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Sporting regs 2000 wrote:79) Quantity and type of tyres :
a) The same driver may not use more than a total of thirty two dry-weather tyres and twenty eight wet-weather tyres throughout the entire duration of the Event.
Prior to the qualifying practice each driver may use two specifications of dry-weather tyres but must, before qualifying practice begins, nominate which specification of tyre he will use for the remainder of the Event.
For qualifying practice, Warm Up and the race each driver may use no more than twenty eight tyres (fourteen front and fourteen rear).