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Definition

Castor-- looking at the side of the vehicle, castor is the angle of the pivot point on which the wheel is turned for steering. The castor angle is determined by the line through the upper and lower ball joints. A positive castor is one in which the line tilts towards the rear of the car. A positive castor helps provide self-center of the steering when the wheel is released. The greater the positive castor, the more tire feel is provided to the driver, however, it also creates more scrub and drag. Therefore the adjusment is a compromise. The more experienced the driver, the less the castor can be. Castor should be identical for both wheels, but is often not adjustable on street cars, and is affected by lowering the car and changing the camber. This can result in a pull to the left or right which cannot be corrected without reducing the camber and/or lowering amount closer to stock settings.

Glossary of Terms

Below is a list of automotive and road racing terms. Click on any of the letters to go to the start of that section, click on the term to open a window with the definition.

Terms J - R

J K L M N O P Q R

J

terms coming soon

K

terms coming soon

L

loose (handling)

M

terms coming soon

N

terms coming soon

O

oversteer

P

psi and psig
push (handling)

Q

terms coming soon

R

reference points

Terms S - Z

S T U V W X Y Z

S

terms coming soon

T

tactile feedback
tight (handling)
trail braking
toe
turn-in point

U

understeer

V

terms coming soon

W

terms coming soon

X

terms coming soon

Y

terms coming soon

Z

terms coming soon

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