What Does Motorcycle Tire Specification Represent?
2 Answers
Motorcycle tire specification "b-d" indicates that b is the tire's section width, d is the tire's inner diameter which is also the rim diameter, both measured in inches, and the "-" in between denotes a low-pressure tire. Below is an introduction to motorcycle tire specifications: 1. Tire inflation pressure value: The inflation pressure of motorcycle tires generally ranges between 147kpa to 343kpa. Sometimes, some tire specifications may also include a ply rating at the end, such as 2.75-17-4pr, indicating that the tire's section width is 2.75 inches, the inner diameter is 17 inches, and 4pr means the tire has 4 plies. 2. The role of the tire: It directly contacts the road surface and bears the weight of the vehicle body. Utilizing the elasticity after inflation, it cushions and partially absorbs vibrations and impacts caused by uneven road surfaces during driving.
As an experienced motorcycle enthusiast, tire specifications like 120/70R17 M/C 58H are a coded message revealing crucial details. Here's the breakdown: 120 indicates the tire width in millimeters (120mm), directly affecting grip and cornering stability; 70 is the aspect ratio, meaning the height is 70% of the width—too low risks blowouts, too high compromises comfort; R stands for radial construction, enhancing durability and fuel efficiency; 17 is the wheel diameter in inches, which must match your bike or it won't fit; M/C confirms it's motorcycle-specific, unlike car tires; 58 is the load index, supporting up to ~236kg; H is the speed rating, with a max of 210km/h. Choosing the wrong specs can destabilize handling or cause accidents. I always cross-check with the manual before buying new tires—safety first.
