Modern Tire Dealer

Handbook 2019

Magazine for the professional tire industry

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32 P e r f o r m a n c e H a n d b o o k 2 0 1 9 TRANSLATING SIDEWALLS R e a d i n g T i r e s ART COURTESY OF WWW.TIRERACK.COM Identification of tire age EXAMPLE: XX B3 ABCD 2718 Tire age has become a hot topic. To determine when the tire was produced, check out the manufacturers' vehicle identification numbers (VIN) stamped into the sidewall. Find the Tire Identifi- cation Numbers (TIN), which identify when the tire was made. The U.S. Department of Trans- portation (DOT) National Highway Traffic Safety Administration (NHTSA) requires that Tire Identification Num- bers be a combination of the letters DOT, followed by eight to 13 letters and/or numbers that identify the manufacturing location (XX), tire size code (B3) and manufacturer's code (ABCD), along with the week and year the tire was manufactured. e first two numbers identify the week (27) and the final two numbers identify the year of manufacture (18). is tire was produced in the 27th month of 2018. SOURCE: WWW.TIRERACK.COM Speed ratings All tires have speed ratings, and any with at least an S-speed rating is considered a performance tire. Performance tire speed rating/maximum speed (in miles per hour) S = 112 Family sedans and vans T = 118 Family sedans and vans H = 130 Sport sedans and coupes V = 149 Sport sedans, coupes and sports cars W = 168 Exotic sports cars Y = 186 Exotic sports cars (Y) = >186 Exotic sports cars Z = > 149 Exotic sports cars "When Z-speed rated tires were first introduced, they were thought to reflect the highest tire speed rating that would ever be required, in excess of 240 km/h or 149 mph," says TR Wholesale Solutions on www.tirerack.com. "While Z-speed rated tires are capable of speeds in excess of 149 mph, how far above 149 mph was not identified. at ultimately caused the automotive industry to add W- and Y-speed ratings to identify the tires that meet the needs of vehicles that have extremely high top-speed capabilities." Example size: 225 / 45 R 17 91 V 225 = The first three numbers are the tire's indicated section width in millimeters, measured from sidewall to sidewall. 45 = The second pair of numbers is the tire's aspect ratio or profile. This is a percentage representing the ratio of the sidewall's section height to the tire's section width. R = Radial construction 17 = This number is the diameter of the wheel in inches. 91 = Load index – here 1,356 pounds V = Speed rating – here a maximum speed of 149 mph COURTESY OF YOKOHAMA TIRE CORP.

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