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This part of ISO 7867 establishes the service description, the tyre load ratings in basic and special applications, and reference inflation pressure increments for the metric series of tyres primarily intended for agricultural tractors and machines. It applies to bias-belted, diagonal and radial tyres mounted on 5° tapered rims, as specified in ISO 4251-3. It also applies to different concepts and types of tyres and rims; in these cases, however, appropriate load/speed curves and reference inflation pressure increments will be established and added. Basic tyre load-carrying capacities for ranges of existing tyres are given in Annex A. NOTE Designation and marking of the metric series are defined in ISO 7867-1. Tyres (ply rating marked series) and rims for agricultural tractors and machines are specified in ISO 4251-1 to ISO 4251-5. Service description (load index and speed symbol) marking of existing series of agricultural tractor-drive-wheel tyres is given in ISO 8664.