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The size question is where customers leave

Every step in a booking flow loses some people. The tyre size field loses a disproportionate share, because it is the only step that asks the customer for information they have to go outside and find.

What happens next is worse than a simple drop-off. Some abandon, some guess, and a proportion of the guesses are wrong, which turns into a wrong order, a wasted bay slot and a refund conversation.

A vehicle registration lookup replaces that field with something every driver has memorised or can read off the paperwork in front of them.

What lookup actually returns

A registration resolves to a specific vehicle, and from the vehicle you can derive far more than a size.

• The original equipment fitment, including staggered setups where front and rear differ.
• Load index and speed rating the manufacturer specifies, which are requirements rather than preferences.
• Alternative approved sizes, so you can offer a choice without offering something that does not fit.
• Fuel type and body style, which lets you show the right services alongside the tyres.
• Enough detail to pre-fill a service booking, so the customer types almost nothing.

The commercial point is that you stop selling a size and start selling a fitment. The customer sees options that suit their actual car, which is both more useful to them and much harder to get wrong.

Fewer wrong orders is the quiet saving

Conversion is the headline benefit and the error rate is the one that shows up in your margin.

A wrong size ordered against a guessed fitment costs you the return, the restocking, the bay slot held for a job that cannot go ahead, and a customer who is now less confident in you than before they arrived.

Matching to the real vehicle removes most of that category. It also means the fitting notes are right: a car needing a particular load rating or a specific torque figure is known before the van is loaded rather than discovered on the driveway.

Where it fits in the flow

Put the lookup first and everything downstream gets easier.

The pattern that works is registration, then confirm the vehicle back to the customer in plain language, then show what fits with a fitted price. The confirmation step matters more than it looks: a customer who sees their own car described correctly trusts the prices underneath it.

Keep a manual size entry available for the minority who want it, for trade customers and for vehicles the data does not cover. It should be the alternative rather than the default.

What to do when the lookup does not find a car

No data source is complete, and how you handle a miss decides whether it costs you the booking.

1. Fail gracefully to manual size entry in the same step, rather than a dead end or an error.
2. Offer a photograph of the sidewall as an option, since a customer standing at the car can send one in seconds.
3. Capture the registration anyway, so someone can follow up rather than losing the enquiry entirely.
4. Log the misses. A pattern of failures on one make or one age of vehicle is a data problem worth raising rather than absorbing.

The failure path is where most implementations are weak, and it is the part a customer remembers.

Coverage across markets

A shop in one country needs one registration format. A network operating across several needs many, and they behave differently.

Plate formats, the data available behind them and what each market legally exposes all vary, so a lookup that works well in one place can return very little in another. If you operate across borders, or intend to, that is worth checking before it becomes a support problem.

The same applies to the storefront language around it. Asking for a number plate, a registration or a licence plate is the same question in different markets, and using the local term is a small change that measurably reduces hesitation.