Industry Guides· 3 min read· By The SpideyChat Team

Tyre Size and Fitment Questions Drivers Get Wrong

A driver reads a number off a sidewall and orders the wrong thing. Myths about tyre sizing and what a shop should publish.


A driver reads the numbers off his front tyre, orders four online, and books a fitting. Two of them are the wrong size because somebody fitted the wrong thing to the front two years ago.

He copied what was there. What was there was already wrong.

Myth 1: the sidewall tells you what fits

Reality: it tells you what is currently fitted, which is not the same thing. Checking against the manufacturer's recommendation is the only reliable method and almost nobody does it.

Myth 2: the numbers are the whole specification

Reality: load and speed ratings matter as much as the dimensions, and fitting something rated below the requirement is a real problem rather than a technicality.

Myth 3: front and rear are always the same

Reality: some vehicles specify different sizes, and drivers who assume uniformity order incorrectly. It should be checked rather than assumed.

Myth 4: any tyre of the right size is equivalent

Reality: construction, tread pattern and intended use differ enormously. Two tyres of identical size behave very differently in the wet.

Myth 5: mixing brands does not matter

Reality: mixing across an axle affects behaviour, and guidance exists about what should be avoided. Explaining it plainly is more useful than a recommendation to buy four.

Myth 6: the spare is the same

Reality: it frequently is not, and drivers discover it at the roadside. Worth mentioning when somebody is buying.

Myth 7: buying online is simply cheaper

Reality: once fitting, balancing, valves and disposal are added the difference is smaller than it appears, and a wrong order costs a day. Publishing your total price makes the comparison honest.

Myth 8: a shop cannot check beforehand

Reality: a registration is usually enough to establish what a vehicle takes. Offering to check before anybody orders is the service that wins the customer, which is the availability question in tyre size and stock questions that decide where drivers go.

Explain what a wrong order actually costs

A driver who orders online and books a fitting loses a morning when the tyres turn out to be wrong, and frequently cannot return them. Saying so plainly, with the offer to check first, is what converts somebody who was about to gamble on a number they copied off a sidewall.

Publish how to find the recommendation

Where it is on the vehicle and what to look for. It takes a driver two minutes and prevents most wrong orders.

Publish your all in price

Tyre, fitting, balancing, valve and disposal, as one figure per size. Drivers compare headline prices and are caught by the additions.

Offer to check the registration

Before any order, at any hour. It is thirty seconds of work and it converts a browsing driver into a booking.

Explain when a tyre cannot be fitted

Damage, age, mismatched pairs or something unsafe elsewhere. Drivers should know you may decline and why.

Publish the safety questions honestly

Tread, age, damage and what actually needs replacing, which is the ground in puncture repair and tyre safety questions answered honestly.

Answer sizing questions at any hour

Because drivers check at night after noticing something, the same fit anxiety as size and fit questions that cause boutique returns and the coverage question in answering service area questions.

Getting started

Publish how to find the correct size, your all in price per size and offer a registration check, then answer at any hour. SpideyChat for automotive businesses answers from your published pages, plans are on the pricing page, and the chatbot ROI calculator works through the numbers.

Frequently asked questions

How do you find the right tyre size?
By checking the vehicle manufacturer's recommendation as well as what is currently fitted, since the existing tyres may not be correct.
What do the numbers on a tyre mean?
They describe width, profile, rim diameter and ratings for load and speed, all of which matter for correct fitment.
Can you fit different tyres to the front and rear?
Sizes can differ where a manufacturer specifies it, and mixing inappropriately can affect handling and safety, so it should be checked.

Want a 24/7 AI Employee for Your Website?

See how SpideyChat can answer customer questions, capture leads and handle enquiries while your team is offline.

No obligation. We will review your website and show you how SpideyChat could work for your business.

Keep reading