Service FordContact Would you have known? Take a closer look at the sidewall of a tyre and you’ll see a number of markings and symbols. But what do they all mean? FordContact asked Bridgestone to unravel the mystery. Like the tread profile of a tyre, the many symbols and mark ings on the sidewall of a tyre are required by law. European, American and national regulations have to be complied with. Very Important The sidewall of a tyre reveals sometimes in code form details such as manufacturer’s name, product description, safety instructions, construction type, production date, quality grade and much more. The most significant features for a dealer operation are the ECE Approval symbol (a capital ”E“ in a circle) and the size designation which is made up of several indicators (see information box). Together with the load capacity index and speed symbol, they all tell whether the tyre may be fitted to a particular vehicle or not. Positive Characteristics 205/50 R 15 86 V Particular characteristics are also marked on the sidewall. These are for instance “Tubeless” for tyres without inner tubes, “Reinforced” or “Extra Load” for high load tyres and the letters “M” and “S” for winter and all season tyres. An arrow indicates the correct direction of tyre rotation on directional tyres. Tyres with asymmetric tread profiles have markings showing which side should be on the outer side of the vehicle (e.g. Outside). Small Print Right on the outer edge of the sidewall you’ll find the markings indicating the position of Tread Wear Indicators (TWI). These markings different by manufacturer can be triangles, small company logos or the letters “TWI”. 205 Tyre width (nominal measure): 205 mm 50 R 15 86 V Aspect ratio (tyre height to tyre width): 50 % Tyre construction: Radial Wheel diameter: 15 Inch Load Index: 530 kg Speed category: 240 km/h What the Size Designation reveals Load Index (LI) Codes LI Code Maximum tyre load capacity in kg 82 83 84 475 487 500 515 530 545 560 580 600 615 630 650 670 690 710 730 750 775 800 Speed Category Symbol (SSY) Codes SSY Code Q R S T U H V W Y Maximum speed in km/h 160 170 180 190 200 210 240 270 300 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 13
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