Technical Standards EUWA ES-3.16 Standardisation of Fixing Holes – Truck Wheels.

This EUWA Standard specifies the dimensional characteristics necessary for
the attachment of the wheel on the hub. The flat attachment type with centring
on central bore ( hub centring ) is the recommended type for future equipment.
The specifications indicated hereafter do not imply that the wheel is interchangeable
from one vehicle to another.
The fatigue life performance of the wheel can depend on the vehicle’s hub shape.
The hub should provide a full circular support of the wheel attachment face in
order to have no negative influence on the fatigue life behaviour.
For non circular or non flat hubs a negative effect to the wheel’s endurance
behaviour is given.

EUWA ES-3.16 Standardisation of Fixing Holes - Truck Wheels.