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Suspension geometry features that resist pitch changes during acceleration (anti-squat) and braking (anti-dive). Expressed as a percentage, 100% anti-squat means the rear suspension completely resists compression under acceleration.
Haney's The Racing and High-Performance Tire provides the calculation: "Percent anti-squat = 100 x (SVSA height / SVSA length) x (wb / h)" where SVSA is the side-view swing arm geometry, wb is the wheelbase, and h is the CG height. Staniforth's Car Suspension explains the concept: "Anti-dive and anti-lift geometry is used to control pitch movements on the front and rear axle by angling the control arms to intersect and create an 'anti' effect. Without some form of anti geometry the vehicle will lift on the front end and squat on the back end under acceleration, and vice versa under braking. Most vehicles will therefore use a percentage of lift and dive geometry." Gillespie's Fundamentals of Vehicle Dynamics adds the foundational mechanics: "the load on the rear wheels increases due to longitudinal weight transfer" and the suspension geometry determines how much of that transfer passes through the springs versus the links.