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  2. Tire code - Wikipedia

    en.wikipedia.org/wiki/Tire_code

    Prior to 1991, tire speed ratings were shown inside the tire size, before the "R" construction type. The available codes were SR (180 km/h, 112 mph), HR (210 km/h, 130 mph), VR (in excess of 210 km/h, 130 mph). Tires with a speed rating higher than 300 km/h (186 mph) are indicated by a Y in parentheses.

  3. Rolling resistance - Wikipedia

    en.wikipedia.org/wiki/Rolling_resistance

    When measured by using these standard test practices, most new passenger tires have reported RRCs ranging from 0.007 to 0.014." [6] In the case of bicycle tires, values of 0.0025 to 0.005 are achieved. [17] These coefficients are measured on rollers, with power meters on road surfaces, or with coast-down tests. In the latter two cases, the ...

  4. Uniform Tire Quality Grading - Wikipedia

    en.wikipedia.org/wiki/Uniform_Tire_Quality_Grading

    UTQG ratings (top) and tire code (bottom) on sidewall of Continental ContiProContact tire. Uniform Tire Quality Grading, commonly abbreviated as UTQG, is a set of standards for passenger car tires that measures a tire's treadwear, temperature resistance and traction. The UTQG was created by the National Highway Traffic Safety Administration in ...

  5. 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 ...

  6. Tire uniformity - Wikipedia

    en.wikipedia.org/wiki/Tire_uniformity

    The standard test speed for tire uniformity machines is 60 r/min of a standard load wheel that approximates 5 miles per hour. High speed uniformity machines are used in research and development environments that reach 250 km/h and higher. High speed uniformity machines have also been introduced for production testing.

  7. 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 ...

  8. Braking distance - Wikipedia

    en.wikipedia.org/wiki/Braking_distance

    Braking distance. Braking distance refers to the distance a vehicle will travel from the point when its brakes are fully applied to when it comes to a complete stop. It is primarily affected by the original speed of the vehicle and the coefficient of friction between the tires and the road surface, [Note 1] and negligibly by the tires' rolling ...

  9. Plus sizing - Wikipedia

    en.wikipedia.org/wiki/Plus_sizing

    Plus sizing is the practice of replacing an automotive wheel with one of a larger diameter fitted with a new tire of lower aspect ratio so that the new tire has close to the same diameter and circumference as the original tire to minimize any changes in speedometer accuracy, torque and traction control, while reducing sidewall flex and (generally) increasing cornering ability.

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