21679 version 2

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Demonstrate knowledge of interchanging and balancing road wheels in the motor industry

Level / 2
Credits / 2

PurposeThis theory-based unit standard is for people who wish to enter or are employed in the automotive repair industry. People credited with this unit standard are able to demonstrate knowledge of interchanging vehicle and/or machine wheels, and balancing wheels and tyres.

Subfield / Motor Industry
Domain / Automotive Preventive Maintenance
Status / Registered
Status date / 27 July 2005
Date version published / 26 November 2007
Planned review date / 31 December 2012
Entry information / Open.
Accreditation / Evaluation of documentation by NZQA and industry.
Standard setting body (SSB) / NZ Motor Industry Training Organisation (Incorporated)
Accreditation and Moderation Action Plan (AMAP) reference / 0014

This AMAP can be accessed at

Special notes

Enactments relevant to this unit standard include but are not limited to – Health and Safety in Employment Act 1992; Land Transport Rule, Tyres and Wheels 2001, Rule 32013.

Elements and performance criteria

Element 1

Demonstrate knowledge of interchanging vehicle and/or machine wheels.

Performance criteria

1.1Safe working practices when interchanging wheels are described according to vehicle manufacturer’s specifications and legislative requirements.

Rangepersonal safety, safety of others, no damage to equipment, vehicle safety.

1.2Procedures for lifting the vehicle and/or machine to remove and replace wheels are described according to the vehicle and/or machine manufacturer’s specifications.

Rangeincludes but is not limited to – jacking points, use of supports (axle stands), vehicle supported so that wheels are clear of the ground and the vehicle cannot slip; jack, hoist.

1.3Considerations to take into account when interchanging wheels and tyres are explained according to the vehicle and/or machine manufacturer’s specifications and legislative requirements.

Rangeincludes but is not limited to – matching type and size of wheels and tyres, matching tyres by amount of wear, tread pattern, tyre construction.

1.4Procedures to check wheel bearings are described according to the vehicle and/or machine manufacturer’s specifications and/or legislative requirements.

Rangeplay, over-tight, roughness.

1.5Procedures for removing and refitting wheels are described according to the vehicle and/or machine manufacturer’s specifications.

Rangeincludes but is not limited to – positioning, avoiding damage to the vehicle, wheel and hub condition, threads of the wheel nuts and studs, torquing wheel nuts and studs, removing supports, lowering vehicle.

Element 2

Demonstrate knowledge of balancing wheels and tyres.

Performance criteria

2.1Reasons for balancing wheels and tyres are explained according to the tyre, vehicle and/or machine manufacturer’s specifications.

Rangeincludes but is not limited to – tyre wear, damage to components, driving safety.

2.2Types of wheel balancers are described according to the equipment manufacturer’s specifications.

Rangeon-vehicle balancing, off-vehicle balancing.

2.3Types of weights and attachment methods used in wheel balancing are described according to the equipment manufacturer’s specifications.

2.4Procedures for balancing vehicle wheels are explained according to the equipment manufacturer’s specifications.

Rangeincludes but is not limited to – cars, light and heavy commercial vehicles.

2.5Safety procedures when balancing wheels are described according to the equipment manufacturer’s specifications.

Rangepersonal safety, safety of others, no damage to equipment, vehicle safety.

Please note

Providers must be accredited by NZQA, or an inter-institutional body with delegated authority for quality assurance, before they can report credits from assessment against unit standards or deliver courses of study leading to that assessment.

Industry Training Organisations must be accredited by NZQA before they can register credits from assessment against unit standards.

Accredited providers and Industry Training Organisations assessing against unit standards must engage with the moderation system that applies to those standards.

Accreditation requirements and an outline of the moderation system that applies to this standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The AMAP also includes useful information about special requirements for organisations wishing to develop education and training programmes, such as minimum qualifications for tutors and assessors, and special resource requirements.

Comments on this unit standard

Please contact theNZ Motor Industry Training Organisation (Incorporated) you wish to suggest changes to the content of this unit standard.

 New Zealand Qualifications Authority 2018