What do the tire speed rating codes represent?
2 Answers
Tire speed rating codes are introduced as follows: 1. a1 to a8 represent 5 to 40 kilometers per hour, b represents 50 kilometers per hour, c represents 60 kilometers per hour, d represents 65 kilometers per hour, e represents 70 kilometers per hour, f represents 80 kilometers per hour, g is 90 kilometers per hour. 2. j is 100 kilometers per hour, k is 110 kilometers per hour, l is 120 kilometers per hour, m is 130 kilometers per hour, n is 140 kilometers per hour, p is 150 kilometers per hour. 3. q is 160 kilometers per hour, r is 170 kilometers per hour.
The speed rating code on tires is a lowercase or uppercase letter indicating the maximum safe speed the tire can withstand. Having driven for many years and changed numerous tires, I always pay special attention to this marking when selecting new ones. For example, S stands for 180 km/h, H for 210, V for 240, and higher-end tires may reach W or Y, exceeding 270. These letters are typically marked on the tire sidewall, combined with other numbers like 195/65R15 91V, where V represents the speed rating. If the speed rating doesn't match the vehicle's recommended level, high-speed driving can cause overheating, deformation, or even blowouts. I recommend that car owners regularly check tire wear and choose a speed rating that suits their driving habits if they frequently drive on highways. For general family cars, V or H is usually sufficient, but performance cars require higher ratings to avoid significant safety risks.
