Council directive 92/23/EEC of 31 March 1992 relating to tyres for motor vehicles and their trailers and to their fitting (repealed) (c. 23)

ANNEX II U.K. REQUIREMENTS FOR TYRES

Appendix 7 LOAD/SPEED TEST-PROCEDURE(1) (see Annex II, section 6.2)

PART A: PASSENGER CAR TYRES U.K.

1. Preparing the tyre U.K.

1.1. A new tyre is mounted on the test rim specified by the manufacturer pursuant to section 6.11 of Annex I, Appendix 1. U.K.

1.2. It is inflated to the appropriate pressure as given in the table below: U.K.

Test pressure (bar)
T-type temporary use spare tyres: to 4,2 bars.
Speed category	Diagonal (bias-ply) tyres			Radial tyres		Bias-belted tyres
	Ply-rating			Standard	Reinforced	Standard
	4	6	8
L, M, N	2,3	2,7	3,0	2,4	—	—
P, Q, R, S	2,6	3,0	3,3	2,6	3,0	2,6
T, U, H	2,8	3,2	3,5	2,8	3,2	2,8
V	3,0	3,4	3,7	3,0	—	—

1.3. The manufacturer may request, giving reasons, the use of an inflation pressure differing from those under section 1.2. In such a case the tyre is inflated to that pressure (see section 6.14 of Appendix 1 to Annex I). U.K.

1.4. The tyre-and-wheel assembly is conditioned at test-room temperature for not less than three hours. U.K.

1.5. The tyre pressure is readjusted to that specified in section 1.2 or 1.3. U.K.

2. Carrying out the test U.K.

2.1. The tyre-and-wheel assembly is mounted on a test axle and pressed against the outer face of a smooth wheel 1,70 m ± 1 % or 2 m ± 1 % in diameter. U.K.

2.2. Apply to the test axle a load equal to 80 % of: U.K.

2.2.1. the maximum load rating equated to the load capacity index for tyres with speed symbols L to H inclusive: U.K.

2.2.2. the maximum load rating associated with a maximum speed of 240 km/h for tyres with speed symbol ‘V’ (see section 2.31.2 of Annex II). U.K.

2.3. Throughout the test the tyre pressure must not be corrected and the test load must be kept constant. U.K.

2.4. During the test the temperature in the test-room must be maintained at between 20 ^oC and 30 ^oC or at a higher temperature if the manufacturer agrees. U.K.

2.5. The test is carred out without interruption in conformity with the following particulars: U.K.

2.5.1. time taken to pass from zero speed to initial test speed: 10 minutes; U.K.

2.5.2. initial test speed: prescribed maximum speed for the type of tyre, less 40 km/h in the case of the smooth wheel having 1,70 m ± 1 % in diameter or less 30 km/h in the case of the smooth wheel having 2 m ± 1 % in diameter; U.K.

2.5.3. successive speed increments: 10 km/h; U.K.

2.5.4. duration of test at each speed step except the last: 10 minutes; U.K.

2.5.5. duration of test at last speed step: 20 minutes; U.K.

2.5.6. maximum test speed: prescribed maximum speed for the type of tyre, less 10 km/h in the case of the smooth wheel having 1,7 m ± 1 % in diameter or equal to prescribed maximum speed in the case of the smooth wheel having 2 m ± 1 % in diameter. U.K.

3. Equivalent test methods U.K.

If a method other than that described in section 2 is used, its equivalence must be demonstrated.

(1)

In the case of passenger car tyres intended for vehicles designed for a maximum speed greater than 240 km/h (Z rated tyres), until uniform test procedures have been agreed the manufacturer of the tyre must satisfy the technical service that his test procedure and results are acceptable.