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 Aethos Pro Ultegra Di2 Disc Road Bike
The Aethos series pledges an extraordinary trifecta—remarkable lightness, impeccably balanced ride qualities, and unmistakable style—and the Aethos Pro lives up to this commitment. Representing the culmination of countless calculations in the quest for the ultimate ride, the Aethos boasts a Shimano Ultegra Di2 drivetrain for seamless, precise shifts and is equipped with Roval’s Alpinist wheels paired with DT Swiss 350 hubs, ensuring a reliable and straightforward build that delivers mile after mile. Crafted to perfection, the Aethos frame achieves an optimal blend of exceptional ride feel, minimal weight, and eye-catching style. Through innovative adjustments to traditional road shapes, we've enhanced stiffness and balance without compromising weight or durability. Weighing in at a mere 585 grams (S-Works, size 56cm), the Aethos isn't just a new bike; it marks the dawn of a new era. Beyond its featherweight frame, the Aethos excels in providing confidence-inspiring ride characteristics, balancing front and rear stiffness with an unparalleled ride quality. Meticulously designed details, from derailleur hangers to the fork expander plug, prioritize style, weight, and durability. Featuring Roval’s new Alpinist carbon seatpost and wheels, the Aethos goes above and beyond in the pursuit of the perfect ride.
Technical Specification
| Frame | Aethos FACT 10r Carbon, Rider First Engineered™, Threaded BB, 12x142mm thru-axle, flat-mount disc |
| Fork | FACT Carbon, 12x100mm thru-axle, flat-mount disc |
| Saddle | Body Geometry Power Pro, hollow titanium rails |
| SeatPost | Roval Alpinist Carbon Seatpost |
| Handlebars | S-Works Short & Shallow, 125mm Drop, 75mm Reach w/Di2 Hole |
| Seat Binder | Specialized Alloy, 30mm |
| Stem | Specialized Pro SL, alloy, 4-bolt |
| Tape | Supacaz Super Sticky Kush |
| Front Brake | Shimano Ultegra R8170, hydraulic disc |
| Rear Brake | Shimano Ultegra R8170, hydraulic disc |
| Chainrings | 52/36T |
| Bottom Bracket | Shimano Threaded BSA BB |
| Crankset | Shimano Ultegra R81000 |
| Rear Derailleur | Shimano Ultegra R8150, 12-speed |
| Front Derailleur | Shimano Ultegra R8150, braze-on |
| Shift Levers | Shimano Ultegra R8170, hydraulic disc |
| Cassette | Shimano Ultegra, 12-speed, 11-30t |
| Chain | Shimano M8100, 12-speed w/ quick link |
| Inner Tubes | 700x20-28, 48mm Presta Valve |
| Front Wheel | Roval Alpinist CL, Tubeless, 21mm internal width carbon rim, 33mm depth, Win Tunnel Engineered, DT for Roval 350 hub, DT Swiss Aerolite spokes |
| Rear Wheel | Roval Alpinist CL, Tubeless, 21mm internal width carbon rim, 33mm depth, Win Tunnel Engineered, DT for Roval 350 hub, DT Swiss Aerolite spokes |
| Front Tire | S-works Turbo 2BR, 700x28mm |
| Rear Tire | S-works Turbo 2BR, 700x28mm |
| Weight Size | 56 |
| Weight | 6.93kg (15 lb, 4.4 oz) |
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 Aethos Pro Ultegra Di2 Disc 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".