1, ISO international quality certification expression method
250 / 60 R 15 89 H
250- tire width (mm), 60- flat ratio, R-meridian structure, 15- tire bore (in), 89- heavy load, H- high speed
2. DOT American representation
P 195 / 75 R 14 92 S
P-model abbreviation (bus PC), 195-tire width (mm), 75-flat ratio, R-meridian structure, 14-tire bore (in), 92- heavy load, S- high speed
Note: Flat ratio: the ratio of the height and width of the tire, the flatter the tire, the better the performance, the higher the cost.