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  2. Tire code - Wikipedia

    en.wikipedia.org/wiki/Tire_code

    The last four numbers of the DOT marking on tires tell you the week (1 through 52) and year the tire was made. So, a tire with the last four digits of 0121 was made the first week of January 2021, 0221 is second week of January of 2021, and so on.

  3. Uniform Tire Quality Grading - Wikipedia

    en.wikipedia.org/wiki/Uniform_Tire_Quality_Grading

    The UTQG was created by the National Highway Traffic Safety Administration in 1978, a branch of the United States Department of Transportation (DOT). [1] All passenger car tires manufactured for sale in the United States since March 31, 1979 are federally mandated to have the UTQG ratings on their sidewall as part of the DOT approval process ...

  4. Tire uniformity - Wikipedia

    en.wikipedia.org/wiki/Tire_uniformity

    Some tire manufactures mark the sidewall with a red dot to indicate the location of maximal radial force and runout, the high spot. A yellow dot indicates the point of least weight. [1] Use of the dots is specified in Technology Maintenance Council's RP243 performance standard. To compensate for this variation, tires are supposed to be ...

  5. List of tire companies - Wikipedia

    en.wikipedia.org/wiki/List_of_tire_companies

    Titan Tire Corporation [80] USA: 1993 Goodyear (farm tires), Titan, Continental (OTR only) [81] Tigar Tyres Serbia: 1959 Tigar: Tomket Tires [82] [non-primary source needed] Czech Republic: 1997 Tomket (Czech brand of low category is made in China) Toyo Tire & Rubber [83] Japan: 1945 Nitto, Silverstone, Toyo: Trayal Corporation Serbia: 1955 ...

  6. SAE J2452 - Wikipedia

    en.wikipedia.org/wiki/SAE_J2452

    SAE J1269 and SAE J2452 performed on new tires. SAE J2452 is a standard defined by the Society of Automotive Engineers [1] to measure the rolling resistance of tires. [2] Where the older standard, SAE J1269, produces measurements of rolling resistance under steady-state (i.e. thermally equilibrated) operating conditions, SAE J2452 produces measurements during a transient history of speed that ...

  7. Douglas Tires - Wikipedia

    en.wikipedia.org/wiki/Douglas_Tires

    Goodyear registered the name in 1992 [1] through its subsidiary Kelly Springfield Tire Company. typical DOT code. The actual location [2] of manufacture of a Douglas tire can be determined through the first two characters following the "DOT" of the DOT code molded into the sidewall and consulting the NHTSA Manufacturers Information Database.