轮胎尺寸标记
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定义
轮胎尺寸以'宽度/扁平比 R 直径'的格式编码（例如205/55 R16），其中宽度单位为毫米，扁平比为胎侧高度占宽度的百分比，直径为轮辋尺寸（英寸）。
解释
A tire marked 205/55 R16 has a tread width of 205 mm, a sidewall height of 113 mm (55% of 205), fits a 16-inch rim, and has a total outer diameter of approximately 632 mm. The mixed-unit format — metric width and percentage, but imperial rim diameter — reflects the tire industry's historical evolution across US and European standards. Load index and speed rating letters are often appended (e.g., 91V), indicating maximum load and speed.
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