2006 Mercedes SL-Class Owner's Manual - Page 304

Operation Tires and wheels Tire speed rating The tire speed rating 6 ( page 301) indicates the approved maximum speed for the tire. Warning! Summer tires Index Q R S T Even when permitted by law, never operate a vehicle at speeds greater than the maximum speed rating of the tires. Exceeding the maximum speed for which tires are rated can lead to sudden tire failure, causing loss of vehicle control and possibly resulting in an accident and/or personal injury and possible death, for you and for others. Speed rating up to 100 mph (160 km/h) up to 106 mph (170 km/h) up to 112 mph (180 km/h) up to 118 mph (190 km/h) up to 130 mph (210 km/h) up to 149 mph (240 km/h) up to 168 mph (270 km/h) up to 186 mph (300 km/h) above 186 mph (300 km/h) above 149 mph (240 km/h) is comprised of the tire load rating 5 ( page 301) and the tire speed rating 6 ( page 301). If your tire includes "ZR" in the size designation and no service description 5 and 6 ( page 301) is given, the tire manufacturer must be consulted for the maximum speed capability. If a service description 5 and 6 ( page 301) is given, the speed capability is limited by the speed symbol in the service description. Example: 245/40 ZR18 97Y. In this example, "97Y" is the service description. The letter "Y" designates the speed rating and the speed capability of the tire is limited to 186 mph (300 km/h). G H V W Y (Y) ZR i Tire load rating 5 ( page 301) and tire speed rating 6 ( page 301) are also referred to as "service description". At the tire manufacturer's option, any tire with a speed capability above 149 mph (240 km/h) can include a "ZR" in the size designation (for example: 245/40 ZR18). To determine the maximum speed capability of the tire, the service description for the tire must be referred to. The service description 303