BS ISO 4251-2:2019 pdf free.Code designated diagonal tyres (ply rating marked series) for agricultural tractors, trai lers and machines.
5.1.3 Tractor drive wheel tyres on combine harvesters On combine harvesters in cyclic loading application, except hillside combines, a load of up to 170 % of the basic tyre loads given in Table A.1 is permitted for speeds up to 10 km/h with an inflation pressure increase of approximately 30 % (consult tyre manufacturers). This load increase shall include all possible field and user modifications that increase vehicle mass. The vehicle shall be unloaded before off-field transport. The wheel and rim manufacturers shall be consulted concerning the strength of the wheels. For tyre load and inflation pressure recommendations for combine harvesters in transport service, the tyre manufacturer shall be consulted. . 5.2 Agricultural tractor steering wheel tyres 5.2.1 General Basic tyre loads and their corresponding reference inflation pressures shall be as given in Table A.3. In the absence of the marking of the service description (load index and speed symbol), the basic tyre loads (BTL) for reference speed 30 km/h and the relevant load/speed relationship of Table A.4 column A6 apply. Tyre loads at different speeds (load speed relationship) shall be as given in Table A.4,5.2.2  Tyres marked with additional service description Table 2 shows, as an example, the tyre load carrying capacities at various service speeds for tyre size 6.00-16 6 PR at 340 kPa in the case where it is marked with a supplementary service description, compared to the case where no service description is marked on the tyre.5.2.3 Tractor steering wheel tyres on combine harvesters On combine harvesters in cyclic loading application, except hillside combines, a load of up to 150 % of the basic tyre loads given in Table A.3 is permitted for speeds up to 10 km/h. This load increase shall include all possible field and user modifications that increase vehicle mass. The vehicle shall be unloaded before off-field transport. The wheel and rim manufacturers shall be consulted concerning the strength of the wheel.BS ISO 4251-2 pdf download.