What is Run Flat tire? How it works, pros and cons!

You ever heard of run flat tires? This technology is recent, and has gradually come in more car models. But what is Run Flat tire? Discover with us!

You ever heard of run flat tires? This technology is recent, and has gradually come in more car models. But is the flat run tire good? and how does run flat work? Understand everything about this tire!

What are run flat tires?

What is the greatest vulnerability of the tire? punctured. Would not it be great if the tire manufacturers got a way that the tire could hold up for some time, even stuck? This is the idea of ​​the origin of run flat tires.

The run flat is a type of tire that can run for some time, even if it has bored.

flat tire


Because this technology is new, it is still limited. That is, it was not this time that they created an eternal tire, which can be totally punctured. The flat run is prepared for damage to the base of the tire – you will see below that side tears are the fragility of the run flat.

How run flat tire work?

The run flat looks like it’s a normal tire. Your innovation is stored inside.

The flat run tire uses air like any other tire. The difference of the run flat tire for ordinary tires is that it has a rubber reinforcement on its side. So, when it’s bored and tire air is running out, the reinforced tire walls hold the car rolling for some time, until you can do the replacement.

tire punched

Some run-flat models have a reinforcement in the middle of the tire, providing even more support if puncture.

Normally, this tire can withstand safely more than 50 miles after the damage (at a limited speed of 50 miles/h), even if it loses its pressure. It is important to stick to the limits, or you run the risk of great harm – and put your safety at risk.

Every company has a name for this tire, but they all work the same way. Pirelli calls it Run Flat, Bridgestone calls it RFT, and Michelin calls it PAX.

Advantage of run flat tires

Not having to replace a tire in dangerous or unfavorable conditions is the greatest benefit of run-flat tires. Unlike conventional tires, where the driver has to replace a tire or have the car towed.

tire punched

Run-flats also provide additional security. In a drilling situation, they are more stable than conventional tires. These tires support the vehicle even when they are not full, so even after the bore the steering remains steady.

Another advantage is that cars do not need a spare tire. It frees space in your trunk, and you can get rid of those awkward tools. The weight of the car also reduces without the spare tire. But run-flat tires are heavier than normal, so it does not change much.

Disadvantages of run flat tires

Not everything is flowers: there are disadvantages to having run-flat tires.

First, the cost. Run-flats are 30% more expensive and can not be combined with traditional tires. Manufacturers do not recommend combining run-flat tires and standard tires in the same vehicle, even if paired in axle sets. Only in exceptional and emergency circumstances, for a very limited period and distance.

Important: Tire manufacturers do not recommend replacing all four run-flats with conventional tires. They warn that the original design of the vehicle, suspension and safety calibrations were not designed using run-flats.

Continental ContiSport Contact

When buying another run flat tire to buy, further problem: Since run-flats do not sell much (few cars can use this type of tire), drivers may find it difficult to find new flat run tires, especially in smaller cities. Some sizes and brands are still hard to find.

The durability of the flat run tire is not the same as a regular tire. JD Power’s consulting firm reported that consumers replace their run-flat tires an average of 6,000 miles earlier than conventional tire owners.

It is unclear why run-flats wear out faster, but the likely theory is the softer tread compound on the run-flat tires, compensating for the more reinforced sides. The softer rubber results in shorter tire life.

The fuel consumption also changes running with run flats. The reinforcements add weight to the tires, increasing fuel consumption by between 1% and 2%.

The stiffer sides of the tire cause a tougher direction. The car manufacturers make it easier to adjust the suspension to compensate for the tougher tire. However, it is common to hear complaints from consumers.

The cars that can use flat run tire have a sensor called TPMS, which monitors tire pressure. If the driver ignores the TPMS warning and drives beyond a zero-pressure tire, or above the set speed limit, the run-flat tire may disintegrate.

TPMS sensor light

Side damage and impact damage also affect run-flats, much like conventional tires.

Many customers have not adapted to these tires. There have been lawsuits against BMW and Honda because of low durability, and high replacement costs. Consumers running run flat are generally less satisfied with their tires compared to drivers running on conventional tires.

Various specialists and specialist publications advise that run-flat does not make up for the hassle or expense. They say these tires still do not offer enough advantages to make up for all those points against.

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