Name: Specialized Aethos 2 Pro – Shimano Ultegra Di2 (2026)
Brand: Specialized
SKU: 97226-1149
Price: 5449.0 GBP
Availability: OutOfStock

Specialized Aethos 2 Pro Ultegra Di2 road bike in Gloss Red Sky/Chrome, view 1

Specialized Aethos 2 Pro Ultegra Di2 road bike in Gloss Red Sky/Chrome, view 2

Specialized Aethos 2 Pro Ultegra Di2 road bike in Gloss Red Sky/Chrome, view 3

Specialized Aethos 2 Pro Ultegra Di2 road bike in Gloss Red Sky/Chrome, view 4

Specialized Aethos 2 Pro Ultegra Di2 road bike in Gloss Red Sky/Chrome, view 5

Specialized Aethos 2 Pro Ultegra Di2 road bike in Gloss Red Sky/Chrome, view 6

£5,449.00

This bike is available through the Cycle to Work Scheme

Unsure of your size?

Book a sizing appointment in our bike fit studio and get the right fit.

With a 705g FACT 10r carbon frame, the Aethos 2 is the lightest bike in its class – but weight was never the whole point. It was built by breaking racing's rules to deliver pure road-riding joy, and it's engineered to disappear beneath you: responsive, supple and sublime.

The Pro build pairs Shimano Ultegra Di2 and a 4iiii power meter with Roval Alpinist CL II carbon wheels and the one-piece Roval Alpinist Integrated Cockpit II. It's a light, beautifully balanced bike at just 6.73kg (size 56).

Highlights

Aethos 2 FACT 10r carbon frame, 705g, Rider-First Engineered
Shimano Ultegra Di2 2x12 with 4iiii power meter
Roval Alpinist CL II carbon tubeless-ready wheels with 28mm S-Works Turbo tyres
Roval Alpinist Integrated Cockpit II
Clearance for 35mm tyres
6.73kg, size 56

Sizes and fit

Available in 49cm, 52cm, 54cm, 56cm, 58cm and 61cm.

Colours

Gloss Red Sky / Chrome.

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

Drivetrain

Shift levers: Shimano Ultegra Di2 R8170, hydraulic disc
Front derailleur: Shimano Ultegra Di2 R8150, braze-on
Rear derailleur: Shimano Ultegra Di2 R8150, 12-speed
Cassette: Shimano Ultegra, 12-speed, 11-30t
Chain: Shimano XT CN-M8100, 12-speed
Crankset: Shimano Ultegra R8100 with 4iiii Precision 3+ single-sided power meter, 52/36t
Bottom bracket: Shimano threaded BSA
Brakes: Shimano Ultegra BR-R8170, hydraulic disc

Wheels and tyres

Wheels: 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
Tyres: S-Works Turbo TLR, 700x28
Inner tubes: 700x25-35mm TPU, 50mm Presta valve

Cockpit and contact points

Handlebars: Roval Alpinist Cockpit II, integrated bar and stem
Bar tape: Supacaz Super Sticky Kush
Saddle: Power Pro Mirror, hollow Ti rails
Seatpost: Roval Alpinist Carbon
Seat binder: Specialized alloy, 30mm

Weight

Weight: 6.73kg (size 56)

Free UK shipping available on all orders, excluding bikes, wheelsets and packages over 10kg in weight e.g. turbo trainers.

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So Light, It's a Crime

Aethos 2 is the lightest road bike in its class, thanks to Flow State Design. It started with a simple insight: frames 'breathe' under load, and that rhythm shows exactly how force moves through them.

Specialized fed that into its supercomputer and evolved the tubes into sculpted forms, where shape itself delivers stiffness. The result is a lighter frame and a more perfect ride.

Rider on a Specialized Aethos 2 in the mountains

Geometry and Fit, Perfected

Specialized refined the Aethos 2 geometry using data from more than 100,000 Body Geometry bike fits, creating a Performance Endurance position that works for more riders than ever.

Climb faster, descend harder and ride longer, with precise handling in a more versatile, confidence-inspiring package.

Specialized Aethos 2 on a rough road with 35mm tyres

More Clearance, No Compromise

Aethos 2 clears 35mm tyres with ease, so you get smoother, faster rides, more grip and more roads to explore.

That kind of upgrade usually adds weight. Not here: with its most optimised layup yet and every detail re-engineered, no gram was safe from the Specialized Science Club.

Rider climbing on a Specialized Aethos 2

Built for the Love of the Ride

Aethos 2 was built by breaking racing's rules. Free from aero constraints, Specialized focused purely on ride feel: responsive, supple and sublime.

The result is a bike that disappears beneath you, whether you're chasing a climb, flowing down a descent or simply enjoying a long day out.