2009 Mercedes SL-Class Owner's Manual - Page 228

Operation Tires and wheels 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. All-season and winter tires Index Q M+S9 T M+S9 H M+S9 V M+S9 Speed rating up to 100 mph (160 km/h) up to 118 mph (190 km/h) up to 130 mph (210 km/h) up to 149 mph (240 km/h) (RAC) and have been designed specifically for use in snow conditions. An electronic speed limiter prevents your vehicle from exceeding a speed of: R155 - any authorized Mercedes-Benz Center will be glad to assist you. mph (250 km/h): Load identification SL 550 SL 550 (Sport Package) SL 600 SL 600 (Sport Package) SL 63 AMG SL 65 AMG mph (300 km/h): 1 Load identification R186 - SL 63 AMG (Performance Package) SL 65 AMG with increased top speed i Not all M+S rated tires provide special winter performance. Make sure the tires you use show M+S and the mountain/ snowflake.marking on the tire sidewall. These tires meet specific snow traction performance requirements of the Rubber Manufacturers Association (RMA) and the Rubber Association of Canada 9 The factory equipped tires on your vehicle may have a tire speed rating above the maximum speed permitted by the electronic speed limiter. Make sure your tires have the required tire speed rating as specified for your vehicle in the "Technical data" section (Y page 343), for example when purchasing new tires. If you are uncertain about the correct reading of the information given on a tire's sidewall, i For illustration purposes only. Actual data on tires are specific to each vehicle and may vary from data shown in above illustration. In addition to tire load rating, special load identification 1 may be molded into the tire sidewall following the letter designating the tire speed rating 6 (Y page 224). or M+S.for winter tires 226