2026 Specialized Aethos 2 Pro 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 disc
  
• Rear Brake: Shimano Ultegra BR-R8170, hydraulic disc

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 with 4iiii Precision 3+ single-sided Power Meter, 52/36t
  
• Cassette: Shimano Ultegra, 12-speed, 11-30t
  
• Chain: Shimano XT M8100, 12-speed w/ quick link

Wheels & tires

• Inner Tubes: 700x25-35, 50mm Presta Valve, TPU
  
• Front Tire: S-Works Turbo TLR Race Tire, 700x28c
  
• Rear Tire: S-Works Turbo TLR Race Tire, 700x28c
  
• Front Wheel: Roval Alpinist CL II, 21mm internal width carbon rim, 33mm depth, Win Tunnel Engineered, DT for Roval 350 hub, DT Swiss Aerolite spokes, Tubeless Ready
  
• Rear Wheel: Roval Alpinist CL II, 21mm internal width carbon rim, 33mm depth, Win Tunnel Engineered, DT for Roval 350 hub, DT Swiss Aerolite spokes, Tubeless Ready

Cockpit

• Handlebars: Roval Alpinist Cockpit II, Integrated Bar/Stem
  
• Saddle: Power Pro Mirror, Hollow Ti rails
  
• SeatPost: Roval Alpinist Carbon Seatpost
  
• Seat Binder: Specialized Alloy, 30mm
  
• Tape: Supacaz Super Sticky Kush

Weight

• Weight Size: 56
  
• Weight: 6.73 kg (14 lb, 13.4 oz), tubeless