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  2. Tire code - Wikipedia

    en.wikipedia.org/wiki/Tire_code

    Prior to 1964, tires were all made to a 90% aspect ratio. Tire size was specified as the tire width in inches and the diameter in inches – for example, 6.50-15. [24] From 1965 to the early 1970s, tires were made to an 80% aspect ratio. Tire size was again specified by width in inches and diameter in inches.

  3. Formula One tyres - Wikipedia

    en.wikipedia.org/wiki/Formula_One_tyres

    As Formula One wheel rim diameter size will switch from 13 to 18 in (330 to 457 mm), the tyre diameter of 2022-spec Pirelli Formula One tyres will also be altered, from 670 to 720 mm (26.4 to 28.3 in), while the tread width of 2022-spec Pirelli Formula One tyres are expected to be unchanged.

  4. Pirelli - Wikipedia

    en.wikipedia.org/wiki/Pirelli

    The actual rim size remained unchanged from the traditional 13 inches. The faster cornering speeds as a result of this change imposed significantly increased loads on the tyres. Pirelli was consequently asked to produce tyres with less degradation that were more resistant to overheating, for the fastest cars in Formula One history. [50]

  5. Pirelli Cinturato - Wikipedia

    en.wikipedia.org/wiki/Pirelli_Cinturato

    A comparison between a standard tyre of the time and the Pirelli Cinturato. First developed in 1952 under the name Pirelli Cintura, taking the name Cinturato in 1963, the tyre was composed of two or three carcass plies of cords laid at an angle of 90 degrees to the beads, and a belt of several plies laid circumferentially under the tread ...

  6. List of tire companies - Wikipedia

    en.wikipedia.org/wiki/List_of_tire_companies

    Panther Tyres [64] Pakistan: 1983 [65] Panther Tyres, Panther Tubes, Panther Lubricants, Panther Auto Parts Petlas Turkey: 1976 Petlas: Pirelli [66] [67] Italy: 1872 Agom, Courier, Metzeler, Pirelli, Formula [68] Ralf Bohle GmbH Germany: 1922 Schwalbe, Impac Rosava Ukraine: 1972 Rosava,Itegro Rupsha Tyres Bangladesh: 1991 Rupsha Asia, Tajwer ...

  7. European Tyre and Rim Technical Organisation - Wikipedia

    en.wikipedia.org/wiki/European_Tyre_and_Rim...

    ETRTO sizes apply to rims and tyres for vehicles of all types, including bicycles. The great advantage of ETRTO sizing is that it is unambiguous; previously, nominal dimensions were used which were interpreted in different ways by different countries and manufacturers - a problem for the end user.

  8. Wheel sizing - Wikipedia

    en.wikipedia.org/wiki/Wheel_sizing

    Modern road tires have several measurements associated with their size as specified by tire codes like 225/70R14. The first number in the code (e.g., "225") represents the nominal tire width in millimeters. This is followed by the aspect ratio (e.g.,"70"), which is the height of the sidewall expressed as a percentage of the nominal tire width.

  9. ISO 5775 - Wikipedia

    en.wikipedia.org/wiki/ISO_5775

    ISO 5775 is an international standard for labeling the size of bicycle tires and rims. The system used was originally developed by the European Tyre and Rim Technical Organisation (ETRTO). It is designed to make tire sizing consistent and clear. It replaces overlapping informal systems that ambiguously distinguished between sizes.

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