This Section of BS AU 50 gives recommendations on the steps to be taken in selecting replacement tyres and wheels for commercial vehicles and on the care of tyres, wheels and wheel fixings. It describes the principal types of wheels and fixings and the procedures to be carried out when fitting wheels.

The types of fixings and sizes described in this British Standard are normally used on heavy commercial vehicles, but if used on other types of vehicle then the recommendations given in this standard also apply.