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What Do Motorcycle Tire Specifications Represent?

1 Answers

LeahDella

07/29/25 10:25pm

Typically, qualified tires are marked with specifications, maximum load, inflation pressure, standard rim, brand name, manufacturer, and direction. For example, if the outer tire is marked with the specification 90/90—1851S, the first 90 indicates a width of 90mm; the 90 after "/" represents the aspect ratio (%), meaning the height is 90% of the width; the 18 after "—" indicates the inner diameter of the tire is 18 inches (1 inch = 2.54 cm). Some tires do not display the aspect ratio, which implies an aspect ratio of 100%, meaning the width equals the height*. Here is some related information: 1. Specification Labeling Methods: There are two methods for labeling motorcycle tire specifications in China: one is the code notation method, and the other is the metric notation method. The code notation method uses "b－d" to represent the tire, where b is the tire's section width, d is the tire's inner diameter (also the tire's diameter), both measured in inches, and the "-" in between indicates a low-pressure tire. 2. Purchasing Motorcycle Tires: It is advisable to choose wider tires whenever possible because wider tires have a larger contact area with the ground, providing better traction. This enhances the transmission of driving force and braking force, allowing the engine's performance to be fully utilized and improving driving stability, comfort, and safety.

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