Mastering The Motorcycle Tire Numbers Confidently

Keeping your motorcycle in tip top shape means knowing how to maintain and even replace tires when the time calls for it. Motor cycle tires come with certain numbers and knowing how to decipher those numbers is important. This piece provides the reader with important motorcycle tire numbers and their meanings to assist the reader in enhancing the performance and safety of the motorcycle.

Interpreting Motorcycle Tire Numbers Annualy

Tire Size Designation

For example, most motorcycles come with tires with the numbers in the format 120/70 ZR 17 58W . The format of the tire will deviate depending on the motorcycle.

120 - In the example, this is the tire measuring 120 millimeters wide

70 - The second number is used to indicate the aspect ratio which is used to measure height in terms of a certain percentage of a tire’s width.

ZR - This is the construction type and speed rating . ZR means radial construction and it is designed for high speed.

17 - This is the wheel diameter in inches that can take this specific type of tire.

58 : Each tire's load capacity index is expressed in numbers starting from 0.

W : Each tire's max speed when driven optimally is expressed as a single letter ‘W’.

A motorbike tire's grip and balance is classified as better with a wider tire. and so is the cross section over it’s sidewall in millimeters. This may have an insignificiant impact on the way the motorcycle is controlled or the amount of fuel consumed.

The sidewall's height in relation to the tire's width is termed an aspect ratio . A tire with a low ratio is said to be more stable. A higher ratio tires on the other hand imply greater comfort.

Type of Construction (ZR)

The first classification of tires is the way of construction element.

Radial (R) is when the tire has plies in a cross position and aids in better performance but provides good stability while driving.

Bias ply (B) is when the tire has loose accuracy and softer ride.

This is the tire already mounted on the motorcycle and the diameter of the wheel in inches. This will be the same measurement as the motorcycle’s rim size.

Each vehicle’s tire pressure determines how much weight the tire can hold which is termed the load index . For example, a load index of 58 translates to 520 pounds.

Each tire is given a top speed rating which is denoted by a single letter, e.g. “W” rated means up to 168 mph. Therefore, lower the 168mph rated tires will not suit you and motorcycle will have to altered to suit these tires.

Load Index and Speed Rating

To understand weight limits better, here is an easy load index chart:

A quick reference for load rating below:

Matters Arising from Matching Tire Numbers

Safety and Performance

Using motorcycle tires of the right specifications guarantees maximum security as well as performance. Drive, at high speed, reckless maneuvering, poor tire pressure , and incorrect tire sizes or types can lead to loss of control of the motorcycle.

In some regions, motorcycles have legal limits for the tires used regarding the specific speed ratings and loads of the tires. In this case, it is crucial that your tires comply with the standards for legal protection and avoidance of fines, penalties, and other listable repercussions.

Common Mistakes When Interpreting Tire Numbers

Ignoring the aspect ratio

Ignoring the aspect ratio which affects ride comfort and handling is perhaps the most common mistake tire users make. If you intend to purchase a tire, do check the aspect ratio.

Misunderstanding speed and load ratings