How to Read and Understand Tyre Size Labels

If you’ve ever looked at the side of your car’s tyre and wondered what all those numbers and letters mean, you’re not alone. Understanding tyre size labels can seem confusing at first, but once you know what each part represents, it’s actually pretty straightforward.

Whether you're browsing tyres online or checking out options like Continental tyres, knowing how to read the size label helps you pick the right fit for your vehicle—and drive safely.

What Is a Tyre Size Label?

A tyre size label is the series of numbers and letters printed on the sidewall of every tyre. It tells you important details about the tyre’s dimensions, structure, and capabilities.

You might see something like: 205/55 R16 91V

Let’s break that down.

What Do the Numbers and Letters Mean?

Here’s what each part of the tyre size means:

1. Tyre Width (205)

• This is the width of the tyre in millimetres, measured from sidewall to sidewall.
• In this case, the tyre is 205 mm wide.

2. Aspect Ratio (55)

• This is the height of the sidewall as a percentage of the width.
• A ratio of 55 means the sidewall height is 55% of 205 mm.
• Lower numbers (like 40) usually mean sportier performance, while higher numbers offer more comfort.

3. Tyre Construction (R)

• The letter “R” stands for Radial construction, which is the most common type today.
• It means the tyre’s internal layers are arranged radially across the tyre.

4. Rim Diameter (16)

• This is the diameter of the wheel rim in inches.
• A tyre with a 16 means it fits a 16-inch wheel.

5. Load Index (91)

• This number indicates the maximum load capacity the tyre can carry.
• For example, 91 corresponds to 615 kg per tyre.
• Always check your vehicle’s manual to match the correct load index.

6. Speed Rating (V)

• This letter shows the maximum speed the tyre can handle safely.
• “V” means up to 240 km/h (149 mph).
• Other common ratings:
  • T = 190 km/h
  • H = 210 km/h
  • W = 270 km/h

Why Tyre Size Matters

Using the wrong tyre size can affect your vehicle’s:

• Handling and safety
• Fuel efficiency
• Ride comfort
• Brake performance

That’s why when you’re shopping for trusted brands like Continental, it’s important to double-check the tyre label and make sure it matches your car’s specifications.

Where to Find the Right Tyre Size

You can find your vehicle’s recommended tyre size in a few places:

• Inside the driver’s side door frame
• In your owner’s manual
• On your current tyre’s sidewall

If you’re unsure, websites that sell Continental and other top tyre brands often let you search by vehicle make and model, so you can’t go wrong.

Quick Tips Before You Buy Tyres

• Don’t just go for looks—choose a tyre size based on your driving needs.
• Double-check both the load index and speed rating.
• Consider the climate and road conditions in your area.
• If you’re switching brands, compare the label details side-by-side.

Final Thoughts

Tyres do more than just keep your car rolling—they directly impact your safety, comfort, and performance. Learning how to read a tyre size label helps you make better decisions, whether you’re upgrading to premium brands like Continental, or just replacing a worn-out set.

Take a minute to check your tyres today—it’s one of the easiest ways to stay in control on the road.