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  2. Caster - Wikipedia

    en.wikipedia.org/wiki/Caster

    A caster is a wheel mounted to a fork, with an optional, additional offset steering joint. An omnidirectional wheel (Mecanum wheel, Omni wheel, or Swedish wheel) is made of a large central hub with many additional smaller wheels mounted along the perimeter such that their axes are perpendicular to the central wheel. The central wheel can rotate ...

  3. 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.

  4. Chair - Wikipedia

    en.wikipedia.org/wiki/Chair

    Chair, c. 1772, mahogany, covered in modern red morocco leather, height: 97.2 cm, Metropolitan Museum of Art (New York City) A chair is a type of seat, typically designed for one person and consisting of one or more legs, a flat or slightly angled seat and a back-rest.

  5. Rail fastening system - Wikipedia

    en.wikipedia.org/wiki/Rail_fastening_system

    Rusted chair screw Chair screw (French: Tire-fonds) A chair screw (also known as coach screw [16]) is a large (~6 in or 152 mm length, slightly under 1 in or 25 mm diameter) metal screw used to fix a chair (for bullhead rail), baseplate (for flat bottom rail) or to directly fasten a rail. Chair screws are screwed into a hole bored in the ...

  6. Bicycle wheel - Wikipedia

    en.wikipedia.org/wiki/Bicycle_wheel

    "29-inch wheels", which also conform to the popular 700C (622 mm diameter clincher) wheel standard are becoming more popular for not only cyclocross bikes but also cross-country mountain bikes. Their rim diameter of 622 millimetres ( 24 + 1 ⁄ 2 in) is identical to most road, hybrid, and touring bicycle wheels, but they are typically ...

  7. Wheelchair - Wikipedia

    en.wikipedia.org/wiki/Wheelchair

    A man with a disability sitting in a wheelchair. A wheelchair is a mobilized form of chair using 2 or more wheels, a footrest, and an armrest usually cushioned. It is used when walking is difficult or impossible to do due to illnesses, injury, disabilities, or age-related health conditions.