Description
Specialized Aethos 2 Expert Ultegra Di2 Road Bike 2026
The Specialized Aethos Expert Di2 Road Bike was created to free the rider, delivering a pure and timeless riding experience where effort disappears and rider and machine move as one.
Specialized Aethos 2 Refined Geometry
The Aethos 2 refines geometry, increases tyre clearance, and introduces new Roval components while retaining the sublime ride feel that defined the original. Every improvement was made to extend the experience to more riders without compromise. Drawing on decades of Body Geometry data, the Aethos 2 offers a fit that suits more riders than ever. A taller stack, longer wheelbase, slacker head tube, and lower bottom bracket combine for stable handling, greater comfort, and improved control.
Specialized Flow State Design
Born from the discovery of how frames flex under load, Flow State Design optimises tube shapes rather than adding stiffness layers. The result is a lighter frame with improved ride quality, greater structural integrity, and unmatched durability.
Specialized Aethos 2 Greater Clearance
The Aethos 2 clears 35 mm tyres with ease, adding versatility and comfort without increasing weight. Achieving this required an entirely new carbon layup, perfected through countless refinements for the most elegant ride yet.
Specialized Aethos 2 Lightness with Strength
Despite its feathery weight of 705 g, the frame endures testing far beyond industry standards, withstanding over 100,000 pedal strokes at 2,377 watts without issue. Lightness meets strength in perfect balance.
Technical Specification
| 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 |
| Front Brake | Shimano Ultegra BR-R8170 Hydraulic Brake |
| Rear Brake | Shimano Ultegra BR-R8170 Hydraulic Brake |
| 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 M8100, 12-Speed with Quick Link |
| Crankset | Shimano Ultegra R8100, 52/36t |
| Bottom Bracket | Shimano Threaded BSA BB |
| Front Wheel | Roval C38, 21mm Internal Width Carbon Rim |
| Front Tyre | S-Works Turbo, 700x28 |
| Rear Wheel | Roval C38, 21mm Internal Width Carbon Rim |
| Rear Tyre | S-Works Turbo, 700x28 |
| Inner Tubes | 700x20-28, 48mm Presta Valve |
| Stem | Specialized Pro SL, Alloy, 4-Bolt |
| Handlebars | Roval Alpinist Carbon Handlebar, 125mm Drop, 75mm Reach |
| Tape | Supacaz Super Sticky Kush |
| Saddle | Body Geometry Power Expert |
| Seatpost | Roval Alpinist Carbon Seatpost |
| Seat Binder | Specialized Alloy, 30mm |
| Claimed Weight | 7.12 kg (15 lb 11.2 oz) |
| Weight Size | 56 |
Built, Checked, Tuned and Tested
All our bikes are fully built, checked, tuned and tested by our Cytech qualified mechanics and then securely packaged, ready for delivery. All you have to do is add the pedals (if included), attach the handlebars to the stem and tighten them following the included detailed instructions or by watching our video and using the provided FREE tools. Visit our Bike Assembly page to see how you assemble your new bike once you receive it.
All bikes collected from our shop, are built, tested and ready to ride. For hassle-free home delivery and bike set-up from a qualified mechanic use our Premier Delivery Service.
Please note, occasionally, manufacturers may change the specification without notice. Bicycles do not come with pedals unless otherwise specified. Bikes ordered for delivery will not arrive with the pedals installed, please refer to the owners manual and pedal installation guides provided for guidance. We do not install accessories to bikes, including mudguards. Bikes ordered for delivery that have tubeless compatible tyres and rims will arrive with inner tubes installed or with tubeless valves installed, this will be brand dependent. Sealant is available to be purchased separately.
If you require any assistance please contact our Customer Care team.
Size Guide
Specialized Aethos 2 Expert Ultegra Di2 Road Bike 2026 Sizing
Delivery & Returns
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Why buy your bike from Sigma Sports?
Don't hesitate to reach out to us. It's our goal to answer all of your questions and offer the best advice from our experts. We’ll be happy to answer any questions you may have. Contact us now or visit us in-store.
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