Tire Pressure is suppose to be...

[Johnkn]

Tirereview..com

Michelin performed a hydroplaning resistance test using pressures above the “max pressure/max load” rating. The test was motivated by the common practice among law enforcement officers of inflating their tires above that recommended by the vehicle manufacturer. The test almost doubled the “max pressure” without discovering where hydroplaning resistance reached a plateau.
Conversely, a 5 psi drop below the manufacturer’s recommended pressure showed a notable reduction in the tire’s ability to disperse with deep water. Also, multiple tests with “people-off-the-street” revealed that pretty much everyone can notice a difference in wet handling between tires set to the manufacturer’s recommendations and those set to just ABOVE the threshold for a warning from the TPMS.
(Pardon my repetition: The “max pressure/max load” number on the sidewall has NOTHING to do with the burst pressure of the tire. That number indicates where adding more air pressure will not allow the tire to carry additional weight. The burst pressure is a shockingly high multiple of the “max pressure.”)"

Furthermore:
"Can we improve handling and ultimate grip by increasing tire pressure? You bet! In race-track-style pressure tests we found that increasing the pressure on the end with less grip worked wonders. If the front tires lost grip first, adding front pressure and reducing rear pressure allowed an expert driver to get around corners faster. (Just to make things clear: This was on a test track and the goal was to make the car go around corners much faster than would make sense on public roads.)"

Stop googling, copying, pasting and spewing a bunch of irrelevant, circular crap here.

.

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[jsus]

Because I'm old enough to know a thing or two because I've seen a thing or two.

I'd start posting links if it would get some youngins to STFU but I don't think they would.

Is that what you want, everyone else to shut up and accept everything you say without giving it a first thought in an attempt to understand?

Sounds trollish...

 

[GPSMan]

I mean.. seriously! It's scary enough that so many people don't know the maximum inflation on the tire sidewall is not the correct pressure on any vehicle. Then people see things like this on the internet. His advice is just as bad as someone saying "inflate your tire to 15 PSI so the ride will be more comfortable. Because what? The car manufacturers just throw out arbitrary numbers for recommended tire pressure?

Seriously.
Seriously isn't it odd with computers and engineering and digital this and decimal point that, isn't is seriously weird that with all the makes, models, and variants in TIRES and VEHICLES and CLIMATES and ROAD CONDITIONS that the vast majority of all cars list 35 psi as the air pressure setting?

Either you can't think critically or you think its just wild "coincidence" that most tires on most cars are set to 35 psi. So which is it?

Explain how 80-90% of car tires list 35 psi. Even though the vehicles are vastly different in size, shape, weight, and horsepower. Please. I don't think you can.

It is really what should be considered a safe for all seasons, average for all conditions, average pressure for people, like most people, who want to set it and forget about it.

 

[FordDiehard]

My Ford Pass app says recommended cold pressure is 35 front / 35 rear. Owned it for a week and tire monitoring says all are high. Go look at the tires and they state maximum pressure is 51 psi.

What are you guys running or what are we suppose to be running? Stock XLT tires

Do you really own a '63 Galaxie 500!?!

 

[Art Vandelay]

Explain how 80-90% of car tires list 35 psi. Even though the vehicles are vastly different in size, shape, weight, and horsepower. Please. I don't think you can.

So what are you insinuating here? That it's a conspiracy by the auto manufactures and tire manufacturers to set recommend 35 PSI so the tires will wear faster?

 

[Johnkn]

Seriously.
Seriously isn't it odd with computers and engineering and digital this and decimal point that, isn't is seriously weird that with all the makes, models, and variants in TIRES and VEHICLES and CLIMATES and ROAD CONDITIONS that the vast majority of all cars list 35 psi as the air pressure setting?

Either you can't think critically or you think its just wild "coincidence" that most tires on most cars are set to 35 psi. So which is it?

Explain how 80-90% of car tires list 35 psi. Even though the vehicles are vastly different in size, shape, weight, and horsepower. Please. I don't think you can.

It is really what should be considered a safe for all seasons, average for all conditions, average pressure for people, like most people, who want to set it and forget about it.

LOLLL

So here you suggest to adhere to the OEMs tire pressure recommendations printed on the tag in the lower right hand corner of the drivers door jam, however in the trailering thread you state that Fords tow rating of 2000 lbs for hybrids on the same tag means nothing, is not Inforcable, and it’s perfectly ok for everyone to routinely tow 3300lbs (60% over the OEM rating) like you do?


