RUN-FLAT TYRES

Fast Ford - - All About… Tyres -

Many mod­ern cars come with run-flat tyres from the fac­tory. Un­sur­pris­ingly, th­ese do ex­actly as their name sug­gests, and al­low the tyre to be driven for a lim­ited amount of time with no air pres­sure to in­flate them. This is great news if you get a punc­ture, as it means you can drive the car di­rectly to the garage to have the tyre re­placed with­out be­ing left stricken at the road­side. How­ever, run-flats are not very pop­u­lar among en­thu­si­asts, be­cause they fea­ture ex­tremely stiff and rigid side­walls. The side­walls need to be strong enough to sup­port the weight of the car if the tyre is de­flated, and as a re­sult they can prove quite un­com­fort­able, giv­ing a crashy and bumpy ride. The re­duced flex in the side­wall also ham­pers per­for­mance ( re­mem­ber, it’s the move­ment of the rub­ber and the way it in­ter­acts with the road sur­face that gives us grip) so are of­ten best used on cars cov­er­ing lots of mo­tor­way miles, where the con­ve­nience of not hav­ing to re­place the tyre at the road­side out­weighs the per­for­mance dif­fer­en­tial.

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