A clear guide to the sidewall details that make a replacement enquiry more accurate.
A mobile tyre enquiry is easier when the fitter has the full specification. Saying it is a 17-inch tyre identifies only part of the information needed. The details on the sidewall help narrow the options, but the vehicle's approved specification still matters.
Understand the main markings
In an example such as 225/45 R17 94W, 225 is the width in millimetres, 45 is the aspect ratio and 17 is the wheel diameter in inches. R identifies radial construction; the following number and letter describe load index and speed rating. Continental's size guide explains these markings.
Take a useful photograph
Photograph the full sequence rather than only the brand name. Include any additional markings that the fitter asks about. If you cannot safely access the sidewall, send the registration and explain the situation instead of moving the vehicle solely for a photograph.
Check more than one wheel
Record the front and rear markings separately. Do not assume every wheel has the same specification, particularly if you have not owned the vehicle from new. The fitter should confirm the required fitment against the vehicle manufacturer's guidance, rather than relying only on what is currently installed.
Describe your priorities
Tell the provider whether you are comparing value, everyday use or a particular tyre type. Ask which available options meet the required specification and what is included in the fitted price. A cheaper option is meaningful only when you are comparing suitable products and equivalent services.
Avoid a preventable delay
Before confirming an appointment, repeat the agreed size and specification back to the provider. Supply the location and the affected wheel. This helps catch a misread number before stock is selected.
Is my registration enough?
It is a useful starting point, but a clear sidewall photo and manufacturer checks can resolve uncertainty. Treat these as supporting information, not interchangeable guarantees.
Questions about replacement tyre markings
Do front and rear tyre sizes always match?
Do not assume they do. Photograph or note the markings at both ends of the vehicle and ask the fitter to confirm the approved specification.
Should I order using only the wheel diameter?
No. Provide the complete marking and vehicle details. Width, aspect ratio and the required load and speed specification also matter.
What if my tyre markings are unreadable?
Send the registration and explain what you can safely access. Ask the provider to confirm the fitment rather than guessing a number.
Sources and further reading
For fitting enquiries, explore our car tyre services and mobile tyre fitters in Bolton. Explain the vehicle details and location so the team can confirm suitable options and availability.