That’s rich..

 

[GPSMan]

"Higher pressure reduces the tire deflection onto the sidewall, which keeps more of the treaded portion of the tire on the road. As you inflate the tire, you get more stiffness and cornering ability. But you also get a smaller footprint, thus less traction. This means that at some point the trade-off between stiffness and traction reaches a breakeven point, so increasing tire pressure past that point will be counterproductive (NHTSA publication, Pneumatic Tire HS-810-561, p. 336). A study by the Society of Automotive Engineers in 2006 (Tire Asymmetries and Pressure Variations in the Radt/Milken Nondimensional Tire Model) concludes that tire pressure has a significant effect on tire performance when it comes to lateral force and slip angle. And if you reference the 2013MY Police Interceptor and Utility Modifier Guide published by Ford, standard tire pressures are listed. But it also reads, “Do not inflate tire higher than maximum pressure stamped on tire sidewall.” You will get markedly better performance when you inflate to the higher pressure stamped on the sidewall."

 

[OleFordGuy]

Puzzling Guy, maybe too much THC back in the day

 

[jsus]

So what are you insinuating here? That it's a conspiracy by the auto manufactures and tire manufacturers to set recommend 35 PSI so the tires will wear faster?

Apparently. It's all a conspiracy.

Or, it's engineering. Either way.

33-35 PSI on a tire designed for ~45-50 PSI means that the tire is not at risk of experiencing excessive stress or wear, even if the tire is inflated higher.

Using a narrow design target for tire pressure means you've locked in some of your variables from the start. You know you need to target a tire that can hold a certain amount of weight (based on the vehicle's weight distribution), at a consistent PSI.

Higher pressure sacrifices ride quality amongst other things, which no manufacturer will recommend. It's also going to start putting more stress on other suspension, etc. components.

Why would one expect passenger vehicles to be built with a wide variance in tire pressure from one model to another?

The simplest reason you'd want passenger vehicles to have relatively close tire pressure recommendations? Simplify things as much as possible in the hopes that the driver will actually follow it. If a driver is used to their Focus being rated for 35 PSI, and they get a Maverick, most of them cannot be expected to actually check the door jamb recommendation. There's a good chance they'll stick with what they know, inflating the Maverick to the same 35 PSI they used on their Focus.

Ultimately, YMMV and liability is on you if you choose to greatly differ from the vehicle manufacturer's recommendations. Doesn't mean the tires will blow or prematurely wear, but it means you need to know what you're doing and have your own reasons to deviate.

Depending on conditions, my tires tend to be kept a few PSI over the door jamb recommendation, but not as high as it came from the factory.

 

[GPSMan]

So what are you insinuating here? That it's a conspiracy by the auto manufactures and tire manufacturers to set recommend 35 PSI so the tires will wear faster?

Not at all.
Just they had to pick something but people don't like to read charts and graphs for a
Multitude of conditions so they K.I.S.S. and post a "mid range" number that is going to be fine for most customers. That does not make it "best" for all users and all conditions.

 

[paneubert]

Is that what you want, everyone else to shut up and accept everything you say without giving it a first thought in an attempt to understand?

Sounds trollish...

It is not necessarily trollish, but is certainly a textbook "appeal to authority" fallacy.

 

[GPSMan]

Apparently. It's all a conspiracy.

Or, it's engineering. Either way.

33-35 PSI on a tire designed for ~45-50 PSI means that the tire is not at risk of experiencing excessive stress or wear, even if the tire is inflated higher.

Using a narrow design target for tire pressure means you've locked in some of your variables from the start. You know you need to target a tire that can hold a certain amount of weight (based on the vehicle's weight distribution), at a consistent PSI.

Higher pressure sacrifices ride quality amongst other things, which no manufacturer will recommend. It's also going to start putting more stress on other suspension, etc. components.

Why would one expect passenger vehicles to be built with a wide variance in tire pressure from one model to another?

The simplest reason you'd want passenger vehicles to have relatively close tire pressure recommendations? Simplify things as much as possible in the hopes that the driver will actually follow it. If a driver is used to their Focus being rated for 35 PSI, and they get a Maverick, most of them cannot be expected to actually check the door jamb recommendation. There's a good chance they'll stick with what they know, inflating the Maverick to the same 35 PSI they used on their Focus.

