Document ID: chunk:federal_register_of_legislation:F2018L01518:front:0:p4
Version: federal_register_of_legislation:F2018L01518
Segment Type: other
Provision Reference: 
Character Range: 10334–13174

or structure is primarily designed to achieve in snow conditions a performance better than that of a normal tyre with regard to its ability to initiate or maintain vehicle motion.

2.7. "Special use tyre" means a tyre intended for mixed use both on- and off-road or for other special duty. These tyres are primarily designed to initiate and maintain the vehicle in motion in off-road conditions.
2.7.1. "Professional off-road tyre" is a special use tyre primarily used for service in severe off-road conditions.

2.8. "Structure" of a pneumatic tyre means the technical characteristics of the tyre's carcass.  The following structures are distinguished in particular;

2.8.1. "Diagonal" or "bias-ply" describes a pneumatic-tyre structure in which the ply cords extend to the beads and are laid at alternate angles of substantially less than 90° to the centre line of the tread;

2.8.2. "Bias-belted" describes a pneumatic-tyre structure of diagonal (bias-ply) type in which the carcass is restricted by a belt comprising two or more layers of substantially inextensible cord material laid at alternate angles close to those of the carcass;

2.8.3. "Radial" describes a pneumatic-tyre structure in which the ply cords extend to the beads and are laid substantially at 90° to the centre line of the tread, the carcass being stabilized by an essentially inextensible circumferential belt;

2.8.4. "Reinforced" or "Extra Load" means a pneumatic-tyre structure designed to carry more load at a higher inflation pressure than the load carried by the corresponding standard version tyre at the standard inflation pressure as specified in ISO 4000-1:2010;

2.8.5. "Temporary use spare tyre" means a tyre different from a tyre intended to be fitted to any vehicle for normal driving conditions but intended only for temporary use under restricted driving conditions;

2.8.6. "T-type temporary use spare tyre" means a type of temporary use spare tyre designed for use at inflation pressures higher than those established for standard and reinforced tyres;

2.8.7. "Run flat tyre" or "Self supporting tyre" describes a pneumatic tyre structure provided with any technical solutions (for example, reinforced sidewalls, etc.) allowing the pneumatic tyre, mounted on the appropriate wheel and in the absence of any supplementary component, to supply the vehicle with the basic tyre functions, at least, at a speed of 80km/h (50mph) and a distance of 80km when operating in flat tyre running mode.

2.9. "Bead" means the part of a pneumatic tyre which is of such shape and structure as to fit the rim and hold the tyre on it;[2]/

2.10. "Cord" means the strands forming the fabric of the plies in the pneumatic tyre;2/

2.11. "Ply" means a layer of rubber-coated parallel cords;2/

2.12.  "Carcass" means that part of a pneumatic tyre other than the tread