When you look closely at your motorcycle tyre, you’ll notice a variety of numbers, letters, and symbols imprinted on the sidewall. These markings are not just for decoration. They contain important information about the tyre’s size, speed rating, load capacity, and even the date it was manufactured.

Understanding these symbols is crucial for every rider. Choosing the wrong tyre size or ignoring the load index could affect your safety and your bike’s performance. Here’s a guide to help you decode these markings.

symbols on motorcycle tyres

1. Tyre Size

Example: 130/80 ZR17

  • 130 – Tyre width in millimetres.

  • 80 – Aspect ratio (percentage of tyre’s height to its width).

  • ZR – Tyre construction and speed rating (Z = high speed, R = radial).

  • 17 – Rim diameter in inches.

Choosing the correct tyre size ensures proper handling and stability while riding.

tyre size

2. Load Index

Example: 73

The load index shows the maximum weight the tyre can safely carry when inflated properly. The higher the number, the greater the load capacity.

load index

3. Speed Rating

Example: S

This letter indicates the maximum speed at which the tyre can carry its rated load. For example:

  • S – Up to 180 km/h

  • H – Up to 210 km/h

  • W – Up to 270 km/h

speed rating

4. Tyre Type

You may see letters such as:

  • TT – Tube Type (requires an inner tube)

  • TL – Tubeless (does not require an inner tube)

tyre type

5. Manufacture Date

Example: DOT 3120

The last four digits represent the week and year of manufacture. In this example:

  • 31 – 31th week of the year

  • 20 – Year 2020

Tyres older than 5 years should be checked regularly for safety.

manufacture date

6. Rotation Arrow

This arrow shows the direction in which the tyre should be mounted. Installing it in the wrong direction may affect grip and water dispersion.

rotation arrow

7. TWI (Tread Wear Indicator)

This small marking shows where you can check the tyre’s tread depth. If the tread is worn down to the indicator, it’s time to replace the tyre.

TWI (Tread Wear Indicator)

Final Tip for Riders

Before replacing your motorcycle tyre, always check the manufacturer’s recommendation in your owner’s manual. Using tyres with incorrect specifications can reduce braking efficiency, affect cornering stability, and even cause accidents.

By understanding these symbols, you can ensure your motorcycle runs safely and performs at its best.