Spire Sports Cars, based in Derbyshire, UK, specializes in lightweight, motorcycle-engined sports prototypes designed for competitive club-level racing. Their flagship model, the GT-3, features a tubular steel spaceframe chassis with fiberglass and carbon fiber bodywork, optimized for aerodynamic efficiency and structural rigidity. The GT-3 is engineered to accommodate high-revving motorcycle engines, such as the Honda CBR1000RR and Suzuki…