The National Heavy Vehicle Regulator is currently consulting with the automotive industry and is working on a new modification code (D3) for the fitment of non-standard rear wheel components on heavy vehicles. Upon completion, the D3 modification code will be included in the Vehicle Standards Bulletin 6 (VSB6) and allow certification of modifications by qualified Approved Vehicle Examiners (AEVs).
This is a complex issue due to the possibility of overloading components such as wheel bearings, axles and brakes, requiring complex assessments to ensure that parts remain within their safe working limits.
You can access the D3 draft modification code by clicking here.
You can access the D3 draft checklist by clicking here.
You can also get more information from the NHVR by clicking here.You can provide feedback to the NHVR by completing their feedback document, which you can access by clicking here and emailing it to VSB6SIWG@nhvr.gov.au
by COB Friday 24 August.