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Monday 21 April 2014 • 07:05 GMT • Last update 16:46

Prime tyre

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In Formula 1 racing, the prime tyre is the harder of the two tyre compounds available to the teams during a race weekend.

Because prime tyres have a softer, grippier compound they generally last longer than option tyres, but do not produce lap times which are as fast. However, the effect varies with the track layout and temperature.

During a dry-weather race, drivers are required to use both prime and option tyres. The rule does not apply in wet-weather races, when wet tyres are used.

See also option tyre

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