How to read your motorcycle tyre

Motorcycle tyres have specific markings on their sidewalls that indicate their size, construction, load-bearing capacity, and speed rating. Understanding these markings is crucial for selecting the right tires for your motorcycle and ensuring safe riding.

Tire Size:

Width:

The first number (e.g., 180 in 180/55ZR17) represents the tire's width in millimeters.

Aspect Ratio:

The second number (e.g., 55 in 180/55ZR17) is the aspect ratio, which is the height of the sidewall as a percentage of the tire's width.

Wheel Diameter:

The last number (e.g., 17 in 180/55ZR17) indicates the diameter of the wheel rim in inches.

Construction:

Radial (R):

Most modern motorcycle tires use radial construction, which provides better handling and performance.

Bias ( - or B):

Some tires use bias or bias-belted construction, which may be suitable for certain applications.

Load and Speed Ratings:

Load Index:

A number (e.g., 73 in 180/55ZR17 (73W)) indicates the maximum weight the tire can carry at its maximum inflation pressure.

Speed Rating:

A letter (e.g., W in 180/55ZR17 (73W)) indicates the maximum speed the tire is designed to handle.

Other Markings:

DOT: The DOT marking indicates that the tire meets US Department of Transportation safety standards.

Date Code: The DOT code also includes a date code indicating the week and year of manufacture.

Direction: An arrow on the sidewall indicates the correct direction of rotation.