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  2. Rolling resistance - Wikipedia

    en.wikipedia.org/wiki/Rolling_resistance

    The Society of Automotive Engineers (SAE) has developed test practices to measure the RRC of tires. These tests ( SAE J1269 and SAE J2452 ) are usually performed [ citation needed ] on new tires. When measured by using these standard test practices, most new passenger tires have reported RRCs ranging from 0.007 to 0.014."

  3. Wheel sizing - Wikipedia

    en.wikipedia.org/wiki/Wheel_sizing

    The wheel size is the size designation of a wheel given by its diameter, width, and offset. The diameter of the wheel is the diameter of the cylindrical surface on which the tire bead rides. The width is the inside distance between the bead seat faces. The offset is the distance from the wheel's true centerline (half the width) to the wheel's ...

  4. SAE J1269 - Wikipedia

    en.wikipedia.org/wiki/SAE_J1269

    SAE J1269 is a standard test defined by the Society of Automotive Engineers to measure the rolling resistance of tires under conditions of thermal equilibrium. [2] [3] SAE J2452 is an alternative procedure for measuring rolling resistance under conditions similar to a vehicle coastdown event, where the tire is in a roughly isothermal condition ...

  5. 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. [34] 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.

  6. Tire uniformity - Wikipedia

    en.wikipedia.org/wiki/Tire_uniformity

    Tire uniformity refers to the dynamic mechanical properties of pneumatic tires as strictly defined by a set of measurement standards and test conditions accepted by global tire and car makers. These standards include the parameters of radial force variation , lateral force variation , conicity, ply steer, radial run-out , lateral run-out , and ...

  7. SAE International - Wikipedia

    en.wikipedia.org/wiki/SAE_International

    SAE International is a global professional association and standards organization based in Warrendale, Pennsylvania, United States.Formerly the Society of Automotive Engineers, the organization adopted its current name in 2006 to reflect both its international membership and the increased scope of its activities beyond automotive engineering and the automotive industry to include aerospace and ...

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