When the front suspension of a vehicle is aligned, caster is adjusted to achieve a self-centering action in the steering, which affects the vehicle's straight-line stability. -AndrewDressel 03:08, 12 June 2009 (UTC) Doesn't help that there is a picture of a motorbike on the caster angle page but no mention of rake and trail. ... Caster - This refers to the angle of the steering axis in relation to tan imaginary vertical line through the center of the wheel when viewed from the side. A negative camber angle will result in tire wear on the inside of the tire. The camber angle is measured in degrees. The steering axis is a line drawn through the upper and lower ball joints of the knuckle. https://www.freeasestudyguides.com/steering-caster-chart.html Turning the wheel lifts the front end a little, and releasing the wheel allows the weight of the vehicle to push back down, assisting return to center. The effects of a positive caster. If the pivot axis is tilted backward (that is, the top pivot is positioned farther rearward than the bottom pivot), then the caster is positive; if it's tilted forward, then the caster is negative. The rear suspension on some cars also has a caster. … Why Is My Steering Wheel Shaking? They point forward at the bottom and slope back at the top, causing the tire to remain stable. [5], Angular displacement of the steering axis from the vertical axis of a steered wheel in a car, motorcycle, bicycle or other vehicle, measured in the longitudinal direction / the angle between the pivot line and vertical, http://www.bikeforest.com/CAD/caster_angle.php, https://en.wikipedia.org/w/index.php?title=Caster_angle&oldid=999586611, Articles with unsourced statements from July 2020, Creative Commons Attribution-ShareAlike License, This page was last edited on 10 January 2021, at 23:21. Caster is adjustable in independent suspension design. Caster refers to how far forward or backwards the wheels of a car are in relation to their steering pivot angle. It causes the wheels to wheels to lead or follow in the same direction as the vehicle. Tan (θ) = (AD-BC)/AB. Positive Caster vs Negative Caster. All alignment angles are directional control angles, which means they affect steering and vehicle control. Caster displacement moves the steering axis ahead of the axis of wheel rotation, as with the front wheels of a shopping cart. 1. Troubleshooting Problems With … A good starting point for this is 30 mm behind the center of the contact patch. A positive vehicle caster angle works similarly to a caster wheel on a cart. Caster Caster is the tilt of the steering axis of each front wheel as viewed from the side of the vehicle. To read CASTER first turn the wheels 20º to the right when setting the RF and to the left when setting LF. Vehicles with SLA suspensions use the upper and lower ball joints to create the angle, and those with struts use the center of the upper strut mount and the lower ball joint as the angle. Camber angle is one of the angles made by the wheels of a vehicle; specifically, it is the angle between the vertical axis of a wheel and the vertical axis of the vehicle when viewed from the front or rear. Suspension design & drive (front-wheel-drive or rear-wheel-drive) are the main factors which decide whether the caster should be positive or negative. It’s the pivot angle of the front wheels measured from vertical, when viewed from the side. This is because the steering axis is now inclined, rather than vertical, due to the caster. (See the diagram below). We've experimented in the past with digital angle finders, which work very well but require math to calculate caster angle. It varies for different types of motorcycles. How does camber work? After making sure all joints are within tolerances, a computerized four-wheel alignment will keep all your angles within specification, caster, camber, toe, and more. Additionally, you could cut them on an angle (~30deg) to make self aligning casters too. The easiest way to envision what camber looks like is to view the wheel and tire head on. First, Rake (also called Caster) is the angle of a motorcycle’s steering head of frame. Caster is the fore or aft slope of the steering axis. Rake and trail are bike specific. The pivot line of the wheel contacts the floor, in front of the wheel’s centerline. The ASTC or CAST or unit circle method for finding two angles having a given sine, cosine or tangent In this method you draw a set of axes and label the quadrants 1, 2, 3 and 4 with the letters A, S, T and C respectively as shown in the diagrams below. Different right side and left side caster to spot on a few vehicles, to lower steering effort steering angle! 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