Car tyres come with a specific code written on the sidewall, which tells you all the important specifications of the tyre. Here’s how to read and understand it.
🔍 Example Tyre Code: 205/55 R16 91V
Let’s break it down:
✅ 1. 205 – Tyre Width (in mm)
- This is the section width of the tyre from sidewall to sidewall.
- So, 205 mm is the width of the tyre.
✅ 2. 55 – Aspect Ratio (%)
- This is the height of the tyre’s sidewall as a percentage of the width.
- 55% of 205 mm = 112.75 mm sidewall height.
✅ 3. R – Radial Construction
- “R” stands for Radial, the most common type of tyre construction today.
- Radial tyres have better grip, comfort, and durability.
✅ 4. 16 – Rim Diameter (in inches)
- This tyre fits on a 16-inch wheel (rim).
✅ 5. 91 – Load Index
- This indicates the maximum load the tyre can carry.
- 91 = 615 kg per tyre (check a load index chart for exact numbers).
✅ 6. V – Speed Rating
- This tells you the maximum speed the tyre is certified for.
- V = Up to 240 km/h.
✅ Additional Markings You May See:
| Code | Meaning |
|---|---|
| M+S | Mud and Snow (All-season or winter tyre) |
| XL | Extra Load (Can carry more weight) |
| DOT | Department of Transportation code – includes manufacturing date |
| E4 | European safety standard approval mark |
🔧 Summary of the Example Code (205/55 R16 91V)
| Feature | Value | Meaning |
|---|---|---|
| Width | 205 mm | Tyre tread width |
| Aspect Ratio | 55% | Sidewall height is 55% of 205 mm |
| Construction | R (Radial) | Radial ply construction |
| Rim Diameter | 16 inches | Fits a 16-inch rim |
| Load Index | 91 | Can support 615 kg |
| Speed Rating | V | Up to 240 km/h |
