أرقام قياس الإطار
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التعريف
يُرمز لقياس الإطار بصيغة العرض/نسبة_الجانب R القطر (مثل 205/55 R16)، حيث العرض بالملليمتر، ونسبة الجانب هي ارتفاع الجدار الجانبي كنسبة مئوية من العرض، والقطر هو حجم حافة العجلة بالبوصة.
الشرح
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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