An optional letter indicating the speed rating of the tire. Alternatively, the letter may appear at the end, following the load index. If the letter here is Z, indicating a maximum speed in excess of 240 km/h (149 mph), then a more specific letter W or Y may appear after the load index (see speed rating, below). Then, there is the speed rating. Currently, there are more than a dozen speed ratings for tires offered in the United States. They range from “L,” which dictates a maximum speed of 75 mph, to “(Y),” which is for speeds in excess of 186 mph. These speed ratings are valid only when the tire is undamaged, properly inflated, and not overloaded. Speed ratings on tires are expressed in letters and are generally listed along with the load index for a tire after the size, for instance 245/40R18 93H. 93 is a load index and the "H" is the speed rating. When they were first created, Z-speed tires were meant to represent the highest tire speed rating ever — speeds that exceeded 149 miles per hour. What you might not know is that, since Z-speed tires were created, tires with even higher tire speed ratings have been introduced: enter the W-speed, Y-speed, and (Y) speed tires. People refer to that last letter of the tire size on the sidewall of your tires as ‘tire speed rating’—the maximum speed a tire can sustain for a certain period of time without risk of tire failure. Tire speed ratings range from A (the lowest) to Y (the highest). But the chart is not completely in alphabetical order. For example, H is between U and V, with the common perception that H stood for “high performance” at one time. The speed rating is a letter corresponding to the maximum safe speed at which a tire can be driven, as determined by laboratory testing. Tire speed ratings first originated in Europe in the 1960s, as a way to make sure increasingly faster vehicles were equipped with appropriate safe tires.
However, finding a tire's speed rating takes a bit of insider knowledge. Every tire has a service description, which probably looks like a jumble of letters and Many tires come with a service description added onto the end of the tire's size. These service descriptions contain a two-digit number (load index) and a letter (
17 Aug 2016 In this case, the 93 load index represents 1,433 pounds, and the speed rating of V represents 149 mph. Common Speed Ratings. Letter. L. M. N. Before buying tires, learn more about a tire's speed rating and load index. Use our tire finder to Letters on the sidewall are outlined in white. QUICK NOTE. 6 Apr 2012 The speed rating for a tyre is represented by an alphabet at the end of a combination of letters and numbers on the sidewall of the tyre. 16 Apr 2014 But do you know which letter, or tire speed rating, your tires should “It's a huge safety message,” said Alan Sidorov, a race car driver who also 23 Oct 2016 tl dr: If you don't tax your vehicle, this should not be an issue. I'll answer the second part of the question first What's a speed rating, anyway? H Speed ratings are represented by letters ranging from A to Z. Each letter coincides to the maximum speed a tire can sustain under its recommended load
However, finding a tire's speed rating takes a bit of insider knowledge. Every tire has a service description, which probably looks like a jumble of letters and Many tires come with a service description added onto the end of the tire's size. These service descriptions contain a two-digit number (load index) and a letter ( 19 Dec 2019 Each letter has a maximum speed designation and you'll usually see these letters on the walls of your tires, along with a series of numbers. Tires 26 Aug 2017 A speed rating is a letter or a combination of a letter and a number which implies to what extent the tire successfully dissipates heat. Exceeding Most passenger car tyre load indexes range from 62 to 126. The Speed Index is an assigned letter ranging from J to Z that corresponds to the reference Tire speed rating tells you the maximum service speed for a tire. A speed rating isn't, Letters on the sidewall are outlined in white. goodyear white letter tires.
26 Aug 2017 A speed rating is a letter or a combination of a letter and a number which implies to what extent the tire successfully dissipates heat. Exceeding Most passenger car tyre load indexes range from 62 to 126. The Speed Index is an assigned letter ranging from J to Z that corresponds to the reference Tire speed rating tells you the maximum service speed for a tire. A speed rating isn't, Letters on the sidewall are outlined in white. goodyear white letter tires.