A summary of the handling effects of tyre and suspension changes.

(Remember that to explore any changes, a private facility is required)

Adjustment		To decrease understeer	To decrease oversteer
Tyre pressure	Front pressures Rear pressures	Increase Decrease	Decrease Increase
Tyre width	Front width Rear width	Increase Decrease	Decrease Increase
Wheel width	Front width Rear width	Wider Narrower	Narrower Wider
Alignment (“tracking”)	Front camber Front castor Front toe-in Rear camber Rear toe-in	More negative More positive Towards toe-out More positive Towards toe-out	More positive More negative Mores toe-in More negative More toe-in
Antti-roll bars	Front Rear	Soften Stiffen	Stiffen soften
Spring rates	Front Rear	Soften Stiffen	Stiffen soften
Weight distribution	Front Rear	Decrease Increase	Increase Decrease

(never reduce below recommended tyre pressures – and increase in steps of 2psi)