What do the letters in tire ratings represent?
1 Answers
Tire rating letters indicate the speed rating of the tire. Below is a detailed explanation of the tire letter ratings: 1. The letters corresponding to speed ratings represent the speed grade of the tire, which indicates the speed at which the tire can carry a specified load under defined conditions. Tires are rubber products mounted on metal rims that roll on the ground, fitted to vehicles or machinery. 2. Letters from A to Z represent certified speed ratings for tires ranging from 4.8 km/h to 300 km/h. Common speed ratings include: Q-160 km/h; R-170 km/h; S-180 km/h; T-190 km/h; H-210 km/h; V-240 km/h; W-270 km/h; Y-300 km/h; Z: ZR speed above 240 km/h.