This part of ISO 4251 specifies rim dimensions for the ply rating marked series of tyres for agricultural tractors and machines. NOTE Tyre designation and dimensions, load ratings and tyre classification and nomenclature are given in ISO 4251-1, ISO 4251-2, ISO 7867-2, ISO 4251-4, ISO 7867-1 and ISO 8664. All dimensions in this part of ISO 4251 are given in millimetres and are applicable to the side of the rim which is in contact with the tyre. NOTE Terms used are in accordance with ISO 3911:2004