In order to measure your anti geometry, the side view swing arm for your front and rear suspension systems must first be established. This opposing force comes in the form of anti-geometry. In order to prevent this rotation from happening or to limit the amount of rotation an opposing force needs to be applied to the centre of gravity. The diagrams below show the direction of rotation about the centre of gravity for braking and accelerating conditions. When braking, due to linear inertia changes, the car will rotate forwards around the centre of gravity, therefore lifting behind the centre of gravity towards the rear and lowering the car in the area in front of the centre of gravity. The centre of gravity is therefore the centre of rotation for any acceleration or braking inputs. All forces acting upon a car act through the centre of gravity. What anti-geometry does achieve is the amount of load going through the springs and the pitch attitude of the car.īefore describing what each in particular anti-geometry is an understanding of how a car moves and rotates under acceleration or braking conditions must be achieved. In reality the wheel loading remains the same regardless of anti-geometry as the total longitudinal load transfer under steady state acceleration or braking is a function of the wheel base, braking or acceleration force and centre of gravity height. A common misconception is that anti-geometry controls or affects wheel loading where more squat on accelerating will give more rear wheel loading. Suspension Secrets Porsche GT Circuit Handling Pack DevelopmentĪnti-squat, anti-dive and anti-lift geometry which will be referred to as “anti-geometry” when discussing them as a whole is a form of geometry at the front and rear wheels that alters and controls the amount that a car will compress the springs due to acceleration, deceleration or braking conditions.Suspension Secrets M3ATER Build – Part 2.Suspension Secrets M3ATER Build – Part 1.Porsche 930 Flatnose – Improving an Icon.Dallara World Series Single Seater – Under The Skin.Budget to Premium Coilovers – Whats The Real Difference?. ![]() 2022 Porsche Cayman GT4 RS Suspension Overview.Calculating Ideal Spring and Roll Bar Rates Part 2.Calculating Ideal Spring and Roll Bar Rates.Tyre Performance and Grip – A Deeper Look.Tyre Failure – Graining, Tearing, Blistering and Wearing.Coilovers – Correct Ride Height Setting.The fundamental categories of suspension geometry are: Ackermann Bump Steer Camber Camber Gain Caster Front View Swing Arm Fundamentals of Grip Instantaneous Centre King Pin Inclination Scrub Radius Toe Tyre Slip Angle There are more aspects to suspension geometry but the most influential are listed above and are the focus of this website. Geometry Suspension geometry is a mixture of theoretical lines designed into a suspension system to make it work in a particular designed way.
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