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  2. 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.

  3. 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.

  4. 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.

  5. Slip ratio - Wikipedia

    en.wikipedia.org/wiki/Slip_ratio

    Slip ratio is a means of calculating and expressing the slipping behavior of the wheel of an automobile.It is of fundamental importance in the field of vehicle dynamics, as it allows to understand the relationship between the deformation of the tire and the longitudinal forces (i.e. the forces responsible for forward acceleration and braking) acting upon it.

  6. Aspect ratio - Wikipedia

    en.wikipedia.org/wiki/Aspect_ratio

    The aspect ratio of a geometric shape is the ratio of its sizes in different dimensions. For example, the aspect ratio of a rectangle is the ratio of its longer side to its shorter side—the ratio of width to height, [1][2] when the rectangle is oriented as a "landscape". The aspect ratio is most often expressed as two integer numbers ...

  7. 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 ...

  8. Aquaplaning - Wikipedia

    en.wikipedia.org/wiki/Aquaplaning

    Tire tread aspect ratio: The longer and thinner the contact patch, the less likely a tire will aquaplane. tires that present the greatest risk are small in diameter and wide. [citation needed] Vehicle weight: More weight on a properly inflated tire lengthens the contact patch, improving its aspect ratio. Weight can have the opposite effect if ...

  9. Formula One tyres - Wikipedia

    en.wikipedia.org/wiki/Formula_One_tyres

    Formula One. The 2023 Pirelli tyres include (from left to right) the three slicks – called the softs, mediums, and hards – intermediates, and full wets. Formula One tyres are specialised racing tyres designed for use on a Formula One car. Tyres play a crucial role in the car's performance, affecting grip, handling, and overall speed.

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