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  #13  
Old 03-02-2014, 03:11 PM
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Re: Why are so many vehicles ...

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Originally Posted by Rexlion View Post
For decades, tire companies have acknowledged that in most circumstances tires wear slowest and best when inflated to max pressure as marked on the sidewall. This has been common knowledge for a long time.
Thats common knowledge I've never heard. Surely there must be plenty of sources corroborating that statement available, can you point us towards some?

Quote:
After Ford took it in the rear end from the media, suddenly the "proper" tire psi increased.
I had an Explorer and was around the Explorer world when all that was going down...low tire pressures were an excuse thrown out by Firestone to shift blame back to Ford. The Explorer came with tires other than just the Firstone Radial ATX tire, my Explorer came with Goodyear Wrangler RT/S tires. Only issues with tread separation were with the Firestone tires...recommended pressures were the same.

Quote:
I'd like to point out that I said I tow almost constantly.
Thats fine for you, but you're telling other people to do something based on your unusual use patterns.

There is just a ton of information out there that doesn't support the idea that tires should be inflated to the max pressure:

Tire Rack:

http://www.tirerack.com/tires/tirete...jsp?techid=196

Quote:
A tire's maximum inflation pressure is the highest "cold" inflation pressure that the tire is designed to contain. However the tire's maximum inflation pressure should only be used when called for on the vehicle's tire placard or in the vehicle's owners manual.

A tire's "maximum inflation pressure" may be different that the assigned tire pressure used to rate the tire's "maximum load." For example, while a P-metric sized standard load tire's maximum load is rated at 35 psi, many P-metric sized standard load performance and touring tires are designed to contain up to 44 psi (and are branded on their sidewalls accordingly). This additional range of inflation pressure (in this case, between 36 and 44 psi) has been provided to accommodate any unique handling, high speed and/or rolling resistance requirements determined by the tire and vehicle manufacturers. These unique tire pressures will be identified on the vehicle placard in the vehicle's owner's manual.
Goodyear:

Goodyear: U.S. Government Sales - Police Tires

Quote:
QUESTION:

What is the correct air inflation pressure to recommend to customers to ensure complete satisfaction with their Goodyear tires?
ANSWER:

That's easy. Goodyear recommends that tires be inflated to the vehicle manufacturer's recommendation as found on the Vehicle Tire Information Door Placard or the Vehicle Owner's Manual.

WHY: Tires and correct air pressure are selected by OE vehicle manufacturers to ensure a combination of ride, handling, traction, mileage, etc. Correct tire inflation is a key factor in the vehicle manufacturer's equation of overall ride and handling characteristics. All tires have a maximum air pressure, either 35 or 44 PSI, stamped on the sidewall.

QUESTION: Should the maximum air inflation as stamped on the tire sidewall be recommended to customers?
ANSWER: Goodyear retailers should only recommend the vehicle manufacturer's correct air pressure as outlined on the Vehicle Tire Information Door Placard. In many cases, negative factors such as poor ride or irregular wear could occur if maximum air pressure is recommended to customers.
Hankook Tires:

Welcome to Hankook Tire

Quote:
Optimum inflation pressure is one of the most important aspects of caring for tires. Proper inflation pressure maintains an even ground contact pressure of the tire tread and prevents uneven wear. In addition, by reducing rolling resistance and quickly discharging any heat that is generated, internal heat levels are kept at a stable level. In sum, the right inflation pressure delivers maximum performance in terms of safe driving, riding comfort and monetary savings.
The optimum tire inflation pressure is indicated on a vehicle placard. If a placard is not available, some manufacturers list the original tire pressure in the vehicle owner’s manual. Tire suppliers can also provide relevant information. In addition, the maximum inflation pressure for safe driving is marked on the tire sidewall.
Michelin:

How To Check Your Tire Pressure | Michelin Tires

Quote:
Tires have been known to lose up to 1psi (pounds per square inch) every month, so check all tires, including your spare, once a month (or before a long trip). It’s easy. Here’s how:

-Purchase a trusted pressure gauge.
-Check your tires “cold” – before you’ve driven or at least three hours after you’ve driven.
-Insert pressure gauge into the valve stem on your tire. (The gauge will “pop” out and show a measured number. When you hear a “pssst” sound, that’s air escaping the tire. The escaping air shouldn’t affect pressure substantially, unless you hold down the air pressure gauge too long.)
-Compare the measured psi to the psi found on the sticker inside the driver’s door of your vehicle or in owner’s manual. DO NOT compare to the psi on your tire’s sidewall.
-If your psi is above the number, let air out until it matches. If below, add air (or have a Michelin retailer help you) until it reaches the proper number.
Sorry, but I'm going to listen to the manufacturers of my vehicle and my tires.
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Old 03-03-2014, 04:35 PM
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Re: Why are so many vehicles ...

After serious thought, I think you're right and I've been wrong. My ideas come out of the tire company recommendations from the era in which I started driving. They've changed since then. Unless someone is loading their tires more than usual (such as towing) or changing their tire size, they should stick close to the numbers on the door jamb.

Old dog, new tricks....
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Old 03-03-2014, 04:47 PM
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Re: Why are so many vehicles ...

