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  2. Speedometer - Wikipedia

    en.wikipedia.org/wiki/Speedometer

    Nearly all tires now have their size is shown as "T/A_W" on the side of the tire (See: Tire code), and the tires. Diameter in millimetres = 2 × T × A / 100 + W × 25.4 {\displaystyle {\mbox{Diameter in millimetres}}=2\times T\times A/100+W\times 25.4} Diameter in inches = T × A / 1270 + W {\displaystyle {\mbox{Diameter in inches}}=T\times A ...

  3. Wheel speed sensor - Wikipedia

    en.wikipedia.org/wiki/Wheel_speed_sensor

    Depending on the diameter and teeth of the wheel it is possible to get between 60 and 300 pulses per revolution, which is sufficient for drives of lower and medium traction performance. This type of sensor normally consists of two hall effect sensors , a rare-earth magnet and appropriate evaluation electronics.

  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. 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.

  6. Odometer - Wikipedia

    en.wikipedia.org/wiki/Odometer

    An electronic odometer (below speedometer) with digital display showing 91,308 miles (146,946 km) from a Jeep Grand Cherokee (WJ) An odometer or odograph is an instrument used for measuring the distance traveled by a vehicle, such as a bicycle or car. The device may be electronic, mechanical, or a combination of the two (electromechanical).

  7. ISO 5775 - Wikipedia

    en.wikipedia.org/wiki/ISO_5775

    The overall diameter of the tire is then the rim diameter plus twice the tire's section height. The ISO 5775-1 standard also defines procedures for measuring tires and for calculating from the marking the maximum dimensions of a tire, which are needed by designers to determine clearance distances to other bicycle components.