2026 Aethos 2 Pro - Shimano Ultegra Di2

Specialized Aethos 2 – Break the Rules

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.

At a Glance

Use: Performance Road Riding
Frameset: 705g FACT 10r Frame / FACT 10r Fork
Fit: Performance Endurance
Cockpit & Wheels: Roval Alpinist Integrated Cockpit II & CL II wheels
Drivetrain: Shimano Ultegra Di2
Weight: 6.73kg (56cm)

Technical Specifications

Frameset

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

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

Brakes

• Front: Shimano Ultegra BR-R8170, hydraulic disc

• Rear: 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

• 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

• Front Tire: S-Works Turbo TLR Race Tire, 700x28c

• Rear Tire: S-Works Turbo TLR Race Tire, 700x28c

• Inner Tubes: 700x25-35, 50mm Presta Valve, TPU

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

Product Details

• Weight Size: 56

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