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2. Caster - Wikipedia

   en.wikipedia.org/wiki/Caster

   Large diameter caster wheels are able to bridge gaps like that between the floor and an elevator car. However, the larger the diameter of a caster wheel, the higher the caster support arm must be. Either the base of a low-hanging object must be lifted higher above the wheels, or the casters must hang out to the sides straddling the low-hanging ...

3. Wheel stud - Wikipedia

   en.wikipedia.org/wiki/Wheel_stud

   Wheel studs are the threaded fasteners that hold on the wheels of many automobiles. They are semi-permanently mounted directly to the vehicle hub, usually through the brake drum or brake disk. Lug nuts are fastened onto the wheel stud to secure the wheel. When a wheel is removed for tire changes etc., the stud remains in the hub.

4. Stem (bicycle part) - Wikipedia

   en.wikipedia.org/wiki/Stem_(bicycle_part)

   Quill stem classic single-piece type Threadless stem shown with cable hole. The stem is the component on a bicycle that connects the handlebars to the steerer tube of the bicycle fork. Sometimes called a goose neck, [1] a stem's design belongs to either a quill or threadless system, and each system is compatible with respective headset and fork ...

5. Caster angle - Wikipedia

   en.wikipedia.org/wiki/Caster_angle

   The purpose of this is to provide a degree of self-centering for the steering—the wheel casters around in order to trail behind the axis of steering. This makes a vehicle easier to control and improves its directional stability (reducing its tendency to wander). Excessive caster angle will make the steering heavier and less responsive ...

6. Continuous track - Wikipedia

   en.wikipedia.org/wiki/Continuous_track

   Continuous tracks on a bulldozer A dump truck with continuous track wheels crosses a river and dumps its load in Kanagawa, Japan. An agricultural tractor with rubber tracks, mitigating soil compaction A Russian tracked vehicle designed to operate on snow and swamps A British Army Challenger 1 tank

7. Headset (bicycle part) - Wikipedia

   en.wikipedia.org/wiki/Headset_(bicycle_part)

   A threadless headset and fork is marginally lighter than an equivalent threaded headset and fork. A threadless stem is more rigidly attached to the forks, giving improved rigidity at the handlebars. On bicycles which have not been maintained, water can find its way between the stem and steerer tube of threaded headsets, causing corrosion and ...