A photographed tyre and its sidewall. Illustrative tyre-specification context; use the placard on the actual vehicle. Previews may crop the photograph.
Photo: 请叫我斌少 · CC BY-SA 3.0
The tyre placard is the starting point for replacement tyres. Photograph it on the actual car before asking for quotes, especially if a previous owner has changed the wheels.
Transport for NSW's wheel-and-tyre guidance explains that the placard sets out manufacturer-recommended combinations, load capacity, speed rating and inflation pressures. Its modification rules apply in NSW; confirm the requirements of the state or territory where your vehicle is registered.
Read the code without making it an approval
A hypothetical marking of 225/55 R18 98V contains different instructions: nominal section width, aspect ratio, radial construction, rim diameter, load index and speed symbol. It is an example to recognise the fields, not a tyre recommendation.
Copy the complete required marking from your placard and manual. Ask the supplier to explain the load and speed symbols using the appropriate reference and confirm the proposed tyre is suitable for your exact vehicle.
Do not compare rim diameter alone. A tyre that fits the wheel physically has not thereby passed the vehicle's load, speed, dimension or approval checks.
Reconcile the placard with the written quote
Size: does the quote show the complete proposed size, including any different front and rear fitment?
Load and speed: are both recorded, with any departure from the placard explained against manufacturer guidance and local rules? Ask a licensed certifier where the proposed modification requires it.
Pressure: what cold pressures does the vehicle require for your normal and loaded use? Keep the placard's instruction separate from the maximum figure moulded onto a tyre.
Other requirements: confirm any vehicle-specific construction, repair restrictions or monitoring-system requirements with the supplier and manufacturer.
Treat an altered wheel package as another decision
If the proposed size differs from the placard, ask what evidence permits it. Transport for NSW warns that wheel and tyre changes can affect road behaviour and that significant modifications can need certification.
Our 4WD fuel-use article discusses running-cost choices. A fuel-saving claim does not establish that a tyre is an approved fitment or suitable for the load you carry.
Keep the itemised quote with the car's ownership budget. For information about financing a replacement car, visit Loanseekers with that vehicle purchase budget.
