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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 supported object. While rotating around the vertical shaft, swivel caster wheels sweep out a space.
The steering axis is the axis about which the steering mechanism (fork, handlebars, front wheel, etc.) pivots. In bicycles, the steering axis angle is called the head angle and is measured clock-wise from the horizontal when viewed from the right side. A 90° head angle would be vertical. Some examples of caster angles are: [5]
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 ...
A motorcycle fork connects a motorcycle's front wheel and axle to its frame, typically via a yoke, also known as a triple clamp, which consists of an upper yoke joined to a lower yoke via a steering stem, a shaft that runs through the steering head, creating the steering axis.
Caster displacement moves the steering axis ahead of the axis of wheel rotation, as with the front wheels of a shopping cart. Caster angle moves the steering axis from vertical. [3] In automobile racing, the caster angle may be adjusted to optimize handling characteristics for a particular venue. This is all connected to the front wheels.
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 ...
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