The Specialized Aethos 2 Ultegra Di2 represents the lightest production road frame in its class, engineered not merely for minimal weight but to deliver pure road riding bliss. With a 705-gram FACT 10r frame, this bike is built to disappear beneath riders through responsive handling, supple compliance, and sublime ride quality. Enhanced with increased tire clearance and data-based fit geometry refined from over 100,000 Body Geometry fits, the Aethos 2 brings transcendent ride feel to more cyclists than ever before. The revolutionary Flow State Design philosophy originated from engineers observing how frames "breathe" under load, a subtle rhythmic pattern that reveals force movement through the structure. This insight fed into Specialized&';s supercomputer alongside decades of mechanical testing data, evolving traditional round tubes into precisely sculpted forms optimized for energy flow. By refining shape rather than adding material layers, the design eliminates traditional carbon stiffness layers while improving ride quality and structural integrity. The refined geometry increases the stack by 15mm to reduce pressure on hands, neck, and shoulders during extended rides, while a 7mm longer wheelbase enhances descending confidence. A 0.5Adeg slacker headtube angle creates nimble yet intuitive handling that responds precisely to rider input. Despite accommodating 35mm tires for improved comfort, grip, and versatility, the Aethos 2 maintains its class-leading weight through meticulous optimization of every component. Built for riders who value pure road riding experience, this model pairs the sublime frame with Shimano&';s Ultegra Di2 R8170 12-speed electronic shifting for precise, reliable performance. Roval C38 wheels with S-Works Turbo tires complete the package, delivering aerodynamic efficiency and confident grip across varied conditions. Key Features Frame: FACT 10r Carbon with Flow State Design (705g) Drivetrain: Shimano Ultegra Di2 R8170 12-Speed Electronic Wheelset: Roval C38 with S-Works Turbo Tires