The 2025 Specialized Aethos Pro Shimano Ultegra Di2 is a featherweight road bike designed to blend top-tier performance with everyday rideability. Built around Specialized’s FACT 10r carbon frame, it delivers an exceptional balance of stiffness, low weight, and responsive handling, making it equally capable on steep climbs and fast descents. Shimano’s 12-speed Ultegra Di2 drivetrain provides smooth, precise electronic shifting, paired with hydraulic disc brakes for confident stopping power. Rolling on Roval Alpinist CL II carbon wheels, the Aethos Pro offers a lively, refined ride that’s as efficient as it is comfortable—perfect for riders chasing speed without sacrificing style or versatility.