Run-flat systems have been around for a number of years in many
different forms. Over the years tyre manufacturers have adopted
several different systems but all with one goal in mind - vehicle
Most motorists will, at one time or another, suffer the
inconvenience of a tyre puncture.
There are inherent dangers associated with changing a wheel at the
roadside, particularly if the puncture occurs on a freeway where
the work has to be carried out on the road shoulder, where possible
motorists need to avoid the risk of being stranded.
Whilst a puncture is usually more of an inconvenience and
unwanted expense, the dangers involved with a tyre failure at high
speed are far more serious - the greatest danger being a complete
loss of control of the vehicle. This occurs when the sidewall of
the tyre, which is usually kept secure against the wheel by the
internal air pressure, becomes separated and drops into the well of
Run-flat tyres are designed to keep the all parts of the tyre
secure and where they need to be - even when operating at zero
Run-flat tyre systems can also generally be split into two
separate categories - those incorporating a significantly
strengthened sidewall, and those that use an internal support ring
that is mounted on the inside of the wheel rim.
Both systems will, subject to distance limitations, allow the
motorist to continue their journey without having to stop and
replace the punctured tyre.
The other essential item of safety equipment for a vehicle with
run-flat tyres is a Tyre Pressure Monitoring System (TPMS).
Run-flat tyres are designed to minimise the difference in ride
quality when a tyre is punctured. This is especially the case with
freeway driving where there is relatively little cornering. For
this reason it is difficult to determine whether a tyre has lost
pressure or is operating in zero pressure conditions. Should the
driver not be aware of a loss of pressure they may well exceed the
safety limits imposed by the manufacturer.
There are a range of Run Flat Tyres which are deemed not
repairable by the tyre manufacturer. If you are unsure, please
check with your local T-Mart as to the specific manufacturer
recommendations for your Run Flat Tyres.