There’s one main advantage of tyres to name upfront: You can keep on driving, even with a puncture. That’s not to say that you can use them forever. They will still lose pressure over a certain distance after being punctured. In this case they should only run for 50 miles (about 80 kilometres) at a maximum speed of 50 mph (about 80 km h).
But then how do you realize that you’re losing pressure? Tyres are only permitted when your car has a tyre pressure monitoring system (TPMS). This system will let you know when the pressure is decreasing. Run-flat tyres are available as two constructional variants: a self-supporting construction and one with a supportive ring. Their differences are:
- Self-supporting: Reinforced sidewalls to support the weight of your car, even when the tyre has been punctured.
- Supporting ring: An additional ring made of rubber or something similar is within the tyre to support your car.
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