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  2. Wheel sizing - Wikipedia

    en.wikipedia.org/wiki/Wheel_sizing

    Wheels with Asanti 28 in (710 mm) rims on a police Hummer H2 car. 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.

  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. [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.

  4. Contact patch - Wikipedia

    en.wikipedia.org/wiki/Contact_patch

    Colorized tire footprint pressure distribution. The contact patch is the portion of a vehicle's tire that is in actual contact with the road surface.It is commonly used in the discussion of pneumatic (i.e. pressurized) tires, where the term is used strictly to describe the portion of the tire's tread that touches the road surface.

  5. 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.

  6. Ground pressure - Wikipedia

    en.wikipedia.org/wiki/Ground_pressure

    Increasing the size of the contact area on the ground (the footprint) in relation to the weight decreases the unit ground pressure. Ground pressure of 14 kPa (2 psi) or less is recommended for fragile ecosystems like marshes. [ 4 ]

  7. Rolling resistance - Wikipedia

    en.wikipedia.org/wiki/Rolling_resistance

    EU passenger car tyre label fuel efficiency class A (upper limit) 0.0062 to 0.0150 [31] Car tire measurements 0.0100 to 0.0150 [32] Ordinary car tires on concrete 0.0385 to 0.0730 [33] Stage coach (19th century) on dirt road. Soft snow on road for worst case. 0.3000 [32] Ordinary car tires on sand

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