What does OEM actually mean on a tyre?

An OEM (original equipment manufacturer) tyre is one the tyre maker developed jointly with the car maker for a specific model, then validated together for handling, noise, comfort and efficiency. You can spot it by a small code on the sidewall. Common markings include:

• ★ (star) — BMW / Mini
• MO, MOE — Mercedes-Benz (MOE = run-flat)
• N0–N7 — Porsche
• AO, RO1, RO2 — Audi
• K1, K2, K3 — Ferrari
• T0, T1, T2 — Tesla
• VOL — Volvo

Learn to find these alongside the size and load information in our tyre sidewall guide. An “aftermarket” tyre is simply any replacement without that model-specific marking — which includes the vast majority of good tyres on the market.

Do you legally have to match the OEM marking in Australia?

No. The marking is not a legal requirement. Australian rules care about size, load index and speed rating — the figures on your tyre placard. Any tyre that meets those, and is fitted correctly, is road-legal. Tyre makers such as Michelin recommend replacing an OE-marked tyre with the same marking where available, because it preserves the performance the car was engineered around — but that is advice, not law.

When is it worth sticking with factory-spec tyres?

The OE marking earns its place in a few clear cases:

• EVs: factory tyres are often tuned for rolling resistance (range), extra load (battery weight) and noise, sometimes with acoustic foam. See EV-specific tyres and foam-filled acoustic tyres.
• Prestige and performance cars: handling, steering feel and stability control are calibrated to the OE tyre. Matching the mark keeps that intact.
• Run-flat cars: if the car has no spare, you generally must stay with a run-flat unless you add a repair kit or spare. See are run-flats worth it.
• Heavy loads: always match or exceed the placard load index — understand it via XL vs standard load.

When is a good aftermarket tyre the smarter buy?

For most mainstream cars — hatchbacks, sedans, family SUVs — a quality aftermarket tyre in the correct size, load and speed rating can equal or beat the original. Factory tyres are frequently chosen to hit a showroom target such as low cost, low noise or maximum economy, and they are not always the longest-lasting or best-value option. A well-chosen aftermarket tyre lets you prioritise what you value: tread life, wet grip, quiet or price. Decide on cost per kilometre, and use our best-value brand and tyre tier guides to choose.

How to decide

Start with the placard size, load and speed rating — those are non-negotiable. Then ask whether your car is one of the special cases above. If it is an EV, a prestige/performance car or a run-flat vehicle, match the OE marking. If it is a mainstream car, shop the aftermarket on cost per kilometre and the qualities you care about. For the premium-versus-value trade-off in general, see premium vs budget tyres, and note that even premium makers like Michelin sell both OE-marked and standard versions of the same tyre.

Bottom line: Matching the OE marking is optional, not legal. Keep it for EVs, prestige, performance and run-flat cars; on ordinary cars, a quality aftermarket tyre in the right size, load and speed is usually the better value.

Frequently asked questions

Is it illegal to fit non-OEM tyres in Australia?

No. As long as the tyre meets the size, load index and speed rating on your placard and is fitted correctly, it is legal. The OE marking is a manufacturer recommendation, not a legal requirement.

What does the star or MO marking on my tyre mean?

It identifies a tyre co-developed for a specific car maker — the star is BMW/Mini, MO is Mercedes-Benz, N-codes are Porsche, AO/RO are Audi. See our sidewall guide.

Do EVs need OEM tyres?

Not strictly, but factory EV tyres are tuned for range, load and noise, so matching them (or a proper EV-rated alternative) is wise. Read EV-specific tyres.

Are OEM tyres better quality than aftermarket?

Not necessarily. They are tuned to the car, but are often chosen for a showroom target rather than maximum life or value. A quality aftermarket tyre can be equal or better for a mainstream car.

Can I switch from run-flats to normal tyres?

Only if you add a spare or repair kit, since run-flat cars often have none. See are run-flats worth it in Australia.

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External references: Michelin — marked (OE) tyres explained; Goodyear — OE marking guide.