EUWA ES-3.04 Definition of Static Unbalance of Steel and Light Metal Wheels for_ Cars, Estate Cars, Vans and Car Trailers
This specification covers the static unbalance of steel and aluminium wheels for passenger cars, estate cars, light trucks and car trailers. Wheel unbalance is not a process capable feature due to several reasons from raw material, tooling and process. Possible reasons could be thickness variations of the disc or rim material for steel wheels, eccentricity of PCD to centre bore, radial run out or machining/heat treatment differences for cast wheels. A statement on capability can only be made by a large random test.