Suspension geometry has a major effect on how a vehicle turns, brakes, accelerates, and responds to changes in road surface. It determines how the wheels move relative to the body and how well the tires maintain contact with the road.
Key factors include:
- Camber: Controls how the tire sits against the road during cornering. Appropriate negative camber can keep more of the tire’s contact patch on the road when the car rolls.
- Caster: Influences steering stability, self-centering, and steering feel. More positive caster generally improves straight-line stability and can increase steering effort.
- Toe: Affects how the tires point relative to each other. Incorrect toe can make the car unstable, increase tire wear, and reduce precise turn-in.
- Roll center: Influences how the suspension reacts to cornering forces and how much the body rolls.
- Anti-dive and anti-squat: Control how much the suspension compresses or extends during braking and acceleration, affecting vehicle balance.
Good suspension geometry keeps the tires working effectively as the suspension moves. Poor geometry can cause unpredictable handling, uneven tire wear, and reduced grip even when the tires themselves are good.
In practical terms, suspension geometry is what connects the tire to the vehicle's handling behavior. Small changes in alignment or suspension components can noticeably change steering response, stability, and cornering performance.
