Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:10:p7
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 10 (pt 7/32)
Character Range: 1288296–1291297

shall be set to the RRC value of the applicable tyre energy efficiency class according to Table A4/2 of Annex B4.
              In the case where individual vehicles can be supplied with a complete set of standard wheels and tyres and in addition a complete set of snow tyres (marked with 3 Peaked Mountain and Snowflake – 3PMS) with or without wheels, the additional wheels/tyres shall not be considered as optional equipment.
              If the tyres on the front and rear axles belong to different energy efficiency classes, the weighted mean shall be used and calculated using the equation in paragraph 3.2.3.2.2.2.3. of this annex.
              If the same tyres, or tyres with the same rolling resistance coefficient were fitted to test vehicles L and H, the value of  for the interpolation method shall be set to .
              3.2.3.2.2.2.3. Calculating the weighted mean of the rolling resistances
where:
                          represents vehicle L, H or an individual vehicle.
                          and RRH,FA are the actual RRCs of the front axle tyres on vehicles L and H respectively, kg/tonne;
                          is the RRC value of the applicable tyre energy efficiency class according to Table A4/2 of Annex B4 of the front axle tyres on the individual vehicle, kg/tonne;
                         RRL,RA, and RRH,RA are the actual RRCs of the rear axle tyres on vehicles L and H respectively, kg/tonne;
                         RRind,RA is the RRC value of the applicable tyre energy efficiency class according to Table A4/2 of Annex B4 of the rear axle tyres on the individual vehicle, kg/tonne;
                          is the proportion of the vehicle mass in running order on the front axle;
              RRx shall not be rounded or categorised to tyre energy efficiency classes.
              3.2.3.2.2.3. Aerodynamic drag of an individual vehicle
              3.2.3.2.2.3.1. Determination of aerodynamic influence of optional equipment
              The aerodynamic drag shall be measured for each of the aerodynamic drag-influencing items of optional equipment and body shapes in a wind tunnel fulfilling the requirements of paragraph 3.2. of Annex B4 verified by the responsible authority.
              For the purpose of the interpolation method, the aerodynamic drag of optional equipment within one road load family shall be measured at the same wind speed, either vlow or vhigh, preferably vhigh, as defined in paragraph 6.4.3. of Annex B4. In the case that vlow or vhigh does not exist, (e.g. the road load of VL and/or VH are measured using the coastdown method), the aerodynamic force shall be measured at the same wind speed within the range ≥ 80 km/h and ≤ 150 km/h. For Class 1 vehicles, it shall be measured at the same wind speed of ≤ 150 km/h.
              3.2.3.2.2.3.2. Alternative method for determination of aerodynamic influence of optional equipment
              At the request of the manufacturer and with approval of the responsible