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Assymetric Tyres
An asymmetric tyre has different tread patterns on its inner and outer sides, giving it a distinct performance advantage over a tyre with a symmetrical or directional tread.
The tread pattern on the inner side of a typical asymmetric tyre has more grooves giving better grip on wet roads
The outer side has a higher plain surface area, the benefit of which becomes apparent when cornering at speed on a dry road.
Unlike a directional tyre, an asymmetric tyre can be used in any position on the vehicle. It is very important however, to follow such wording as 'inside' and 'outside' on the tyre's sidewalls to ensure that the tyre is fitted 'the right way round'. As with directional tyres, incorrect fitment can seriously impair performance. And, again if you do use a wheel with an incorrectly fitted asymmetric tyre, it should be regarded strictly as a 'Temporary spare'. Please note:
A car whose tyres are not fitted in accordance with the instructions on the sidewall will fail its MOT
Some tyres are both asymmetrical and directional. These tyres carry markings on the sidewall which a) indicate the correct direction of rotation and b) identify the inner- and outward-facing sides. Failure to observe these instructions will impair tyre performance. The above recommendations will also apply.
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