This part of ISO 4250 sets out the designation, contours and dimensions for rims for narrow- and wide-base off-road tyres primarily intended for earth-moving machinery. All dimensions in this part of ISO 4250 are given in millimetres and are applicable to the side of the rim which is in contact with the tyre. Tyre designations and dimensions, tyre classifications and nomenclature are given in ISO 4250-1, ISO 10571 and ISO 13442. Annex A gives details on sealing ring grooves and O-rings for earth-mover rims.