![]() Many performance cars require Z-rated tires, even though they might not be capable of 187 mph. Your owner’s manual will let you know what speed rating you need for your vehicle. Tires designed to go faster than this are sometimes marked as “(Y)” and sometimes as “Z.” The highest rating is Y, which is 186 mph, or 300 kph. The M speed rating guarantees a tire’s safety up to 81 mph with safe tread depth, while inflated to the factory mandated PSI. Most road-going, automotive tire speed ratings start with M. Speed ratings A1-A8, B, C, D, and E each increase by 5 kph per rating, while F through Y each increase by 10 kph. So while the numbers may seem random in miles per hour, the global standard chart looks nice and neat. Since this system is borrowed from the Euro standard, each speed rating increases by 5 or 10 kilometers per hour. The US Department of Transportation specifies no fewer than 32 different tire speed ratings. You probably already put this together, but speed rating refers to a tire’s safe top speed, sustainable for a reasonable length of time. The 94 is for load index, which indicates the weight category the tire can carry at its factory recommended PSI. This code, made up of a number and a letter, includes two pieces of information. If you go outside right now and look at the tires on your car, you’ll find the service indicator. ![]() Here’s everything you need to know about that single letter you can find on any road tire. ![]() If you’ve ever started digging deep into tire comparisons, especially while shopping for off-road tires, you might have seen the term speed rating.
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