Tyre Size Finder and Tyre Size Decoder
Decode the numbers on your tyre sidewall, explore common tyre sizes for popular UK car models, or send your registration to our team for a fitment check before ordering.
Example: 205/55 R16. Enter the values exactly as printed on your tyre sidewall.
The database shows common examples, not a guaranteed fitment for every trim or wheel option. Always verify before buying.
This page does not connect to a live DVLA vehicle database. Your registration will be added to a WhatsApp message so our team can help confirm the correct size.
How to read a tyre size
A tyre marked 205/55 R16 91V contains several separate measurements and ratings. The size tool explains the dimensions, but the load index and speed rating must also match your vehicle requirements.
The additional 91V is not part of the tyre dimensions. 91 is the load index and V is the speed symbol. Check the vehicle handbook or manufacturer placard for the required ratings.
Where to find your vehicle’s tyre size
Tyre sidewall
Look around the outer sidewall for a code such as 205/55 R16. The front and rear axle sizes may differ.
Driver’s door label
Check the label on the door frame or pillar. It often lists approved tyre sizes and recommended pressures.
Owner’s handbook
Use the manufacturer’s approved sizes for your exact model, year, trim and wheel package.
Existing tyre invoice
A previous invoice may list the fitted size, but verify it against the vehicle specification before ordering.
Why choosing the correct tyre size matters
- Handling and braking: incorrect fitment can affect steering response, grip and vehicle stability.
- Wheel compatibility: the tyre must be suitable for the wheel width and diameter.
- Load and speed ratings: ratings must meet the vehicle manufacturer’s requirements.
- Speedometer and clearance: changing overall tyre diameter can affect speed readings and cause rubbing.
- Legal compliance: tyres must be suitable for the vehicle and meet UK roadworthiness requirements.
If you are unsure, do not rely on a generic size list alone. Verify the exact fitment for your registration, trim and wheel setup before purchasing.
Tyre size finder FAQs
Does this tool guarantee the correct tyre size for my car?
No. The decoder explains the size you enter, while the car finder lists common examples for selected models. Different trims, wheel packages, model years and front/rear fitments can use different sizes. Confirm the exact specification with the vehicle handbook, tyre placard or a qualified tyre professional.
What does 205/55 R16 mean?
205 is the nominal tyre width in millimetres, 55 is the sidewall aspect ratio as a percentage of the width, R indicates radial construction, and 16 is the wheel rim diameter in inches.
What do 91V or similar characters mean?
The number is the load index and the letter is the speed symbol. They indicate the tyre’s rated load capacity and speed category. Choose ratings that meet the vehicle manufacturer’s specification; do not use a lower rating unless an approved exception applies.
Can I enter my registration to find the tyre size?
You can enter a UK registration here to send a fitment-check request by WhatsApp. Automated vehicle lookup is not enabled on this page. A true live lookup requires an authorised vehicle data service and a securely configured API integration.
Why are there several sizes listed for one car model?
A model can be sold with different wheel sizes, trim levels, engines and optional packages. Some performance cars also use staggered fitments, with different sizes on the front and rear axles. Match the exact vehicle specification rather than choosing from the list at random.
Where can I get help confirming a tyre size?
Send your registration, tyre size and vehicle details to the tyre team before ordering. You can also check the vehicle handbook and the tyre information label on the car.
Tyre size information is provided as a guide and is not a substitute for checking the vehicle manufacturer’s specification. Confirm size, load index, speed rating and axle fitment before ordering.