load capacity index — a number associated to the maximum load rating of the tyre in relation to the definition in paragraph 2.28 of UNECE Regulation No 30 for class C1 tyres and paragraph 2.27 of UNECE Regulation No 54 for class C2 and C3 tyres (17)

maximum load rating — the mass which a tyre can carry when operated in conformity with requirements governing utilisation specified by the tyre manufacturer (18)

normal tyre — a tyre or run flat tyre intended for normal on-road use (6)

pneumatic-tyre structure — the technical characteristics of the tyre’s carcass (5)

run flat tyre — a tyre as defined in paragraph 2.4.3 of UNECE Regulation No 64 OJ L 310, 26.11.2010, p. 18. (7)

spare unit — a unit which is intended to be exchanged for a standard unit in case of malfunction of the latter and may be either of the following (13)

speed category symbol — the symbol as defined in paragraph 2.29 of UNECE Regulation No 30 for class class C1 tyres and paragraph 2.28 of UNECE Regulation No 54 for class C2 and C3 (16)

standard spare unit — an assembly of a wheel and tyre identical in terms of wheel and tyre size designation, wheel offset and tyre structure to that fitted in the same axle position and to the particular vehicle variant and version for normal operation, including wheels produced from a different material and which may use different wheel fixing nut or bolt designs, but which is otherwise identical to the wheel intended for normal operation (14)

standard unit — a unit which is capable of being fitted to the vehicle for normal operation (12)

temporary-use spare tyre — 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 (8)

temporary-use spare unit — an assembly of any wheel and tyre that does not fall within the definition of standard spare unit and which falls within one of the temporary-use spare unit type descriptions as defined in paragraph 2.10 of UNECE Regulation No 64 (15)

temporary-use spare wheel — a wheel different from one of the normal wheels on the vehicle type (10)

type of tyre — a range of tyres which do not differ in the following essential characteristics: the tyre class: C1, C2 or C3, as described in Article 8(1) of Regulation (EC) No 661/2009; and in the case of class C1, tyres, the characteristics of a type of pneumatic tyre as defined in paragraph 2.1 of UNECE Regulation No 30 OJ L 201, 30.7.2008, p. 70. ; in the case of class C2 or C3 tyres, the characteristics of a type of pneumatic tyre as defined in paragraph 2.1 of UNECE Regulation No 54 OJ L 183, 11.7.2008, p. 41. (2)

tyre size designation — the designation as defined in paragraph 2.17 of UNECE Regulation No 30 for class C1 tyres and paragraph 2.17 of UNECE Regulation No 54 for class C2 and C3 tyres (3)

unit — an assembly of a wheel and tyre (11)

vehicle type with regard to the installation of its tyres — vehicles which do not differ in such essential respects as the types of tyres, minimum and maximum tyre size designations, wheel dimensions and off-sets as well as speed and load capabilities suitable for fitment, and the characteristics of the wheel guards (1)

wheel — a complete wheel consisting of a rim and a wheel disc (9)

wheel off-set — the distance from the hub abutment face to the centre line of the rim (4)