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Tyre terms explained

Aspect ratio

The ratio of a tyre's width in relation to its height. An aspect ratio of 65 (65:1) indicates that the height of the tyre is equal to 65% of its width. 

Bead

The edge of the tyre which sits on the wheel.

Kevlar  

The registered trademark for a synthetic fibre developed in 1965, used as a component in tyres.

Load index

A number which corresponds to the maximum load, in kilograms, that a tyre can support when properly inflated.

Pneumatic tyres

Tyres comprised of a flexible materieal, such as rubber, and reinforcing materials such as wire.

Sidewall

The part of the tyre between the tread and the bead.

Silica

A chemical compound, also known as silicone dioxide. It is added to the rubber in tyres.

Tread

The raised rubber section of the tyre that makes contact with the road.

Tyre type

Defines the vehicle for which the tyre is designed. “P” indicates a tyre for a passenger car, “LT” for a light truck.

Tyre width

The width of the tyre, in millimetres, from sidewall to sidewall across the bead.

Wheel diameter

The width of the wheel across its face.

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