Run flat tyre systems have been around for some years and manufacturers have adopted them for one reason and one reason only: vehicle safety.
They are capable of supporting a vehicle's weight, even at zero pressure, and as the driver might not recognise that one tyre is operating at zero pressure, a pressure monitor system is installed, warning the driver immediately if air loss occurs.
One area of particular interest is the question of repairs to run flat tyres. At the moment the majority of the tyre manufacturers do not recommend a run flat tyre be repaired following operation at reduced pressure. When a standard tyre is punctured and runs at reduced or zero pressure it will suffer damage to the sidewall that will render it unfit for repair and re-use. This damage is easily spotted once the tyre is removed and is usually seen as a creasing to the inner liner of the tyre in the sidewall area. This creasing indicates that damage has occurred to the internal construction of the tyre and further use could result in casing failure.
Due to its heavily reinforced sidewall construction a run flat tyre will not exhibit these signs and there may be internal damage that cannot be seen. A run flat tyre will undergo a great deal of stress while operating in a zero pressure situation and will therefore be subject to greater stresses than a standard tyre. The actual tyre does not carry the weight of the vehicle it is the pneumatic effect of the air inside the tyre that carries the weight.
For more information about run flat tyres, get in touch
with Queens Park Tyres today.