Swave & Summit | Roll Center Adjuster Plates | Toyota GR Yaris | G16E-GTS | 2021+Roll center adjusters are components used in the suspension systems of vehicles, particularly in performance and racing applications. Heres a breakdown of their function and importance: What is Roll Center? The roll center is an imaginary point around which a vehicle's body rolls during cornering. It is determined by the geometry of the suspension system. The position of the roll center relative to the center of gravity affects how a vehicle handles,