NON Run Flat tires
Team Owner
Joined: Sep 2000
Posts: 25,001
Likes: 2,700
From: Far NW 'burbs of Chicago
St. Jude Donor '13
I have a 2016 stingray with Michelin runflats. Last weekend was the first time ever I took it on the NYS Thruway for 50 mi each way. It started off a little jittery but as the wore on, I'm not sure if the car actually got more jumpy, or if the road was getting worse, or i was just noticing it more. At the end of the day I saw my pressures had uniformly risen from 34 to 39. I promised my wife I'd look into michelin non runflats, but most say no difference to smooth the ride. And no claim there's a pressure difference between the two tires. So probably not worth the $$$ to check it out....even for my wife! 
Later, GM people admitted that 35 psi cold gave a harsher ride, poorer handling, and more tire wear. All bad and no good, unless you were GM trying to impress the Feds.
Our Owner Manual does recommend higher pressures for sustained high speed driving, we should be so lucky as to have that problem.
Intermediate
Joined: Jul 2004
Posts: 29
Likes: 4
From: Rochester, Ny
The recommended tire pressure for all years/models of C7, is 30 psi cold in the morning- except for a short time when they increased the official pressure to 35 psi cold but changed nothing else. That was an evil trick to get another 1/100 (?) MPG on the fuel economy tests.
Later, GM people admitted that 35 psi cold gave a harsher ride, poorer handling, and more tire wear.
Later, GM people admitted that 35 psi cold gave a harsher ride, poorer handling, and more tire wear.
Much thanks my friend!
Team Owner
Joined: Sep 2000
Posts: 25,001
Likes: 2,700
From: Far NW 'burbs of Chicago
St. Jude Donor '13
^^^^^
There is an error in my previous post- I'm told the cars that got the 35psi door sticker also got the tire pressure warning recalibrated. Instead of the Low Pressure warning coming on at about 25 psi, it was set to come on at about 30 psi. So if your tires are set at 30, you may get the warning when you first start up on a cool morning.
The warning may or may not effect things like stability/traction control, etc. Those problems should disappear once the pressure gets above 30 as you drive.
And of course, other things can cause the issues mentioned in post #1.
Let us know what you learn!
There is an error in my previous post- I'm told the cars that got the 35psi door sticker also got the tire pressure warning recalibrated. Instead of the Low Pressure warning coming on at about 25 psi, it was set to come on at about 30 psi. So if your tires are set at 30, you may get the warning when you first start up on a cool morning.
The warning may or may not effect things like stability/traction control, etc. Those problems should disappear once the pressure gets above 30 as you drive.
And of course, other things can cause the issues mentioned in post #1.
Let us know what you learn!
Le Mans Master
Joined: Jun 2004
Posts: 7,155
Likes: 154
From: The Arid Sunny Desert
I just came from a Discount Tire and utilized their free air check. The pressures on my '14 Stingray were all over the place: 27psi, 31psi, 32psi, 30psi and the tires were warm to hot!! I threw the tech $5 and asked him politely to set all 4 tires to 35psi while they are warmed up. I immediately felt the difference in terms of a harsher ride however I expect them to drop psi when they cool down. Will check them again when the weather cools down in the desert. We are still at 100 degrees during the day.
Intermediate
Joined: Jul 2004
Posts: 29
Likes: 4
From: Rochester, Ny
To come back to topic again, not worth trying a non run-flat to see if it'd make a difference, given the consensus that it probably would not.
