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) During initial scrutineering, each competitor may have up to forty four dry-weather tyres and thirty six wet-weather tyres for each of his drivers ready for marking in his garage. Tyres not marked during initial scrutineering can be marked at other times by arrangement with the FIA technical delegate.

d) From among the twenty-eight dry-weather tyres chosen for each car for qualifying practice, Warm Up and the race, 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.

e) A competitor wishing to replace an already marked unused tyre by another unused one must present both tyres to the FIA technical delegate.

f) 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.

WEIGHING