Specialized Aethos 2 Expert Road Bike, Ultegra Di2

£5,499.00 £4,199.00 Save £1,300.00

Tax included.

This bike is available through the Cycle to Work Scheme

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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 Expert build pairs Shimano Ultegra Di2 electronic shifting with Roval C38 carbon wheels, a Roval Alpinist carbon bar and a Pro SL stem. With its Performance Endurance fit and room for 35mm tyres, it's a superb all-rounder at 7.12kg (size 56).

Highlights

Aethos 2 FACT 10r carbon frame, 705g, Rider-First Engineered
Shimano Ultegra Di2 2x12
Roval C38 carbon tubeless-ready wheels with 28mm S-Works Turbo tyres
Roval Alpinist carbon handlebar and Specialized Pro SL stem
Clearance for 35mm tyres
7.12kg, size 56

Sizes and fit

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

Colours

Gloss Dolomite Metallic / Blue Pearl Over Shadow Silver.

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, 52/36t
Bottom bracket: Shimano threaded BSA
Brakes: Shimano Ultegra BR-R8170, hydraulic disc

Wheels and tyres

Wheels: Roval C38, 21mm internal width carbon rim, tubeless ready
Tyres: S-Works Turbo, 700x28
Inner tubes: 700x20-28mm, 48mm Presta valve

Cockpit and contact points

Stem: Specialized Pro SL, alloy, 4-bolt
Handlebars: Roval Alpinist Carbon, 125mm drop, 75mm reach
Bar tape: Supacaz Super Sticky Kush
Saddle: Body Geometry Power Expert
Seatpost: Roval Alpinist Carbon
Seat binder: Specialized alloy, 30mm

Weight

Weight: 7.12kg (size 56)

Size	49cm	52cm	54cm	56cm	58cm	61cm
Stack (mm)	522	538	559	580	606	627
Reach (mm)	373	377	384	391	398	404
Seat tube length (mm)	450	470	490	510	535	570
Top tube (effective) (mm)	508	526	544	557	572	584
Head tube length (mm)	114	128	150	169	198	218
Head tube angle (°)	71.4	72.1	72.5	73	73	73.5
Seat tube angle (°)	75.5	74.5	74	74	74	74
Chainstay length (mm)	410	410	410	410	410	410
BB drop (mm)	76.5	76.5	75	75	73.5	73.5
BB height (mm)	265.5	265.5	267	267	268.5	268.5
Wheelbase (mm)	978	981	992	998	1013	1020
Front centre (mm)	581	584	594	599	614	621
Fork length (mm)	372	372	372	372	372	372
Fork offset (mm)	50	50	50	47	47	47
Trail (mm)	62	58	55	55	55	52
Standover (mm)	719	737	759	779	805	834

Same frame geometry across S-Works (FACT 12r) and FACT 10r Aethos 2 models.

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

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.

A perfect fit on the Specialized Aethos 2 Expert – Shimano Ultegra Di2 (2026)

Not sure what size you need? Want to ensure this Specialized Aethos 2 Expert – Shimano Ultegra Di2 (2026) fits perfectly from your first pedal stroke?

Book a free sizing appointment in the Fit Studio at Velo Edge.

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