BS ISO 4251-1:2019 pdf free
BS ISO 4251-1:2019 pdf free.Code designated diagonal tyres (ply rating marked series) for agricultural tractors, trailers and machines
tyre designed to be fitted to non-driven axles of agricultural tractors (motor vehicles in category T)
Note 1 to entry: The tread pattern of the tyre generally consists of circumferential grooves and ribs.implement tyre
tyre designed primarily for agricultural machines, interchangeable towed equipment (vehicles in category S) or agricultural trailers (vehicles in category R)
Note 1 to entry: Such tyre may also equip either front steering wheels and drive wheels of agricultural tractors (vehicles in category T), but it is not suitable for sustained high torque service.
Tubeless tyres shall be marked with the word “TUBELESS”.
Except when specifically required in point 4.3 above, the classification code marking, as described in ISO 18805, may additionally be marked, but it is not part of the size designation of the tyre.
In the case of a preferred direction of rotation of the tyre, an arrow shall be used to indicate that direction.
Maximum pressure for tyre bead seating shall be marked with the following inscription:”XXX kPa MAX” or “XXX bar MAX” inside the pictogram (Figure 1) indicating the maximum inflation pressure that shall not be exceeded for bead seating during tyre mounting. The value of the tyre bead seating pressure is determined by the tyre manufacturer.
The marking of the pictogram on the tyre sidewall is optional, but can be required for conformity to some regional regulations.
An example of the pictogram to be marked on both sidewalls of the tyre is given in Figure 1.
Rolling circumference (RC), rolling circumference index (RCI) and speed radius index (SRI) are parameters which are used exclusively for the calculation of forward ground speed during homologation procedures (see for further information ISO 3965 and ISO 11795).Values for tractor drive wheel tyres are given in Annex D.BS ISO 4251-1 pdf free download.
