Understanding the markings on a motorcycle tire sidewall is crucial for selecting the correct replacement and ensuring optimal performance. These alphanumeric codes provide vital information about the tire’s dimensions, construction, load capacity, and speed rating. For example, a typical tire designation such as “120/70-17 M/C 58H” decodes to a tire with a section width of 120 millimeters, an aspect ratio of 70%, a radial construction suitable for motorcycle use, a rim diameter of 17 inches, a load index of 58, and a speed rating of H.
Accurate interpretation of these codes prevents mismatches that can negatively impact handling, stability, and safety. Correct tire size influences speedometer accuracy and ground clearance. Historically, tire sizing conventions have evolved, with metric designations becoming increasingly common, superseding older inch-based systems. Adhering to the manufacturer’s recommended tire specifications, found in the motorcycle’s owner’s manual or on the tire placard, is paramount for safe and predictable motorcycle operation.