Why Run Flat Tires ??
Thread Starter
Race Director
Joined: Oct 2004
Posts: 10,516
Likes: 2
From: Virginia Bch VA
Cruise-In VI Veteran
Cruise-In VII Veteran
St. Jude Donor '06
Why Run Flat Tires ??
OK we don’t have a spare. Dealer told me that loss of air pressure means no more than 55 mph for 50 miles. After that, loss of the tire is expected. Which means that unless you’re in a war zone, you stop when you get a flat and call for help. So why the Run Flats? From what little I know:
1. Run Flats add $100 per tire. And more important:
2. Add weight. I’ve been told that “un-sprung weight” is bad – bad.
3. Make sense that a non-run flats have a more flexible sidewall – thus handle better.
So when it’s time to buy why not get regular tires and carry a can of Fix-a-Flat??
I'm posting on the C-5 board too.
Will use of Fix-a-Flat damage the pressure sensor inside the tire?
1. Run Flats add $100 per tire. And more important:
2. Add weight. I’ve been told that “un-sprung weight” is bad – bad.
3. Make sense that a non-run flats have a more flexible sidewall – thus handle better.
So when it’s time to buy why not get regular tires and carry a can of Fix-a-Flat??
I'm posting on the C-5 board too.
Will use of Fix-a-Flat damage the pressure sensor inside the tire?
☠☣☢ Semper Ebrius ☢☣☠
Joined: Jun 2001
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From: Virginia
Cruise-In IV-V-VI-VII Veteran
St. Jude's Donor '06
Originally Posted by JFTaylor
1. Run Flats add $100 per tire. And more important:
2. Add weight. I’ve been told that “un-sprung weight” is bad – bad.
3. Make sense that a non-run flats have a more flexible sidewall – thus handle better.
So when it’s time to buy why not get regular tires and carry a can of Fix-a-Flat??
Fix a flat, as I found out first hand, can be damn near useless.
Will use of Fix-a-Flat damage the pressure sensor inside the tire?
Le Mans Master
Joined: Feb 1999
Posts: 7,121
Likes: 0
From: Vilano Beach FL
Howdy!
The "next gen" runflats seem to offer much better overall performance. I consider a runflat a "street" tire anyway, where the limits of a runflat are still way beyond what you should be doing on public roads.
To be honest, I really don't like driving a vehicle that doesn't have either 1) a conventional spare or b) runflats. You might notice from my sig I drive a Z06 which has neither. I plan on going to some Michelin runflats very soon (SRT Viper OEM's in fact). (I'll keep my CCW 18's as dedicated track wheels/tires)
I agree 101% with the "...you don't want to get stuck in..." comment, especially when we take the Vette on a road trip. I know there's always AAA, but I'd prefer not to me left waiting, especially if the wifey is with me, in a "bad situation". (There's always the combo of AAA+S&W but that's another whole can of worms
)
I firmly believe the slight performance penalty is offset by all the safety benefits. FWIW, I've read a number of stories of people driving much farther than 50 miles on an EM type tire, YMMV of course.
The "next gen" runflats seem to offer much better overall performance. I consider a runflat a "street" tire anyway, where the limits of a runflat are still way beyond what you should be doing on public roads.
To be honest, I really don't like driving a vehicle that doesn't have either 1) a conventional spare or b) runflats. You might notice from my sig I drive a Z06 which has neither. I plan on going to some Michelin runflats very soon (SRT Viper OEM's in fact). (I'll keep my CCW 18's as dedicated track wheels/tires)
I agree 101% with the "...you don't want to get stuck in..." comment, especially when we take the Vette on a road trip. I know there's always AAA, but I'd prefer not to me left waiting, especially if the wifey is with me, in a "bad situation". (There's always the combo of AAA+S&W but that's another whole can of worms
)I firmly believe the slight performance penalty is offset by all the safety benefits. FWIW, I've read a number of stories of people driving much farther than 50 miles on an EM type tire, YMMV of course.
Melting Slicks
Joined: Aug 2000
Posts: 2,568
Likes: 0
From: Miami Fl
The C5 Z06 and previous generation BMW M5 had standard tires with what was basically a "fix-a-flat" bottle and a cigarette lighter operated mini-air pump.
I want to replace my tires with Nittos or GY Super Car tires.
I want to replace my tires with Nittos or GY Super Car tires.
Racer
Joined: Oct 2004
Posts: 366
Likes: 0
From: Sunnyvale CA
JFT...great post...
Here's my theory. It starts with the notion that in the world of Physics/Engineering there is no magic just real world tradeoffs.
No one liked the super stiff sidewalls of the early runflats.
Now we have these newer runflats that will not go as far but have a more compliant sidewall.
Guess what, if I soften the sidewall and make it more like a regular tire...guess what I get?? ---a regular tire! They haven't gone quite that far but you get the idea...
Here's my theory. It starts with the notion that in the world of Physics/Engineering there is no magic just real world tradeoffs.
No one liked the super stiff sidewalls of the early runflats.
Now we have these newer runflats that will not go as far but have a more compliant sidewall.
Guess what, if I soften the sidewall and make it more like a regular tire...guess what I get?? ---a regular tire! They haven't gone quite that far but you get the idea...
