<<< back

Tires

Studded tyres is authorized.

The requirement to the studs used in tyres:

• weight of a stud shall not be more than 4 grams ;
• length of a stud shall not be more than 20 mm;
• number of studs should not exceed 24 pieces per 10 linear cm of the wheel rolling surface;
• maximum projecting of a stud above the tyre running track surface (“incomplete studding”) is not limited;
• the studs’ shape and geometrical size are not limited except those, shown in the Figure below.

Method of check of the studs:

• Studs will be counted on a 30-cm site, using a template, on the tyre surface not being deformed by the vehicle weight impact. The template length should be 30 cm, and inside the template not more than 72 studs are to be placed.
• If necessary, measurements of height of the working part and stud head size are performed. The necessary number of studs can be extracted from tyres for checking of all the parameters, but just after completion of the competition, and before the Event completion the tyres should be marked.

Conditions on use of the studs:

• Complete wheels of one axis of the vehicle should be identical. Including, it concerns such as studs, type studding and figure of a protector.
• The way of fixing of studs in the tyre is not limited, however, the stud cannot move in a landing aperture, that is fixing should be rigid.
• Installation of any bodies in a landing aperture of a stud is forbidden. The tyre should be safe, that is it should not have damages which can entail causing of harm to the third parties, or to their property.
• Studding of tyres should be uniform on all circle of a wheel. It means that the minimal number of studs per 10 linear cm of length of a circle of a wheel cannot make less than 50 % from the maximal number of studs per 10 linear cm on the tyre.
• The axis of the stud fixed in the tyre, should be perpendicular surfaces of a protector in an installation site of a stud (a deviation from perpendicularity no more than 15 degrees).

For all crews (including crews of drivers on the FIA priority list) it is resolved during the event replacement studded tyres to ordinary (non-studded) for road sections.