Caster refers to the angle of a steering axis in relation to a vertical axis. This angle is measured in degrees. A caster can be adjusted for different handling characteristics in a particular venue. The caster can be positive, negative, or zero/neutral.
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Zero/neutral caster is when the steering axis is directly south of the upper ball joint and the center of the wheel is directly south of the strut mount. This setting produces a perfect vertical shock. Read more : https://www.castercity.com/
Positive caster is when the line of the steering axis slopes towards the rear of the vehicle. It promotes self-centering of the steering wheel and improves straight-line stability at speed. In addition, it promotes good steering effort and returns the wheel to its upright position when the steering is turned.
Negative caster is when the line of the steering is angled towards the front of the vehicle. It can be dangerous. Having a negative caster can result in drifting and a sloppy steering wheel. If the steering is asymmetrical, it can cause increased wear on suspension components.
Caster flutter is a major disadvantage of casters. This is similar to speed wobble in other wheeled vehicles. However, it occurs naturally at certain speeds. There are some ways to avoid it, such as trailing distance. Depending on the caster, a trail can be shortened to eliminate the flutter at moderate speeds.
The caster is an important part of the rear suspension system. Proper caster selection is essential to safe handling. When choosing a caster, consider the application, load rating, and floor conditions.