Yeah its a different world today, tire technology is totally different depending on when you started driving...
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Old 03-03-2014, 09:40 PM
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Re: Why are so many vehicles ...

Yea, and the number on the door frame..or a hair more like many of us choose...preserves your kidneys over the bumps, unlike what it would feel like with rock hard rubber!
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  #17  
Old 03-04-2014, 02:56 PM
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Re: Why are so many vehicles ...

Quote:
Originally Posted by Strongjeff View Post
if you want proper inflation, look at the sticker on your door jams. it tells you what the mfg recommended pressure is at. max air pressure IS NOT SAFE, it causes the tire to wear uneven( down the center) and will give a harsh ride with in increased chance of wheel hop
That sticker reflects the recommended cold inflation pressure for normal driving, up to the load limit. The number may be reduced by the vehicle manufacturer for a compromise of soft handling over the slightly higher pressure that may give better handling, or for driving at higher [western freeway legal] speeds.

This, softer pressures, was pretty rampant not that long ago, where enthusiasts typically upped it by a few pounds for longer tire life and better handling.

Similiarly, it should be upped for sustained high speed driving, but reduce load a bit.
Oddly enough, Jeep even mentions this in the owners manual.

There's nothing magic about that number, it is a compromise for smoother riding vs tire life and handling.

Severe overinflation can lead to tire damage with SOME tires....
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Old 03-04-2014, 06:12 PM
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Quote:
Originally Posted by lstowell View Post
That sticker reflects the recommended cold inflation pressure for normal driving, up to the load limit. The number may be reduced by the vehicle manufacturer for a compromise of soft handling over the slightly higher pressure that may give better handling, or for driving at higher [western freeway legal] speeds.

This, softer pressures, was pretty rampant not that long ago, where enthusiasts typically upped it by a few pounds for longer tire life and better handling.

Similiarly, it should be upped for sustained high speed driving, but reduce load a bit.
Oddly enough, Jeep even mentions this in the owners manual.

There's nothing magic about that number, it is a compromise for smoother riding vs tire life and handling.

Severe overinflation can lead to tire damage with SOME tires....
Well eighter way. Im going off what the vehicle manufacturer says
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Old 03-04-2014, 07:26 PM
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Re: Why are so many vehicles ...

Quote:
Originally Posted by Strongjeff View Post
Well eighter way. Im going off what the vehicle manufacturer says
And the tire manufacturers...which say to follow what the vehicle manufacturer says.
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Old 03-04-2014, 10:51 PM
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Quote:
Originally Posted by Rexlion View Post
After serious thought, I think you're right and I've been wrong. My ideas come out of the tire company recommendations from the era in which I started driving. They've changed since then. Unless someone is loading their tires more than usual (such as towing) or changing their tire size, they should stick close to the numbers on the door jamb. Old dog, new tricks....
Thanks for the humble response. Wish others would follow the example.
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Old 03-05-2014, 01:05 PM
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Re: Why are so many vehicles ...

Quote:
Originally Posted by Strongjeff View Post
Well eighter way. Im going off what the vehicle manufacturer says
Thats a very good option, and may be why the recommendation exists.
Unless you are prepared to use a tire pyrometer, take contact patch prints, and measure handling [or have a racing trained bohurkus] it is hard to beat that sticker.

The vehicle manufacturer does say that for high speed driving you might want to
increase this pressure but avoid sustained speeds over 75 mph at max load conditions.

Strongly suspect some lawyer intervention ever since the Ford Exploder incidents where there were several Darwin Awards passed out for those too challenged in survival to make sure their tires were properly inflated--although the tire design likely didn't help.

Some folks just prefer a mild overinflate, which as long as it stays within the max inflation pressure there is nothing wrong with either.

More filling!
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Old 03-05-2014, 10:05 PM
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Re: Why are so many vehicles ...

I am curious to know if the door jamb stickers read the same recommended PSI for WK2's across the board? Or if they vary according to wheel size or even engine size? Perhaps some owners with 17s, 18s and 20s can take a look and chime in.

In general, the larger diameter tires tend to have greater load carrying capacity, but the WK2 weights don't vary too much... except when you get into the V8 or diesel. So hypothetically a 20" set might not need quite as much pressure as a smaller set.
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Old 03-05-2014, 10:23 PM
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Quote:
Originally Posted by Rexlion View Post
I am curious to know if the door jamb stickers read the same recommended PSI for WK2's across the board? Or if they vary according to wheel size or even engine size? Perhaps some owners with 17s, 18s and 20s can take a look and chime in.

In general, the larger diameter tires tend to have greater load carrying capacity, but the WK2 weights don't vary too much... except when you get into the V8 or diesel. So hypothetically a 20" set might not need quite as much pressure as a smaller set.
If it varies its by 2 or 3 pounds but I doubt it will
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Old 03-06-2014, 10:04 AM
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Re: Why are so many vehicles ...

To me it says the dealers are not preping the vhelicles properly before delivery. I have NEVER had a new vehilce delivered with overinflated tires. But I'm in Canada. Most dealers carry very limited stock and I've never been able to buy a new car straight off the lot. All had to be ordered.
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