For fitments on a STEER axle we must:
Use “S” treads patterns only. These tread patterns are designed and manufactured to cope with the specific stresses and strains imposed on the steering axles of the truck: dynamic load, axle geometry, high mileage, etc.
We do not recommend mounting retreaded tyres on the front axle of motor vehicles.
When fitting tyres on a DRIVE axle we must: Use tyres with “D” or “S” tread patterns exclusively. “D” tread patterns are designed to cope with the specific stresses of the drive axles: engine torque and brake torque, twin fitment, the highest axle load of the whole truck combination. Tyres with a “S” tread pattern can be fitted on drive axles, but the compromise likely in mileage performance needs to be considered carefully. “D” treads patterns offer optimized performances in the areas of traction and tyre longevity when compared to the “S” tread patterns.
To equip a TRAILER axle we must:
Use tyres with “T” or “S” tread patterns exclusively. These tread patterns are designed to cope with the specific stresses and strains of trailer axles: static and dynamic loads, scrubbing, high mileage on the Centre axles, etc. Tyres with “T” tread patterns bear load indices and speed ratings suited to trailers or semi-trailers. When fitting tyres with “S” tread patterns, check that the load and speed index comply with the needs of the axle and that there is no “T” tread pattern which would better suit the specific stresses and strains of trailer axles. Tyres with “T” tread must never be used on front steer or drive axles.
Tyres marked FRT:
The FRT (Free Rolling Tyre) marking is stipulated in Regulation 54: Marking 3.1.15. The presence of the "FRT" marking denotes tyres specifically designed for trailer axles (tyres for towed axles). This regulation applies to all new tyres used within Europe, which means that FRT-marked tyres are only authorised to be mounted on trailer axles and cannot be installed on other types of axles.
We cannot be held liable for the consequences of any damage incurred while driving if its instructions are disregarded.
A “FRT” branded tyres can be mounted on the last non-drive rear axle of a motor vehicle.