Drifting
Joined: Mar 2003
Posts: 1,569
Likes: 0
From: Carolina
Originally Posted by JFTaylor
OK we don’t have a spare. Dealer told me that loss of air pressure means no more than 55 mph for 50 miles. After that, loss of the tire is expected. Which means that unless you’re in a war zone, you stop when you get a flat and call for help. So why the Run Flats? From what little I know:
1. Run Flats add $100 per tire. And more important:
2. Add weight. I’ve been told that “un-sprung weight” is bad – bad.
3. Make sense that a non-run flats have a more flexible sidewall – thus handle better.
So when it’s time to buy why not get regular tires and carry a can of Fix-a-Flat??
I'm posting on the C-5 board too.
Will use of Fix-a-Flat damage the pressure sensor inside the tire?
1. Run Flats add $100 per tire. And more important:
2. Add weight. I’ve been told that “un-sprung weight” is bad – bad.
3. Make sense that a non-run flats have a more flexible sidewall – thus handle better.
So when it’s time to buy why not get regular tires and carry a can of Fix-a-Flat??
I'm posting on the C-5 board too.
Will use of Fix-a-Flat damage the pressure sensor inside the tire?
Will the C6 Z06 have run-flats also?
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Team Owner
Joined: May 2004
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From: McKinney TX
St. Jude Donor '21-'22-'23-'24
Originally Posted by JFTaylor
Dealer told me that loss of air pressure means no more than 55 mph for 50 miles. After that, loss of the tire is expected?
Drifting
Joined: Mar 2003
Posts: 1,569
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From: Carolina
Originally Posted by Scissors
Yes.
If the new Z06 wants to outhandle its main competitors it has to use regular tires.......
I can accept GM using Run-flats in the base C6 but in the Z06 no......
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From: Virginia
Cruise-In IV-V-VI-VII Veteran
St. Jude's Donor '06
Originally Posted by ivan111
So that means that there is going to be a grip or handling compromise in the new Z.....
As long as it kicks the crap out of the competition, I don't care. Besides, with the short sidewalls such large wheel diameters bring, a runflat's stiffer sidewall has a minimal effect on handling and grip. Compound and tread pattern matters far more.
Drifting
Joined: Mar 2003
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From: Carolina
Originally Posted by Scissors
Any car that doesn't come with drag radials has a grip or handling compromise.
As long as it kicks the crap out of the competition, I don't care. Besides, with the short sidewalls such large wheel diameters bring, a runflat's stiffer sidewall has a minimal effect on handling and grip. Compound and tread pattern matters far more.
As long as it kicks the crap out of the competition, I don't care. Besides, with the short sidewalls such large wheel diameters bring, a runflat's stiffer sidewall has a minimal effect on handling and grip. Compound and tread pattern matters far more.
Base C6 is 40 at front and 35 at the rear
C6 Z06 is 35 at front and 30 at the rear...
Is that correct?
☠☣☢ Semper Ebrius ☢☣☠
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From: Virginia
Cruise-In IV-V-VI-VII Veteran
St. Jude's Donor '06
Originally Posted by ivan111
I read that the C6 Z06 sidewalls are going to be lower profile that the base C6?
Base C6 is 40 at front and 35 at the rear
C6 Z06 is 35 at front and 30 at the rear...
Is that correct?
Base C6 is 40 at front and 35 at the rear
C6 Z06 is 35 at front and 30 at the rear...
Is that correct?
Drifting
Joined: Mar 2003
Posts: 1,569
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From: Carolina
Originally Posted by Scissors
C6 Z06 rear tires:
Somebody also said that the Z06 tires speed rating is Y that is up to 186 mph so the Z06 top speed should be identical to the base C6?
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From: Virginia
Cruise-In IV-V-VI-VII Veteran
St. Jude's Donor '06
Originally Posted by ivan111
Rears are 325 not 345 like i have been hearing.....
Somebody also said that the Z06 tires speed rating is Y that is up to 186 mph so the Z06 top speed should be identical to the base C6?
Somebody also said that the Z06 tires speed rating is Y that is up to 186 mph so the Z06 top speed should be identical to the base C6?
But all of the good intel I've heard is that they're 325s. I don't know where this 345 stuff came from.
Drifting
Joined: Mar 2003
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From: Carolina
Originally Posted by Scissors
It's possible that these are an optional tire for the Z06.
But all of the good intel I've heard is that they're 325s. I don't know where this 345 stuff came from.
But all of the good intel I've heard is that they're 325s. I don't know where this 345 stuff came from.
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From: Virginia
Cruise-In IV-V-VI-VII Veteran
St. Jude's Donor '06
Originally Posted by ivan111
What about the tires speed rating?
But Y rated tires are good only up to 186. Z rated is good for 155+ (leaves a lot of leeway.)
Drifting
Joined: Mar 2003
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From: Carolina
Originally Posted by Scissors
I have no idea.
But Y rated tires are good only up to 186. Z rated is good for 155+ (leaves a lot of leeway.)
But Y rated tires are good only up to 186. Z rated is good for 155+ (leaves a lot of leeway.)
☠☣☢ Semper Ebrius ☢☣☠
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From: Virginia
Cruise-In IV-V-VI-VII Veteran
St. Jude's Donor '06
Originally Posted by ivan111
From the C6 Z06 and C6R pic you can see the tire Y speed rating, if that is true or not will have to wait until january......
Yeah...could be an option.
Edit: The close up of the yellow car's wheel and tire shows P275/35ZR18 on the front.