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.
Save up to 47% with any one of our 11 Cycle to Work partners, and get the health benefits of a new bike in exchange for tax free salary sacrifice. To find out more about our various partners and how to apply click here.
Choose between Free Bike Delivery - to your home or place of work - or our new Premier Bike Delivery Service £99.99 and have your bike delivered "ready to ride" and set up to your measurements with seatpost and pedals adjusted on arrival by a qualified bike mechanic. Either way, our Customer Care team will be in touch to arrange a delivery date to suit you.
We've partnered with Laka to offer you 30 days free bike Insurance on your new bike purchase over £400. Click here for more info and find out how to claim.
Specialized S-Works Aethos Dura Ace Di2 Road Bike
The Aethos epitomizes the joy of cycling, embracing the essence of riding for the sheer love of it while maintaining peak performance. As the lightest frame available, it seamlessly integrates Shimano’s revered Dura-Ace Di2 groupset and Roval’s Alpinist wheels to create a top-tier ride experience without compromise. Crafted with meticulous attention to detail, the Aethos strikes the perfect balance between ultimate ride feel, lightweight design, and impeccable style, delivering unmatched comfort and performance whether navigating steep climbs or leisurely coffee rides.
Behind its featherweight construction lies a groundbreaking approach to frame design, leveraging innovative shaping techniques and decades of expertise to enhance stiffness and balance without adding bulk. Engineered for confidence-inspiring ride characteristics, the Aethos achieves a harmonious blend of front and rear stiffness, coupled with exceptional ride quality derived from in-depth studies of carbon fiber behavior. From derailleur hangers to fork expander plugs, every element is thoughtfully crafted to optimize style, weight, and durability. Further enhancing its prowess are Roval’s Alpinist carbon seatpost and wheels, meticulously selected to elevate performance and save weight. In the pursuit of the perfect ride, the Aethos stands not just as a new bike, but as the vanguard of a transformative era in cycling excellence.
Technical Specification
| Frame | S-Works Aethos FACT 12r Carbon, Rider First Engineered™, Threaded BB, Electronic cable routing only, 12x142mm thru-axle, flat-mount disc |
| Fork | S-Works FACT Carbon, 12x100mm thru-axle, flat-mount disc |
| Saddle | Body Geometry S-Works Power, carbon fiber rails, carbon fiber base |
| SeatPost | Roval Alpinist Carbon Seatpost |
| Stem | S-Works SL, alloy, titanium bolts, 6-degree rise |
| Handlebars | S-Works Short & Shallow, 123mm Drop, 75mm Reach w/Di2 Hole |
| Seat Binder | Specialized Alloy, 30.0mm, titanium bolt |
| Tape | Supacaz Super Sticky Kush |
| Front Brake | Shimano Dura-Ace 9200, Hydraulic Disc |
| Rear Brake | Shimano Dura-Ace 9200, Hydraulic Disc |
| Chainrings | 52/36T |
| Shift Levers | Shimano Dura-Ace R9270, hydraulic disc |
| Crankset | Shimano Dura-Ace R9200, HollowTech II, 12-speed with 4iiii Precision Pro dual-sided powermeter |
| Rear Derailleur | Shimano Dura-Ace R9250, 12-speed |
| Front Derailleur | Shimano Dura-Ace R9250, braze-on |
| Cassette | Shimano Dura-Ace, 12-speed, 11-30t |
| Bottom Bracket | Shimano Dura-Ace, BB-R9100 |
| Chain | Shimano XTR M9100, 12-speed w/ quick link |
| Inner Tubes | 700x20-28, 48mm Presta Valve |
| Front Wheel | Roval Alpinist CLX, Tubeless, 21mm internal width carbon rim, 33mm depth, Win Tunnel Engineered, Roval AFD hub, 21h, DT Swiss Aerolite spokes |
| Rear Wheel | Roval Alpinist CLX, Tubeless, 21mm internal width carbon rim, 33mm depth, Win Tunnel Engineered, Roval AFD hub, 24h, DT Swiss Aerolite spokes |
| Front Tire | S-works Turbo 2BR, 700x28mm |
| Rear Tire | S-works Turbo 2BR, 700x28mm |
| WEIGHT | |
| Weight | 6.34kg (13 lb, 15.6 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.
Specialized S-Works Aethos Dura Ace Di2 Road Bike Sizing
Unable to display Reviews due to Privacy Settings.
Adjust your Cookie Preferences to Opt-in "YES" to "Functional Cookies".
Unable to display Q&A due to Privacy Settings.
Adjust your Cookie Preferences to Opt-in "YES" to "Functional Cookies".