posts: 24417
Loc: ME


Wife's car picked this up. Routine "is it round" eyeballing caught it. Pre- TPMS era car. Tire was "known good" and never needed topping up, until it suddenly lost 7 lbs a day. wink

Went in at a good angle, too, check out the end where it wore.

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#2738725 - 09/09/12 09:50 AM Re: CHECK YOUR TIRE PRESSURE! [Re: accent2012]
GearheadTool Offline


Registered: 03/31/12
Posts: 1711
Loc: Boston, MA
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.
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#2740163 - 09/10/12 09:53 PM Re: CHECK YOUR TIRE PRESSURE! [Re: GearheadTool]
desmonsm Online   content


Registered: 03/25/06
Posts: 128
Loc: Planet Earth
I had new Yokohama Avid Ascend's installed today at DT and they set the rear passenger side pressure to 60psi! Needless to say I'll be having a conversation with the Manager tomorrow morning!

My TSX calls for 32/30 but I like to keep them at 36/34.
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#2740230 - 09/10/12 11:28 PM Re: CHECK YOUR TIRE PRESSURE! [Re: JHZR2]
moto94536 Offline


Registered: 06/21/10
Posts: 749
Loc: reno nv
I am glad you found it. 60 psi is really dangerous and could blow up the tire.
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#2755590 - 09/26/12 07:07 PM Re: CHECK YOUR TIRE PRESSURE! [Re: JHZR2]
ARB1977 Offline


Registered: 06/12/05
Posts: 4516
Loc: North Texas
The CRV recommends 30 psi. I fill them to 32 psi. The Taco recommends 26 front 29 rear, I fill them 34f 32r.
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#2755656 - 09/26/12 08:28 PM Re: CHECK YOUR TIRE PRESSURE! [Re: GearheadTool]
JHZR2 Offline



Registered: 12/14/02
Posts: 34022
Loc: New Jersey
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.

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#2757209 - 09/28/12 01:31 PM Re: CHECK YOUR TIRE PRESSURE! [Re: JHZR2]
skyship Offline


Registered: 06/09/12
Posts: 2071
Loc: Tettnang, Baden-Wurttemberg, G...
UMM! Don't get high tyre pressures confused with braking performance. The best braking performance is when you use the recommended pressures in the worlds most under read book, the infamous and often lost, "Owners handbook".
The recommended pressures will vary with weight and max speed, but I can assure you that pumping up normal tyres from a recommended typical 30 psi to 40 psi will increase not decrease the required stopping distance.


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.

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#2791155 - 11/02/12 06:29 PM Re: CHECK YOUR TIRE PRESSURE! [Re: JHZR2]
97tbird Offline


Registered: 05/09/03
Posts: 8590
Loc: Fayetteville, NC
I just got:

Accutire digital tire pressure gauge,
VIAIR 85P Portable Air Compressor, and a
Roadpro 12V Battery Clip-On and Cigarette Lighter Adapter smile

(didn't want to risk any blown fuses of cig lighter sockets, so with that last gadget I can hook up the compressor directly to the battery - works great)

Now all I want to do is check tire pressures... smile I should have done this years ago.
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#2798027 - 11/09/12 07:15 PM Re: CHECK YOUR TIRE PRESSURE! [Re: 97tbird]
Shark Offline


Registered: 08/26/09
Posts: 117
Loc: PA
I run my PSI so it's close to 50 when the tires are warm. I've done it in all my cars and have for years now. The max rated has always been above 50. It Improves MPG tremendously and wet performance.

Go on Ecomodder.com and some of you will have heart attacks when you see how common this is, and with no failures. The max rated PSI is there and like other ratings leaves a safety margin. To think tires will just explode filled below what the manufacturer says they're capable of holding isn't logical.

I know a woman filled her tires up all the way around and drove on it for a couple months before she complained that the car was riding funny since she put air in all her tires. The highest tire was 91psi and the lowest was 88.


Edited by Shark (11/09/12 07:17 PM)
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1995 Accord 380,000 miles (original engine and auto trans)

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#2798270 - 11/10/12 05:22 AM Re: CHECK YOUR TIRE PRESSURE! [Re: JHZR2]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 15290
Loc: Sunny Florida
^^^I sure hope you are never in an accident and found at fault. A sharp attorney will cut you up for dinner like a prime steak!

The facts are indeed true that a tire will not explode even at considerably higher than rated pressures. We used to run bias ply tires at 60 psi during autocross events in the 60's.

But the hyper mile club is endangering themselves and others with this practice, as it dramatically affects the performance envelope of the car, especially in an emergency.
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J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
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#2798312 - 11/10/12 06:56 AM Re: CHECK YOUR TIRE PRESSURE! [Re: JHZR2]
GearheadTool Offline


Registered: 03/31/12
Posts: 1711
Loc: Boston, MA
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.)

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