78) Supply of tyres :
a) Any tyre company wishing to supply tyres to Formula One Teams must notify the FIA of its intention to do so no later than 1 January preceding the year during which such tyres will be supplied. Any tyre company wishing to cease the supply of tyres to Formula One Teams must notify the FIA of its intention to do so no later than 1 January of the year preceding that in which such tyres were to be supplied.
b) No tyre may be used in the Championship unless the company supplying such tyre accepts and adheres to the following conditions :
- one tyre supplier present in the Championship : this company must equip 100% of the entered teams on ordinary commercial terms ;
- two tyre suppliers present : each of them must, if called upon to do so, be prepared to equip up to 60% of the entered teams on ordinary commercial terms,
- three or more tyre suppliers present : each of them must, if called upon to do so, be prepared to equip up to 40% of the entered teams on ordinary commercial terms,
- each tyre supplier must undertake to provide only two specifications of dry-weather tyre and three specifications of wet-weather tyre at each Event, each of which must be of one homogenous compound only,
- if, in the interests of maintaining current levels of circuit safety, the FIA deems it necessary to reduce tyre grip, it shall introduce such rules as the tyre suppliers may advise or, in the absence of advice which achieves the FIA's objectives, specify the maximum permissible contact areas for front and rear tyres.
79) Quantity and type of tyres:
a) During the Event no driver may use more than forty dry-weather tyres and twenty eight wet-weather tyres. From the forty dry-weather tyres each driver will be allocated twelve (six front and six rear) for use on the first day of practice, these tyres may not be used at any other time during the Event. No more than eight (four front and four rear) of the twelve tyres allocated for the first day of practice may be of one specification.
Before qualifying practice begins each driver must nominate which specification of tyre he will use for the remainder of the Event.
b) All dry-weather tyres must incorporate circumferential grooves square to the wheel axis and around the entire circumference of the contact surface of each tyre.
c) Each front dry-weather tyre, when new, must incorporate 4 grooves which are:
- arranged symmetrically about the centre of the tyre tread,
- at least 14mm wide at the contact surface and which taper uniformly to a minimum of 10mm at the lower surface,
- at least 2.5mm deep across the whole lower surface,
- 50mm (+/- 1.0mm) between centres. Furthermore, the tread width of the front tyres must not exceed 270mm.
d) Each rear dry-weather tyre, when new, must incorporate 4 grooves which are:
- arranged symmetrically about the centre of the tyre tread,
- at least 14mm wide at the contact surface and which taper uniformly to a minimum of 10mm at the lower surface,
- at least 2.5mm deep across the whole lower surface,
- 50mm (+/- 1.0mm) between centres. The measurements referred to in c) and d) above will be taken when the tyre is fitted to a wheel and inflated to 1.4 bar.
e) A wet-weather tyre is one which has been designed for use on a wet or damp track. All wet-weather tyres must, when new, have a contact area which does not exceed 280cm² when fitted to the front of the car and 440cm² when fitted to the rear. Contact areas will be measured over any square section of the tyre which is normal to and symmetrical about the tyre centre line and which measures 200mm x 200mm when fitted to the front of the car and 250mm x 250mm when fitted to the rear. For the purposes of establishing conformity, only void areas which are greater than 2.5mm in depth will be considered. Prior to use at an Event, each tyre manufacturer must provide the technical delegate with a full scale drawing of each type of wet-weather tyre intended for use. With the exception of race day, wet-weather tyres may only be used after the track has been declared wet by the race director and, during the remainder of the relevant session, the choice of tyres is free.
f) Tyre specifications will be determined by the FIA no later than 1 September of the previous season. Once determined in this way, the specification of the tyres will not be changed during the Championship season without the agreement of the Formula One Commission.
80) Control of tyres :
a) All tyres which are to be used at an Event will be marked with a unique identification.
b) At any time during an Event, and at his absolute discretion, the FIA technical delegate may select the dry-weather tyres to be used by any Team from among the total stock of tyres which such Team's designated supplier has present at the Event.
c) From among the twenty-eight dry-weather tyres available to each driver following the first day of practice, the FIA technical delegate will choose at random sixteen tyres (eight front and eight rear) which are the only dry-weather tyres which such car may use in qualifying practice.
d) A competitor wishing to replace one unused tyre by another unused one must present both tyres to the FIA technical delegate.
e) The use of tyres without appropriate identification is strictly forbidden.
81) Wear of tyres:
The Championship will be contested on grooved tyres. The FIA reserve the right to introduce at any time a method of measuring remaining groove depth if performance appears to be enhanced by high wear or by the use of tyres which are worn so that the grooves are no longer visible.
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