2009 Mercedes CLS-Class Owner's Manual - Page 224
2009 Mercedes CLS-Class Manual
Page 224 highlights
Operation Tires and wheels Tire speed rating the tire manufacturer must be consulted for the maximum speed capability. If a service description 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). RAny G Warning! 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 serious personal injury and possible death, for you and for others. Regardless of the tire speed rating, local speed limits should be obeyed. Use prudent driving speeds appropriate to prevailing conditions. Tire speed rating 6 indicates the approved maximum speed for the tire. Summer tires Index Q R S Speed rating up to 100 mph (160 km/h) up to 106 mph (170 km/h) up to 112 mph (180 km/h) Index T H V W Y ZR...Y ZR...(..Y) ZR RAt Speed rating 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) up to 186 mph (300 km/h) above 186 mph (300 km/h) above 149 mph (240 km/h) 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 is comprised of tire load rating 5 and tire speed rating 6. If your tire includes "ZR" in the size designation and no service description is given, tire with a speed capability above 186 mph (300 km/h) must include a "ZR" in the size designation AND the service description must be placed in parenthesis. Example: 275/40 ZR 18 (99Y). The "(Y)" speed rating in parenthesis designates the maximum speed capability of the tire as being above 186 mph (300 km/h). Consult the tire manufacturer for the actual maximum permissible speed of the tire. Speed rating up to 100 mph (160 km/h) up to 118 mph (190 km/h) All-season and winter tires Index Q M+S8 T M+S8 8 or M+S.for winter tires 222