2026 Specialized Aethos 2 Expert Shimano Ultegra Di2

With a 705g frame, the Aethos 2 is the lightest bike in its class. But weight was never the point. Built by breaking racing’s rules to deliver pure road riding bliss, it’s engineered to disappear beneath you: responsive, supple, and sublime. Now with increased tire clearance, refined components, and data-based fit-enhancing geometry, it brings that transcendent ride feel to more riders than ever. Aethos 2 breaks the rules, for the love of the ride.

Frameset

• Frame: Aethos 2 FACT 10r Carbon, Rider First Engineered™, Threaded BB, Hidden Cable Routing, 12x142mm thru-axle, flat-mount disc

Suspension

• Fork: Aethos 2 FACT 10r Carbon, 12x100mm thru-axle, flat-mount disc

Brakes

• Front Brake: Shimano Ultegra BR-R8170 Hydraulic Brake
  
• Rear Brake: Shimano Ultegra BR-R8170 Hydraulic Brake

Drivetrain

• Bottom Bracket: Shimano Threaded BSA BB
  
• Rear Derailleur: Shimano Ultegra Di2 R8150, 12-speed
  
• Front Derailleur: Shimano Ultegra Di2 R8150, braze-on
  
• Shift Levers: Shimano Ultegra Di2 R8170, hydraulic disc
  
• Crankset: Shimano Ultegra R8100, 52/36t
  
• Cassette: Shimano Ultegra, 12-speed, 11-30t
  
• Chain: Shimano XT M8100, 12-speed w/ quick link

Wheels & tires

• Inner Tubes: 700x20-28, 48mm Presta Valve
  
• Front Wheel: Roval C38, 21mm internal width carbon rim
  
• Rear Wheel: Roval C38, 21mm internal width carbon rim
  
• Front Tire: S-Works Turbo, 700x28
  
• Rear Tire: S-Works Turbo, 700x28

Cockpit

• Saddle: Body Geometry Power Expert
  
• Handlebars: Roval Alpinist Carbon Handlebar, 125mm drop, 75mm reach
  
• SeatPost: Roval Alpinist Carbon Seatpost
  
• Seat Binder: Specialized Alloy, 30mm
  
• Stem: Specialized Pro SL, alloy, 4-bolt
  
• Tape: Supacaz Super Sticky Kush

Weight

• Weight Size: 56
  
• Weight: 7.12 kg (15 lb, 11.2 oz), tubeless