Boomer111

Less tire lean with less tire contact patch too.

Complete bs...post prior.

cclive

There is some staggering misinformation in this thread...some of it dangerously so.

Hameister

I cannot speak for anyone's owners manual but my own.

For a 2013 GS, it's instructions are very clear.

It states that even when setting up my car for high speed track operation, defined as 175 mph, I should never exceed 38 psi cold pressure, no matter what the maximum cold rating is on the tire.

It also states that I should be using the minimum cold pressure, for maximum load, for normal daily use, which in my case is 30 psi on all 4 tires.

Simple, straight forward, designed for maximum safety, and minimum risk.

What part of that is unacceptable, or difficult to comprehend?

michaelgerson

Thanks for the pointed comments. I now lean toward listening more to what the tire manufacturer recommend. I'm amazed so many folks blindly follow GM, after they forced Goodyear's on us, which to my reading almost EVERYONE hates. My compromise would be cold pressure about 33-35 so when they heat up to high 30s - low 40s the warning flashing won't kick in.

dlind4

The weight or the car determines what tire pressure you put in. The tire can be put on many vehicles. The max pressure on the tire just determines what that particular tire can run without failing. Put 30 to 32 lbs like the door jam says.

duckvett

And who do you think sets the recommended inflation? The tire manufacturer, not GM.

You have been given some sound advice here. You have also been given one person's interpretation of sidewall markings. If you choose to not believe the advice given, call Tire Rack, tell them what tires you have and what car they are on and ask them what their recommended pressure is.

Bill Dearborn

The car manufacturers recommendation is the one to follow. If you call the tire manufacturer they will tell you that. Here is a tech article from Tire Rack that will explain it to you:

Regardless of its size, every tire's load capacity, durability, traction and handling is dependent on using the right inflation pressure for the application. Since both too little and too much inflation pressure sacrifices some of the tires' performance, maintaining the "right" inflation pressure is very important.
While a wide variety of tire sizes are available to fit the many different vehicles in use today, almost every tire size can be used on more than one vehicle. Therefore it is the vehicle manufacturers that ultimately determine the tire inflation pressures they believe best fine-tune the tires' capabilities to their specific vehicle makes and models.
The pounds per square inch (psi) pressure number branded on the tire's sidewall identifies the maximum cold inflation pressure that specific tire is rated to hold. However, the tire's maximum pressure is not necessarily the correct pressure for every vehicle upon which the tire can be used (almost all vehicle manufacturers' recommended tire inflation pressures are less than the tires' maximum pressure).
Therefore when checking and adjusting tire inflation pressures, the "right" inflation pressures are those provided by the vehicle manufacturer, not the "maximum" inflation pressure branded on the tire's sidewall. The vehicle manufacturer's pressure recommendation can be found on the vehicle's tire information placard label, as well as in the vehicle owner's manual.
Beginning in 2003, vehicle manufacturers were directed to place tire information placards in a standardized location and follow a common format. The tire information placards identify the Original Equipment tire sizes and inflation pressures (including the spare), along with the vehicle weight capacity.
View Placard at Larger Size

The placard on new vehicles must now be located on the driver's side doorjamb (called the "B-pillar"). If a vehicle does not have a B-pillar, then the placard is to be placed on the rear edge of the driver's door. And if the vehicle does not have a B-pillar and the driver's door edge is too narrow, the placard is to be affixed on an inward facing surface next to the driver's seating position.
In addition to providing the Original Equipment tire size and recommended inflation pressure, vehicle manufacturers must also identify vehicle load capacity with the following sentence: "The combined weight of occupants and cargo should never exceed XXXX pounds."
NOTE: Adhering to this vehicle load capacity information is important. For example, our calculations indicate it would be easy to exceed a five passenger SUV's rated vehicle weight capacity by carrying additional passengers in the vehicle's rear "cargo area" and placing all luggage on a rooftop carrier.
Additionally, new vehicle owner's manuals must also address the following five subject areas: tire labeling, recommended tire inflation pressure, glossary of tire terms, tire care, and vehicle load limits. Vehicle manufacturers can also list alternate tire pressures based on load and/or speed in the owner's manuals.
For vehicles produced between 1968 and 2003, the original tires size(s) and inflation pressures (including the spare) are listed on a vehicle placard (sometimes alternate pressures based on load and/or speed conditions are also provided).
Earlier placards can typically be found on:

• The driver-side door or doorjamb
• Rear passenger doorjamb of Ford sedans
• Fuel filler door
• Glove box or center console door
• The engine compartment

Many manufacturers also list the recommended tire pressure in the vehicle's owner's manual (sometimes along with alternate pressures based on load and/or speed).
One final note, tire pressure must be checked with a quality air gauge as the inflation pressure cannot be accurately estimated through visual inspection.


Bill

FortMorganAl

The tire manufacturer only knows what pressure will ultimately cause premature failure on any vehicle. The vehicle manufacturer knows how much weight will be put on each tire which determines whether the tire tread will run flat, concave, or convex. GM recommends a higher pressure for continuous running higher than 175 mph because they know you are also going to be doing a lot of scrubbing of the inside and outside edges as well as wanting less sidewall flexing and associated heating so they want the tread to be more convex than flat.

duckvett

Bill D & FortMorganAl,
I stand corrected on who provides the recommended tire pressure. Although I was wrong on who provides this info, my advice to the OP is to follow the recommendation given on the door placard & stick with 30 psi.

SUB VETTE

Stick with the Door Sticker numbers for your car.

AORoads

Here's a suggestion for seeking the "real answers" since most of the posts here are not to your liking:

Find a tire, any tire brand and model that is recommended for your car (size, fit, speed rating, load, etc.---you know all that, right?). Call the company, or write to them, and ask them one question: what tire pressure would they recommend for your car----not for your brand of tire independent of any car to put it on?

Your car. X year Corvette, stock wheels (if that's what you have), what tire pressure should I inflate it to?

Simple to do, easy to get an answer, isn't it?

Report back here about the 45, 35, 40 or 51 lbs. of tire pressures they recommend. We'll be here waiting for the answer(s)....

cclive

If you want to listen to the tire manufacturer, that's fine...call them. All of them have 800 numbers and customer service reps to answer questions. Tell them the tire, the car etc and do what they say. That will be a safe way to go. I am completely comfortable with this line of action.

Johnathon59

I don't know about the over inflation issue, just doesn't sound right to me, BUT ! you got 25K on your Goodyears ?? .. mine are almost gone at 8K...

Hameister

Me too!

Entirely comfortable....so much so, that I don't care.

Why should I? The OP can't accept what G.M. says, or what 99% of the responding posts say, or even what common sense dictates.

So... Try 51.5 lbs, see what happens, and let us know.

zero11

I would go by the sticker on the door jam and you will be safe.Changing the pressure to that amount will cause you problems on the street.your car will be bouncing like a ball!