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GLOSSARY

ACKERMANN
Steering geometry used to ensure that the front inner wheel turns about a smaller radius than the front outer wheel, minimising tyre scrub that would occur if both the wheels turned equally.

BUMP STEER
Changes in toe as the front wheels articulate through bump (wheel moves up) and rebound (wheel moves down).

CAMBER
Inclination of the tyre towards the car's longitudinal axis relative to the vertical plane.

CASTOR
Longitudinal distance between the centre of the tyre contact patch & the intersection of the line running through the centre of the kingpin.

CENTRE OF PRESSURE
The point at which the aerodynamic lift/downforce appears to act. It is typically quoted as a percentage of the wheelbase. A centre of pressure of 100% means that all of the aerodynamic force can be considered to act on the front axle.

CENTRE OF GRAVITY
The point at which the sum of component masses appears to act. It is typically quoted as a percentage of the wheelbase. A centre of gravity of 100% means that all of the vehicle masses can be considered to act on the front axle.

DIVE
Transfer of car's weight onto front wheels during braking/deceleration.

DRAG
The component of aerodynamic force which opposes motion.

DOWNFORCE
The component of aerodynamic force which acts in a vertically downward direction thus increasing a tyres ability to grip the road.

PITCH
Vertical movement around the car's transverse axis during acceleration & braking.

PRIMARY RIDE
Ability to control large body movement, pitch, roll, etc.

TOE
Angle between the car's longitudinal axis & a plane through the centre of the Tyre.

ROLL CENTRE
Point around which the vehicle body will roll transversely at either the front or rear.

SCRUB RADIUS
Lateral distance between the centre of the tyre contact patch & the intersection of the line running through the centre of the kingpin.

SECONDARY RIDE
Ability to filter out & absorb smaller irregularities in the road surface.