They tend to be more expensive than traditional tires, and because of their extra weight and bulk, they can negatively impact fuel economy. While run-flat tires are certainly convenient, they’re not perfect. This support structure is usually supplemented by thicker sidewalls and/or extra layers of rubber or other material. The answer depends on the specific design, but most run-flat tires have some sort of internal support structure (usually made of steel or Kevlar) that helps keep the shape of the tire and prevents it from collapsing flat. Second, because they don’t require inflation, they’re often used on vehicles with very low ground clearance (like sports cars) where a traditional spare tire would be too bulky. There are several benefits to using run-flat tires.įirst, they allow you to continue driving even after a puncture, which can be helpful if you’re far from home or a service station. The term “run-flat” generally refers to tires with reinforced sidewalls that can support the weight of the vehicle even when there is no air pressure in the tire. Run-flat tires are used on many high-performance vehicles, as well as some SUVs and trucks.Ī run-flat tire is a type of tire that can continue to be used even after sustaining puncture damage. This design allows the driver to continue driving for a short distance after a puncture, as opposed to having to stop immediately and change the tire. The reinforcement can be made from steel, Kevlar, or other materials, and is located between the tread and inner liner of the tire. Inside a run-flat tire is a reinforced sidewall that is designed to support the weight of the vehicle in the event of a puncture.
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