Generated using the following Eukleides script, followed by judicious tweaking in en:Inkscape and manually editing the XML.

box(-2, -2, 10, 10)
cc = point(4,4)
Ci = circle(cc, 3)
Co = circle(cc, 4)
base = line(point(0,0), point(2,0))
vert = segment(point(4, 0), point(4,40))
ang = line(cc, 60:)
draw(Co)
draw(Ci)
mark(point(Ci, 60:), cc, point(4,6), backarrow, 3)
color(lightgray)
draw(base)
draw(vert)
mark(point(0,0), point(4,0), cc, right)
color(red)
draw(ang, dashed)
draw(segment(point(ang, -2), point(ang, 2)))
color(black)
draw(cc)

draw(point(ang, 2), box)
draw(point(ang, -2), box)
draw(point(vert, 2), cross)
draw(point(vert, 6), cross)

此作品已由其作者，英文維基百科的Ktims，釋出至公有領域。此授權條款在全世界均適用。 這可能在某些國家不合法，如果是的話： Ktims授予任何人有權利使用此作品於任何用途，除受法律約束外，不受任何限制。Public domainPublic domainfalsefalse

• 2006-03-14 15:35 Ktims 600×600×0 (12061 bytes) Diagram indicating caster angle. The solid red segment indicates the steering axle, with the dashed red line indicating the pivot line. The gray shaded section would be the vehicle's tire.