Vehicle Wheels and Tyres Construction and Maintenance — Open Awards Occupational Qualification Motor Vehicle & Transport Revision
This element covers the safe working practices, fundamental construction, and key terminology associated with road wheels and tyres, alongside the practica
Topic Synopsis
This element covers the safe working practices, fundamental construction, and key terminology associated with road wheels and tyres, alongside the practical skills required for routine inspection, maintenance, and replacement. Learners will explore how wheel and tyre assemblies are designed to support vehicle loads, provide traction, and absorb road shocks, while developing competence in tasks such as pressure checks, tread depth assessment, and wheel removal and refitting in line with industry standards.
Key Concepts & Core Principles
- Vehicle systems: Understand the main systems of a car, including the engine, transmission, braking, steering, suspension, and electrical systems, and their basic functions.
- Health and safety: Know how to work safely in a garage environment, including using personal protective equipment (PPE), handling hazardous materials, and following risk assessments.
- Tools and equipment: Identify common hand tools (e.g., spanners, sockets, screwdrivers) and workshop equipment (e.g., jacks, axle stands, multimeters) and their correct uses.
- Routine maintenance: Perform basic maintenance tasks such as checking fluid levels, replacing wiper blades, inspecting tyres, and changing bulbs, following manufacturer guidelines.
- Basic engine principles: Explain the four-stroke cycle (intake, compression, power, exhaust) and the role of key components like pistons, valves, and spark plugs.
Exam Tips & Revision Strategies
- In practical assessments, always verbalise your safety checks, such as ensuring the vehicle is on level ground, chocking wheels, and verifying jack stability before proceeding—this demonstrates comprehensive awareness to the assessor.
- When answering written questions on tyre construction, draw and label a cross-section diagram to support your explanation; this often earns higher marks by showing understanding of layer structures like belts and plies.
- Memorise the meaning of common tyre sidewall codes (e.g., P-metric vs LT, load index charts) and be prepared to decode them quickly in a test scenario—examiners frequently include these as spot questions.
- If tasked with a wheel change, follow the exact sequence: loosen nuts slightly before lifting, remove fully after lifting, then refit by hand before snugging down in a cross-pattern, and finally torque with wheel on the ground—adhering to this order prevents errors and shows methodical competence.
- In any maintenance report or write-up, explicitly mention any corrective actions taken, such as adjusting pressure or advising replacement of a damaged tyre, to demonstrate proactive, safety-focused decision-making.
- Always refer to the vehicle manufacturer’s specifications when checking tyre pressures, as these can vary between front and rear axles.
- When demonstrating wheel removal, ensure the vehicle is securely supported on axle stands before fully detaching the wheel.
- In written assessments, memorise the standard layout of tyre sidewall markings to correctly answer questions on tyre specifications.
Common Misconceptions & Mistakes to Avoid
- Confusing the tyre section width (mm) with the rim diameter (inches) when reading tyre size markings, or misunderstanding the aspect ratio as a direct measurement rather than a percentage.
- Neglecting to check and adjust tyre pressures when the tyres are cold, leading to inaccurate readings due to heat-induced pressure increase after driving.
- Failing to use a calibrated torque wrench when refitting wheels, either overtightening wheel nuts which can warp brake discs, or under-tightening risking wheel detachment.
- Overlooking the importance of inspecting tyres for age degradation (cracking/crazing) alongside tread depth, assuming legal minimum tread (1.6mm) guarantees safe performance.
- Assuming all wheel nuts have the same torque specification, rather than consulting the vehicle manufacturer’s data, especially on vehicles with alloy wheels or different fastener types.
- Confusing the directional rotation arrow with the tread wear indicator, leading to incorrect tyre fitting.
Examiner Marking Points
- Award credit for demonstrating correct selection and use of personal protective equipment (PPE) and following safe lifting procedures when working with vehicle jacks and stands.
- Award credit for accurately identifying and explaining the function of wheel and tyre components, such as rim, bead, sidewall, tread, and valve stem, during oral or written assessment.
- Award credit for correctly interpreting tyre sidewall markings, including size, load index, speed rating, and DOT code, and linking these to vehicle specifications.
- Award credit for competently performing routine maintenance tasks, such as inflating tyres to the recommended pressure, measuring tread depth with a calibrated gauge, and inspecting for uneven wear, cuts, or bulges.
- Award credit for safely removing and refitting a road wheel, including loosening and tightening wheel nuts in the correct sequence, applying the manufacturer-recommended torque, and checking security after refitting.
- Award credit for correctly demonstrating the use of personal protective equipment (PPE) and safe lifting techniques when handling wheels and tyres.
- Credit should be given for accurately identifying and describing the function of tyre components such as the carcass, breaker belt, and inner liner.
- Marks should be awarded for correctly using key terms like aspect ratio, load index, and speed rating when interpreting tyre sidewall markings.