2008 Mercedes S-Class Owner's Manual - Page 572

Operation Tires and wheels Any 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. All-season and winter tires Index Q M+S T 1 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 (RAC) and have been designed specifically for use in snow conditions. Load identification 1 Load identification Speed rating up to 100 mph (160 km/h) up to 118 mph (190 km/h) i For illustration purposes only. Actual data on tires are specific to each vehicle and may vary from data shown in above illustration. M+S1 H M+S1 up to 130 mph (210 km/h) V M+S1 up to 149 mph (240 km/h) 1 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 ( page 568). No specification given: absence of any text (like in above example) indicates a standard load (SL) tire. XL (Extra Load): designates an extra load (or reinforced) tire. or M+S.for winter tires 571