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Optionally, tires with a maximum speed of over 149 mph (240 km/h) may have "ZR" in the size description, depending on the manufac- turer (e.g. 245/40 ZR 18). Rim diameter: rim diameter ? is the diam- eter of the bead seat, not the diameter of the rim flange. The rim diameter is specified in inches (in). Load-bearing index: load-bearing index A is a numerical code that specifies the maxi- mum load-bearing capacity of a tire. Do not overload the tires by exceeding the specified load limit. The maximum permis- sible load can be found on the vehicle's Tire and Loading Information placard on the B-pillar on the driver's side ( Y page 185). Example: Load-bearing index 91 indicates a maximum load of 1,356 lb (615 kg) that the tires can bear. For further information on the maximum tire load in kilograms and lbs, see ( Y page 193). For further information on the load bearing index, see "Load index" ( Y page 193). Speed rating: speed rating B specifies the approved maximum speed of the tire. i Tire data is vehicle-specific and may deviate from the data in the example. Regardless of the speed rating, always observe the speed limits. Drive carefully and adapt your driving style to the traffic con- ditions. Summer tires Index Speed rating Q up to 100 mph (160 km/h) R up to 106 mph (170 km/h) S up to 112 mph (180 km/h) T up to 118 mph (190 km/h) H up to 130 mph (210 km/h) V up to 149 mph (240 km/h) W up to 168 mph (270 km/h) Y up to 186 mph (300 km/h) ZR...Y up to 186 mph (300 km/h) Index Speed rating ZR...(..Y) over 186 mph (300 km/h) over 149 mph (240 km/h) R Optionally, tires with a maximum speed of over 149 mph (240 km/h) may have "ZR" in the size description, depending on the manu- facturer (e.g. 245/40 ZR18). The service specification is made up of load-bearing index A and speed rating B. R If the size description of your tire includes "ZR" and there are no service specifications, ask the tire manufacturer in order to find out the maximum speed. If a service specification is available, the maximum speed is limited according to the speed rating in the service specification. Example: 245/40 ZR18 97 Y. In this example, "97 Y" is the service specification. The letter "Y" represents the speed rating. The maximum speed of the tire is limited to 186 mph (300 km/h). R The size description for all tires with maximum speeds of over 186 mph (300 km/h) must include "ZR", and the service speci- fication must be given in parentheses. Example: 275/40 ZR 18 (99 Y). Speed rating "(Y)" indicates that the maximum speed of the tire is over 186 mph (300 km/h). Ask the tire manufacturer about the maximum speed. All-weather tires and winter tires Index Speed rating Q M+S 2 up to 100 mph (160 km/h) T M+S 2 up to 118 mph (190 km/h) H M+S 2 up to 130 mph (210 km/h) V M+S 2 up to 149 mph (240 km/h) i Not all tires with the M+S marking pro- vide the driving characteristics of winter tires. In addition to the M+S marking, win- ter tires also have the i snowflake sym- bol on the tire wall. Tires with this mark- ing fulfill the requirements of the Rubber Manufacturers Association (RMA) and the 2 Or M+S i for winter tires. 192 All about wheels and tires >> Wheels and tires. |