BS ISO 8664:2018

1   Scope 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](/search?q=ISO%C2%A04251%E2%80%911) and [ISO 4251‑2](/search?q=ISO%C2%A04251%E2%80%912); 
     
     
       
         —  tyres for logging and forestry machines are specified in [ISO 18807](/search?q=ISO%C2%A018807) 1 ; 
     
     
       
         —  tyres for construction/industrial tractors are specified in [ISO 13442](/search?q=ISO%C2%A013442).