Document ID: chunk:federal_register_of_legislation:F2018L01518:reg:60:p1
Version: federal_register_of_legislation:F2018L01518
Segment Type: reg
Provision Reference: reg 60 (pt 1/12)
Character Range: 21929–24693

60                110

2.37.6. For speeds in excess of 300 km/h, the maximum load rating must not exceed the mass specified by the tyre manufacturer with reference to the speed capacity of the tyre.  For intermediate speeds between 300 km/h and the maximum speed permitted by the tyre manufacturer, a linear interpolation of the maximum load rating applies.

2.38. "Flat tyre running mode" describes the state of the tyre, essentially maintaining its structural integrity, while operating at an inflation pressure between 0 and 70 kPa.

2.39. "Basic tyre functions" means the normal capability of an inflated tyre in supporting a given load up to a given speed and transmitting the driving, the steering and the braking forces to the ground on which it runs.

2.41. "Run flat system" or "Extended mobility system" describes an assembly of specified functionally dependant components, including a tyre, which together provide the specified performance granting the vehicle with the basic tyre functions, at least, at a speed of 80 km/h (50 mph) and a distance of 80 km when operating in flat tyre running mode.

2.42. "Deflected section height" is the difference between the deflected radius, measured from the centre of the rim to the surface of the drum, and one half the nominal rim diameter as defined in ISO 4000-1.

3. Markings

3.1.  Tyres submitted for approval shall bear on both side walls in the case of symmetrical tyres and at least on the outer side wall in the case of asymmetrical tyres:

3.1.1. The manufacturer's name or the Brand name/trademark;

3.1.2. The trade description/commercial name (see paragraph 2.4. of this Regulation). However, the trade description is not required when it coincides with the Brand name/trademark.

3.1.3. The trade name or mark;

3.1.4. The tyre-size designation;

3.1.5. An indication of the structure as follows:

3.1.5.1. on diagonal (bias-ply) tyres, no marking or the letter "D" placed in front of the rim diameter marking;

3.1.5.2. on radial-ply tyres, the letter "R" placed in front of the rim‑diameter marking, and, optionally, the word "RADIAL";

3.1.5.3. on bias-belted tyres, the letter "B" placed in front of the rim‑diameter marking, and in addition the words "BIAS-BELTED";

3.1.5.4. on radial ply tyres suitable  for  speeds  in  excess  of  240 km/h but not exceeding 300 km/h (tyres marked with the speed symbol "W" or "Y" as part of the service description), the letter "R", placed before the rim diameter code marking, may be replaced with the inscription "ZR".

3.1.5.5.  on "run flat" or "self supporting" tyres the letter "F" placed in front of the rim diameter marking.

3.1.6. The inscription M+S or M.S or M&S if the tyre is classified in the category of use "snow tyre" or if the tyre