S-Works Aethos Frameset - FACT 12r CarbonS Works Aethos Frameset is the lightest road frameset Specialized has ever made under 600 g for a size 56. FACT 12r carbon, traditional round tube aesthetic, no aero compromises, no electronic only routing demands. Built for riders who want the climbing weapon and don't care about marginal aero gains. Key Features S Works Aethos FACT 12r Carbon frame sub 600 g size 56 frame weight Traditional round tube design pure climbing aesthetic, classic feel