Division 2.5.1 Determination of mr

m_r is the equivalent effective mass of all the wheels and vehicle components rotating with the wheels on the road while the gearbox is placed in neutral, in kilograms (kg). m_r shall be measured or calculated using an appropriate technique agreed upon by the approval authority. Alternatively, m_r may be estimated to be 3 per cent of the sum of the mass in running order and 25 kg.