Here are the meanings of tire 100h: 1 and 100h marked on the tire. These are the load and speed of the tire, and the digital part is the load index of the tire. 2. 100 indicates that the load capacity at the rated speed is 800KG, the letter part is the speed grade of the tire, and h is the maximum speed that the tire can support under the rated load, which is 240KM\u002FH. 3. When selecting the tire load index, it should be calculated according to the vehicle mass 1.5 times. For example, 100 represents a load index of 800kg, and the average family car has four tires, which is 3200kg when multiplied by 4. According to the calculation of 1.5 times, four tires with load index of 100 can carry 265433. The vehicle speed should be selected according to the actual situation and the performance parameters of the vehicle, which has nothing to do with the number of tires.