🚗 Why It Matters
Knowing your correct tyre size isn’t just about getting a good fit — it’s essential for safety, performance, and even insurance compliance here in the UK. Driving on incorrectly sized tyres could lead to MOT failures or even a fine.
Each axle tyre sizes must match and cannot be different each side.
Here’s how to find your tyre size in under 60 seconds.
🛞 1. Where to Look: The Tyre Sidewall
Your tyre size is written directly on the sidewall — the smooth rubber section between the tread and the wheel rim.
This is what your tyre size will look like on the sidewall.
Look for something that looks like this:
205/55 R16 91V
🧩 2. What the Numbers Mean
Here’s a quick breakdown of the code:
- 205 – The width of the tyre in millimetres
- 55 – The aspect ratio, meaning the sidewall height is 55% of the tyre’s width
- R – Stands for Radial construction (standard in the UK)
- 16 – The diameter of the wheel rim, in inches
- 91V –
- 91 is the load index (how much weight the tyre can safely carry)
- V is the speed rating (max speed the tyre is rated for)
🛑 Always make sure the load index and speed rating are equal to or greater than your car’s requirements. Some tyres will say ‘xl’ which means extra load rating often used on EV and heavier vehicles.
🔍 3. Can’t Read the Tyre? Try These:
If the sidewall is worn or unclear, check:
- Inside the driver’s door frame (look for a white or yellow sticker)
- The vehicle handbook
- Fuel filler flap (on some models)
- If you are looking at the flat tyre look at the other side on the same axle
These locations will show the manufacturer’s recommended tyre sizes — ideal for safe and legal driving.
📏 4. Why the Right Size Matters (UK Rules)
In the UK, fitting tyres that do not meet the manufacturer’s specification can:
- Invalidate your insurance
- Result in an MOT failure
- Affect handling and braking
- Lead to penalties or points if involved in an accident
✅ That’s why we always recommend checking before buying.
🧰 5. Need Help? Pop into Oxbys Autos
Bring your car in or snap a photo of your tyre sidewall, and our friendly team will:
- Decode your tyre size
- Recommend safe, legal replacements
- Fit them while you wait
📍 Visit us at: unit 32, armytage industrial estate, Whittington Moor, Old Whittington, Chesterfield S41 9ET
📞 Call us: 01246 720395
💻 Book online: https://www.oxbysautos.co.uk/contact/
📸 Visual Recap
Here’s what to look for on your tyre:
In Summary:
✅ Look for a code like 205/55 R16 91V
✅ Check your handbook or door sticker if unsure
✅ Make sure your new tyres meet or exceed that spec
✅ Ask Oxbys Autos for help if needed
