SR5
The Radical SR5, manufactured by British specialist constructor Radical Sportscars as purpose-built sports racing prototype for international competition and track day use, features motorcycle-derived powertrain utilizing Honda K20 VTEC or Ford Duratec 2.0-liter four-cylinder engines producing between 237-300 horsepower depending on specification with peak output achieved at 7,700-8,500 rpm, paired with Hewland six-speed sequential transaxle with Powertec oil pump and cooler driving rear wheels through extreme lightweight construction achieving approximately 550 kg curb weight. Extraordinary power-to-weight ratio exceeding 545 horsepower per ton in highest specification enables devastating 3.1-second 0-60 mph acceleration and approximately 250 km/h (155 mph) top speed from minimalist open-cockpit design emphasizing maximum performance through minimum weight following Colin Chapman philosophy adapted by Radical founder Mick Hyde.
The SR5 represents Radical mid-range offering positioned between entry-level SR3 and flagship SR8 competing in international hillclimb championships, endurance racing including Britcar series, and providing ultimate track day experience for serious driving enthusiasts. Advanced engineering features tubular steel space-frame chassis with fiberglass and carbon composite bodywork creating inherent aerodynamic downforce, fully adjustable double-wishbone suspension with competition dampers, ventilated disc brakes with multi-piston calipers, and dry-sump lubrication system ensuring consistent oil pressure during sustained high-G cornering forces. Available with Honda K20 VTEC configuration producing approximately 300 horsepower through high-revving naturally-aspirated architecture or Ford Duratec alternative offering broader torque delivery, the SR5 delivers professional racing car performance at accessible price point versus purpose-built prototypes. Popular among track day enthusiasts and amateur racers seeking genuine competition capability, the SR5 combines incredible acceleration rivaling modern supercars, direct steering feedback and chassis communication unmatched by road-legal sports cars, and comprehensive Radical factory support network providing technical assistance and parts availability establishing British sports prototype manufacturer reputation for driver-focused performance machines delivering pure driving experience without electronic intervention or comfort compromises.