Built by breaking racing's rules to deliver pure road riding bliss, the Aethos 2 is engineered to disappear beneath you. Aethos 2 breaks the rules for the love of the ride. So Light, It's a Crime Aethos began with a moment of human insight: frames "breath" under load. That subtle rhythm revealed how force moved. We fed this into our supercomputer, evolving tubes into sculpted forms. Shape itself delivered stiffness. The result wasn't just the lightest road bike in its class and a more perfect ride, it was a new way of making bikes - Flow State Design. Flow State Design Where Specialized Science Club Meets Machine Intelligence 705 grams FACT 10r Frames The lightest road frame in its class and our most optimized layup ever. We'll Never Make a Bike the Same Way Aethos redefined how we build bikes. Crux and Tarmac SL8 followed its lead. Rider First Engineered Regardless of the bike's size, every rider gets the famed Aethos ride quality. Geometry and Fit Perfected for More Riders We refined the fit and geometry using data from over 100,000 Body Geometry fits to make long days in the mountains feel even better. Climb faster. Descend harder. Ride longer. You get precise handling in a more versatile and confidence-inspiring package. New Fit for More Comfort and Performance We increased the stack by 15mm to help take pressure off your hands, neck and shoulders. More Confidence, More Stability What goes up, must come down. A 7mm longer wheelbase for confidence to push the pace on descents. Carve the Corners with Precision A 0.5deg Slacker Headtube creates nimble but intuitive handling. Aethos 2 must be reading your mind. Ride 'in' the bike, not 'on' the bike. With a 3mm lower BB height is optimized for higher volume road tires and a more connected feeling to the bike and road. More Versatility. More Clearance. No Compromise. Aethos 2 clears 35 mm tires with ease. That means smoother, faster rides, more grip, and more roads. That kind of upgrade usually comes at a cost. Not here. We didn't just create our most optimized layup ever, we re-engineered every detail. No gram was safe from the Specialized Science Club's obsession. Saddle Rail Clamp 9 Grams Saved Bottom Bracket Shell 6 Grams Saved Brake Mounts 2 Grams Saved Lightweight UDH 2 Grams Saved The Fastest Way to the Top The Alpinist bar and stem and Roval C38 wheels are purpose-built to elevate Aethos 2, while delivering significant weight savings. Roval C38 Wheels Roval C38 wheels brings carbon fiber high performance to the real world. It's a versatile all-rounder equally at home crushing rough miles and summiting alpine passes. Alpinist Handlebars Alpinist bars are 15% lighter than our S-Works Short & Shallow bar-built for big climbs, city-limit sprints, and riders who demand timeless style with cutting-edge performance.