RunFlat tyre also called Run On Flat is a fairly new innovation. A
RunFlat is able to work where an ordinary tyre would fail, its main
purpose and attribute are that it can carry on running with no air
pressure. If you did develop a puncture, you can basically carry on
driving without having to pull over and change over to the spare to
wheel. The technology used in the RunFlats allows it to support the
weight of the car, where an ordinary tyre would cripple under force, the
RunFlat would carry on strolling along. There are many cars that are
fitted with RunFlats as standard including many BMWs and Mini's. If you
develop a puncture in a RunFlat, you would still have to repair the
tyre. A RunFlat doesn't seal the puncture. Another key factor is that
although it is claimed that a RunFlat can travel 150km at 80kmh we think
that to avoid any problems you should drive on them as minimum as
possible. It has been observed that the further you run these tyres the
more likely it is that you would damage the tyre beyond repair. Run flat
tyres should not be fitted to cars that do not have some sort of
pressure monitoring system. There are many manufactures now who make
RunFlats and can found in a lot of common car sizes. There is also a
price difference between a run flat and a standard tyre, you can expect
to pay ?20 or more for the equivalent run flat.
Cars fitted with run flats instead of standard tyres
will experience a hard ride this is because runflats have reinforced
beefed up sidewalls that have little flex. There has been some
improvement in some of the new run flats but they will never be as
comfortable as ordinary tyres.
The name says it all, these tyres are able to seal
themselves up if it is punctured. Self Sealing tyres contain an extra
lining which is basically a puncture sealant, this sealant automatically
seals punctures when a bolt or nail pierces through the tread.
Self-sealing tyres are not so common as the Runflats. Most commonly made
and used by Continental, who have named it the Continental Conti Seal.