coolhandfluke

RUN FLAT TIRES. WHY ?

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friends  Mercedes has Pirelli run flat tires.   well she has a flat. took to the shop and they wont plug or patch.  called 3 other local shops. nope.  because you can drive on it , driving ruins the inners of the side wall.

 

 

However, there is no consensus on whether or not run-flat tires can be repaired. Tire manufacturers often defer to the vehicle manufacturer’s replacement tire restrictions and recommendations.

Michelin North America Inc., for example, allows its run-flat tires (Zero Pressure) to be repaired under certain guidelines. However, repairing the original equipment run-flat tires on a BMW isn’t an option, per its owner’s manual.

 

Run-flat tire repair procedures recommended by the U.S. Tire Manufacturers Association (USTMA) are the same for both run-flat and non-run-flat tires. USTMA does preface that by advising vehicle owners to consult the tire manufacturer for its repair policy and, if applicable, recommended repair procedures.

What the Manufacturers say

When asked if there are any instances where a run-flat tire can be repaired, a Pirelli Tire LLC spokesperson said no, a run-flat should never be repaired.

 

According to Pirelli’s Run-Flat Hazzard Policy, “damaged run-flat tires or run-flat tires that have experienced a loss of pressure should immediately be replaced with another run flat tire of identical size and service description (load index and speed symbol).”

A technical services bulletin from Yokohama Tire Corp. makes it clear Yokohama ZPS run-flat tires are not to be repaired following a puncture “or other tire disablement.”

“ZPS run-flat tires are covered by the Yokohama standard limited warranty that provides for tire replacement under specified conditions,” the bulletin reads. “Your ZPS tire will be replaced on a prorated basis based on remaining tread depth when the tire has been damaged due to a tread area puncture within the repairable area and limits defined by (USTMA).”

Continental Tire the Americas LLC does not recommend any repair to Continental SSR (Self Supporting Runflat) tires. The company’s explanation is as follows: “Even a trained tire specialist may be unable to recognize internal structural damage to a Self Supporting Runflat (SSR) tire resulting from having been driven in an under inflated or zero pressure condition. Such damage may not be visible on the surface of the inner liner or sidewall, making it impossible to determine the tire suitability for repair. Continental does not recommend any repair to Continental SSR tires. Note: Continental advises if a tire is returned under complaint and reason for the product’s disablement is in any way associated with a repair or the reason for repair, the manufacturer’s warranty is invalidated.”

“Repairs of run-flats are a major concern,” says Chris Davis, Continental’s technical product service manager. “Always refer to the tire manufacturer’s recommendations on repairs as it can vary by manufacturer. Some allow a repair, some don’t and some allow multiple repairs, noting that each repair lowers the speed rating of the tire.  Consider your dealership’s liability as the ‘tire expert’ agreeing the tire is not damaged, should you repair the tire without knowing damage between the layers.

“Run-flat tires, by design, have a very thick, stiff compound in the sidewall,” he said. It is typically not the same material that you can visualize on the inside or outside of the tire. If there is a separation between those layers, the dealer and the customer may not know about the condition until the tire has a second incident of low pressure causing the run flat tire not to work as designed, leaving the customer stranded on the highway or worse, having a rapid air loss and instability of control.  

 

Edited by coolhandfluke

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Why?

Because they're sold to people that don't know how to change a tire or even plug one.

Heck, many don't even know how to put air in a tire, let alone where to get said air?

 

It always sounded like a product that was designed with failure in mind.

Sure, all tires will eventually either need a repair or replacement. But would you want to pay a lot more for a tire that cannot be repaired?

 

As we're all fond of thinking, "Must be nice to have money to throw away like that."

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Sounds like a gimmick to just buy another tire from the manufacturer. 

 

The manufacturer would loose $$$ if everyone continued to repair their runflats.

 

I've used them tire plug repair kits on the runflats on my BMW and they hold air and drive fine.

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Waste of money . . . took them off, replaced with real tires and will put them back on when it's time to return vehicle.  Biggest crock of crap going, and they only get about 20k miles.

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My understanding is that they can't be repaired because they may be run at higher speeds for extended periods of time with a flat, which may/will compromise the integrity of the plies. 

 

Makes sense to me. Would you trust a patched run-flat tire on a vehicle carrying your family at highway speeds in August? I wouldn't. 

 

FYI, run-flat tires are standard in vehicles with no spare tire, for example a Mini Cooper. 

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I'd like these for my wife.  I always tell her that if she gets a flat, keep driving until you get off the highway.  Bend the rim, I don't care. We will get a new rim.  With this, just get a new tire. Who gives a ****? Better than becoming a highway fatality. 

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16 mins ago, Patrick9915 said:

I'd like these for my wife.  I always tell her that if she gets a flat, keep driving until you get off the highway.  Bend the rim, I don't care. We will get a new rim.  With this, just get a new tire. Who gives a ****? Better than becoming a highway fatality. 

This^^^
 

Wife’s Honda van has them and as much as I hate the van and the price of the tires I’m glad she won’t be stuck with a flat tire.

Van is a 2005 with 200k miles that she refuses to get rid of. Don’t know how many sets of tires it’s been through but never had one that needed repair.

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30 mins ago, Patrick9915 said:

I'd like these for my wife. 

this^^^^ If the wife gets a flat on the road in the middle of the night at least she'll be able to drive somewhere safe before pulling over......the bitch can't even put air in her tires let alone change a flat.

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hmm.  my wife can change a flat tire and did once.  I always keep a small floor jack in her car.  1/2 drive socket wrench and correct socket attached and a piece of pipe to use as a breaker bar.

my daughter was taught also and she carries the same tools.   we have aaa but if your in a hurry...…………..

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11 mins ago, coolhandfluke said:

hmm.  my wife can change a flat tire and did once.  I always keep a small floor jack in her car.  1/2 drive socket wrench and correct socket attached and a piece of pipe to use as a breaker bar.

my daughter was taught also and she carries the same tools.   we have aaa but if your in a hurry...…………..

^^^^This. Also less of a target sitting off to side of road or parking lot for period of time while waiting for AAA service.My girl knows how to change a spare and start her own car with dead battery from lithium battery pack i gave her for her birthday,lol. Sooner they're underway,less opportunity for some scumbag to come along and prey on them.

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33 mins ago, coolhandfluke said:

hmm.  my wife can change a flat tire and did once.  I always keep a small floor jack in her car.  1/2 drive socket wrench and correct socket attached and a piece of pipe to use as a breaker bar.

my daughter was taught also and she carries the same tools.   we have aaa but if your in a hurry...…………..

I have a breaker bar from Harbor Freight. 

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Had a friend that died many years ago while changing a flat on the side of the highway.. Figure there's about an exit per mile down here so I'm getting off the road to change the flat

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