How many tyres are permitted per car at each grand prix?
The regulations stipulate that each driver may use a maximum of 40 dry-weather tyres (12 of which may not be used after the first day of practice) and 28 wet-weather tyres throughout the duration of the event. Moreover, each driver may use a maximum of two rubber specifications for his dry-weather tyres during free practice, but he must then choose the rubber specification he wishes to use for the rest of the event before the start of qualifying practice. Every single tyre used at a Grand Prix incorporates an FIA-supplied bar-code so that the scrutineers can check that no driver exceeds the maximum number of tyres allowed. 40.
