A registration search is a convenient way to narrow down the tyres for a car. Enter the number plate, check that the returned vehicle details are right, then compare the suggested sizes with the vehicle and its approved fitment information before paying.
The search is a starting point. It cannot inspect the car, establish which wheels are now fitted or guarantee that a previous owner selected the correct tyres.
How a registration search works
The retailer's lookup matches a registration to vehicle information and uses a fitment database to suggest relevant sizes or products. The exact data and matching process depend on the provider. Some searches return several options because a model was sold with different wheel packages.
This is useful for finding the likely vehicle family without manually navigating every make and model. It is not proof that the first tyre displayed fits the particular wheels on your driveway.
Why the suggested size can differ
Factory wheel options, trim differences, imports, database errors and later modifications can all affect the result. Some vehicles have different sizes on the front and rear. A search that shows one size without explaining the axle may therefore give an incomplete picture.
The tyres currently fitted are useful evidence, but they can also be wrong. If their markings conflict with the handbook, placard or approved fitment information, ask a competent fitter to resolve the discrepancy rather than automatically copying them.
The checks to make before ordering
- Confirm the registration search identifies the correct vehicle.
- Read the full markings on both front and rear tyres, including size, load index and speed rating.
- Compare the information with the vehicle maker's requirements for the fitted wheel option.
- Check construction, any required run-flat specification and relevant original-equipment markings.
- Make sure the product you select matches the agreed specification, not merely the wheel diameter.
Do not choose a lower load or speed rating simply because the search tool allows it. If an alternative fitment is proposed, establish that it is suitable for the specific vehicle and use.
What if the car has aftermarket wheels?
A registration lookup normally cannot establish what a wheel conversion requires. The tyre dimensions, wheel width, clearance, load capacity and vehicle systems all need consideration. Copying the existing sidewall is not sufficient evidence that the conversion was done correctly.
Use the wheel supplier's approved application information and seek competent advice. Do not treat a nearby size as interchangeable because the numbers look similar or the replacement is cheaper.
What to send the seller if you are unsure
Provide the registration, model and year, together with clear photographs of the complete sidewall markings on each axle. Mention any wheel modifications and whether the front and rear sizes differ. If available, include the relevant handbook or placard information.
Ask the seller to confirm the exact specification in writing. Keep that confirmation with the order. When the tyres arrive, check the labels and sidewalls before fitting; an agreed specification is more useful than an assumption that the number plate guaranteed the match.
Our advice
Use registration search to make finding tyres easier, then verify the result. It saves navigation time but does not replace checking the car. If the information disagrees, resolve the fitment before ordering rather than taking whichever answer appears most convenient.
Further reading
Common questions
Does a number-plate search always find the right tyre size?+
No. It suggests options using vehicle and fitment data. Confirm the exact size and specification against the car and approved vehicle information before ordering.
What if my front and rear tyres are different sizes?+
Check each axle separately and use the vehicle maker's approved front and rear specifications. Do not assume a single search result applies to all four wheels.
Should I copy the size already on the car?+
It is useful evidence, but not a guarantee. Previous tyres or wheel modifications may be incorrect. Resolve any conflict with approved vehicle information before buying.