Ultimately, YMMV and liability is on you if you choose to greatly differ from the vehicle manufacturer's recommendations. Doesn't mean the tires will blow or prematurely wear, but it means you need to know what you're doing and have your own reasons to deviate.

Depending on conditions, my tires tend to be kept a few PSI over the door jamb recommendation, but not as high as it came from the factory.

Now that is a reasonable answer.

 

[LM42]

Tirereview..com

Michelin performed a hydroplaning resistance test using pressures above the “max pressure/max load” rating. The test was motivated by the common practice among law enforcement officers of inflating their tires above that recommended by the vehicle manufacturer. The test almost doubled the “max pressure” without discovering where hydroplaning resistance reached a plateau.
Conversely, a 5 psi drop below the manufacturer’s recommended pressure showed a notable reduction in the tire’s ability to disperse with deep water. Also, multiple tests with “people-off-the-street” revealed that pretty much everyone can notice a difference in wet handling between tires set to the manufacturer’s recommendations and those set to just ABOVE the threshold for a warning from the TPMS.
(Pardon my repetition: The “max pressure/max load” number on the sidewall has NOTHING to do with the burst pressure of the tire. That number indicates where adding more air pressure will not allow the tire to carry additional weight. The burst pressure is a shockingly high multiple of the “max pressure.”)"

Furthermore:
"Can we improve handling and ultimate grip by increasing tire pressure? You bet! In race-track-style pressure tests we found that increasing the pressure on the end with less grip worked wonders. If the front tires lost grip first, adding front pressure and reducing rear pressure allowed an expert driver to get around corners faster. (Just to make things clear: This was on a test track and the goal was to make the car go around corners much faster than would make sense on public roads.)"

A couple things. I have no doubt you’ve learned some things in your time and I am not discounting your personal experiences. But, you posted information on two very specific tests. Antihydroplaning benefited from higher tire pressure because increasing pressure makes the tire taller and therefore narrows the contact patch. This is why you never find super wide winter tires. A wide tire just becomes a boat in wet enough conditions. Most people hydroplane because they are driving too fast for the conditions and/or have worn out tires and perhaps bad tire pressures to boot. The average driver should really never worry about that given the above criteria is NOT met. And for the race track scenario, VERY few people in this forum are capable of driving their cars at the traction limit at all. Much less with enough car control and feel to be able to use pressure adjustments to either negate a slide or to move the car back and forth between under and oversteer as is being described.

 

[LM42]

Seriously.
Seriously isn't it odd with computers and engineering and digital this and decimal point that, isn't is seriously weird that with all the makes, models, and variants in TIRES and VEHICLES and CLIMATES and ROAD CONDITIONS that the vast majority of all cars list 35 psi as the air pressure setting?

Either you can't think critically or you think its just wild "coincidence" that most tires on most cars are set to 35 psi. So which is it?

Explain how 80-90% of car tires list 35 psi. Even though the vehicles are vastly different in size, shape, weight, and horsepower. Please. I don't think you can.

It is really what should be considered a safe for all seasons, average for all conditions, average pressure for people, like most people, who want to set it and forget about it.

And here you are making up statistics. Have you searched 80-90% of auto manufacturers tire pressure specs? I have multiple vehicles in our lineup that all use tire pressures in the 40’s. But you are right. It is not a coincidence that tire pressure numbers are pretty close for most passenger vehicles. They are determined that way to give the best combination of life, ride, and overall performance. No regular passenger tire is made to excel in only one category

 

[GPSMan]

And here you are making up statistics. Have you searched 80-90% of auto manufacturers tire pressure specs? I have multiple vehicles in our lineup that all use tire pressures in the 40’s. But you are right. It is not a coincidence that tire pressure numbers are pretty close for most passenger vehicles. They are determined that way to give the best combination of life, ride, and overall performance. No regular passenger tire is made to excel in only one category

And that's what I was saying all along.
Different pressures can be helpful in different conditions! And there is no science behind 35 psi being "perfect".

So many consider the door sticker as the 11th commandment: "Thou shall only use 35 psi."

Just everyone from the lawyers to the car designer agree it's a pretty safe pressure for a wide variety of conditions.

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