A wet tyre is defined as a tyre which has a land to sea ratio of at least 20% overall, and a minimum ratio of 7% in each third of the section profile.

The tyre may be moulded or hand cut, but each groove must have a minimum depth of three millimetres over 90% of its length. Any tyre with a land to sea ratio of less than 20% will be deemed a slick tyre and therefore must be part of the rider's slick tyre allocation. In case of dispute the decision of the Technical Director will be final.

2.9.4 1) Riders may use only the tyres allocated for his/her exclusive use (as described
in Article 2.9.3).

2) Tyres will be individually identified and may not be exchanged between riders, including between team-mates, and may not be exchanged by the tyre supplier after allocation, except with the permission of the Technical Director (for example, under Article 2.9.8).

3) Tyres may not be materially altered in any way after allocation, such as handcutting and any other action or treatment that will alter the tyre's performance (with the exception of the use of tyre warmers), unless deemed necessary by the tyre supplier. Such alterations may be performed only by the tyre supplier, and shall be made equally for all riders.

2.9.5 Each allocated tyre must be marked with it's specification and carry an official identification label with a unique serial number. In the event of damage to or loss of the official label, the tyre company must be able to satisfy the Technical Director as to the tyre's specification. Tyres may be checked for compliance at any time, before or after use.

2.9.6 In the case of an interrupted race, a rider must use tyres from his allocation of marked tyres for the restarted race.

2.9.7 In the unlikely event of a tyre being accidentally damaged before it is used (for example during the fitting process) and deemed to be unusable by the Technical Director, it may be replaced with a tyre of the same specification with the permission of the Technical Director.

Such replacement tyres will be marked and included in the allocation of the rider concerned. The damaged tyre will be removed from the allocation and may not be allocated again.

2.9.8 Should an exceptional and unpredictable safety problem arise for the tyre supplier during an event, so as to prevent riders from safely competing in the race, then the tyre supplier must inform the Technical Director and Race Direction of the problem as soon as possible.

A re-allocation of suitable tyres may be made under the supervision of the Technical Director. Such allocated tyres will be the same specification(s) and quantities for all riders, the quantity being determined by the tyre supplier in consultation with the Technical Director.

2.9.9 1) For official Post-Race tests of 1 day duration, each rider will be restricted in the quantity and specification of tyres that they may use at a single test event as follows:

During all practice sessions, a maximum of 8 slick tyres, specifically:
Front slick tyres: 2 of Specification “A” + 2 of Specification “B” = 4 in total
Rear slick tyres: 2 of Specification “A” + 2 of Specification “B” = 4 in total

During all practice sessions, a maximum of 4 wet tyres, specifically:
Front wet tyres: 2 of the standard specification
Rear wet tyres: 2 of the standard specification