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2. Quick release skewer - Wikipedia

   en.wikipedia.org/wiki/Quick_release_skewer

   The rod is inserted into the hollow axle of the wheel, a special nut is threaded on, and the lever is closed to tighten the cam and secure the wheel to the fork. Wheels equipped with quick release mechanisms can be removed from the bicycle frame and replaced without using tools by opening and closing the cam lever, thus more quickly than wheels ...

3. Wheelchair - Wikipedia

   en.wikipedia.org/wiki/Wheelchair

   Wheels are rubber-tired and may be solid, pneumatic or gel-filled. The wheels of folding chairs may be permanently attached, but those for rigid chairs are commonly fitted with quick-release axles activated by depressing a button at the centre of the wheel. All major varieties of wheelchairs can be highly customized for the user's needs.

4. Bicycle wheel - Wikipedia

   en.wikipedia.org/wiki/Bicycle_wheel

   Diameters for front thru axles include 20 mm, 15 mm, 12 mm, and 9 mm. Rear axles typically have diameters of 10 or 12 mm. Most thru axles are found on mountain bikes, although increasingly disc-braked cyclocross and road bikes are using them. Thru axles repeatably locate the wheel in the fork or frame, which is important to prevent misalignment ...

5. Mecanum wheel - Wikipedia

   en.wikipedia.org/wiki/Mecanum_wheel

   A Mecanum wheel is an omnidirectional wheel design for a land-based vehicle to move in any direction. It is sometimes called the Swedish wheel or Ilon wheel after its inventor, Bengt Erland Ilon (1923–2008), [ 1 ] who conceived of the concept while working as an engineer with the Swedish company Mecanum AB, and patented it in the United ...

6. Motorized wheelchair - Wikipedia

   en.wikipedia.org/wiki/Motorized_wheelchair

   A motorized wheelchair, powerchair, electric wheelchair, or electric-powered wheelchair (EPW) is a wheelchair that is propelled by means of an electric motor (usually using differential steering) rather than manual power. Motorized wheelchairs are useful for those unable to propel a manual wheelchair or who may need to use a wheelchair for ...

7. Wheel and axle - Wikipedia

   en.wikipedia.org/wiki/Wheel_and_axle

   The wheel and axle is a simple machine, consisting of a wheel attached to a smaller axle so that these two parts rotate together, in which a force is transferred from one to the other. The wheel and axle can be viewed as a version of the Lever, with a drive force applied tangentially to the perimeter of the wheel, and a load force applied to ...