How to Read a Tyre Size (Explained Simply)
Reading time: 3–4 minutes
If you’ve ever looked at the side of a tyre, you’ll see numbers that look something like this:
205/55 R16
Many drivers don’t know what these numbers mean, but they contain important information about your tyre.
Here’s a simple explanation of how tyre sizes work.
The Tyre Width
The first number is the tyre width.
Example: 205
This means the tyre is 205 millimetres wide from sidewall to sidewall.
Wider tyres can provide more grip, but they must match your vehicle’s specifications.
The Profile (Aspect Ratio)
The second number is the profile or aspect ratio.
Example: 55
This means the tyre height is 55% of the tyre width.
Lower profile tyres often provide sharper handling, while higher profiles can improve comfort.
The Tyre Construction
The letter in the size indicates the tyre construction.
Example: R
This means radial construction, which is used on almost all modern tyres.
The Wheel Size
The final number shows the wheel diameter.
Example: 16
This means the tyre fits a 16‑inch wheel.
You must always use tyres that match your wheel size.
How TyreroomDirect Helps
With TyreroomDirect you don’t need to worry about remembering tyre sizes.
- ✔ Enter your registration number
- ✔ See tyres that fit your car
- ✔ Choose fitting or delivery
- ✔ Book everything online
- ✔ 100% money‑back guarantee
Final Thoughts
Tyre sizes may look complicated, but they simply describe the tyre’s width, profile and wheel size.
If you’re unsure, entering your registration number on TyreroomDirect will show the correct tyres for your vehicle.
Finding the right tyres has never been easier.
