This document specifies the marking, dimensions, load ratings and reference speeds for code-designated agricultural tractor drive-wheel tyres with service description (load index and speed symbol). It applies to tyres of radial construction in the speed categories 40 km/h (speed symbol A8), and 50 km/h (speed symbol B). NOTE Code designated series of: — diagonal (ply rating marked) tyres for agricultural tractors and machines are specified in ISO 4251‑1 and ISO 4251‑2; — tyres for logging and forestry machines are specified in ISO 18807[1]; — tyres for construction/industrial tractors are specified in ISO 13442. [1] To be published.