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 RED eTap AXS 12-Speed Disc Road Bike 2021
Bike builds don't get much lighter than this and the Specialized S-Works Aethos Disc Road Bike pairs a FACT 12r carbon frameset with SRAM's flagship electronic RED eTap AXS 12-Speed groupset and Roval's lightest Alpinist CLX wheels.
A bike engineered to create the perfect ride, the Aethos breaks the UCI weight lower limit and is aimed at riders that may race, but wish for something that delivers performance and rides beautifully when off the circuit. The frame alone weighs an incredibly low 588 grams in a size 56, with the full build sitting at 6kg. The updated tubes and carbon layup are responsible for this, minimising material while enhancing stiffness, stability and integrity.
The geometry and fit are borrowed from the Tarmac SL7, so this is a bike still designed to feel aggressive, racy and responsive, so you're losing nothing in performance and ride feel in the quest for low weight. Rider-First Engineered™ design that's used across the Specialized range ensures all frames offer the same positive characteristics.
12-speed SRAM RED eTap components perfect the shifting experience and bring powerful hydraulic, all-condition braking that's confidence-inspiring at speed and on wet roads. There's even a crank-based power meter included, bringing a new dimension to your training. The aforementioned Alpinist wheels have a carbon rim, AeroFlange hubs and weigh only 1248 grams, delivering strength, stiffness and smooth-rolling. Finally, a Roval Alpinist carbon seatpost offers plenty of adjustabilities to dial in your fit.
Read more about the bikes in our Specialized S-Works Aethos article.
Highlights
- S-Works Aethos FACT 12r Carbon frame and fork
- Same fit and ride geometry as the Tarmac SL7
- Electronic cable routing specific frame
- 68mm BSA threaded bottom bracket
- Rider First Engineered™ design
- Frame only claimed weight - 585 grams, size 56cm
- SRAM RED eTAP AXS, 12-speed hydraulic disc components
- Power meter
- Roval Alpinist carbon seatpost
- Roval Alpinist CLX wheels and Specialized Turbo Cotton 26mm tyres
- 32mm tyre clearance
Technical Specification
| Frame | Specialized S-Works Aethos FACT 12r Carbon, Rider First Engineered™, 68mm BSA threaded BB, electronic cable routing only, 12x142mm thru-axle, flat-mount disc |
| Fork | Specialized S-Works FACT Carbon, 12x100mm thru-axle, flat-mount disc |
| Bottom Bracket | SRAM DUB BSA 68 |
| Stem | Specialized S-Works SL, alloy, titanium bolts, 6-degree rise |
| Handlebar | Specialized S-Works Short & Shallow |
| Bar Tape | Supacaz Super Sticky Kush |
| Front Brake | SRAM RED eTAP AXS, hydraulic disc |
| Rear Brake | SRAM RED eTAP AXS, hydraulic disc |
| Brake Levers | SRAM RED eTAP AXS |
| Front Derailleur | SRAM RED eTAP AXS, braze-on |
| Rear Derailleur | SRAM RED eTAP AXS, 12-speed |
| Shift Levers | SRAM RED eTAP AXS, 12-speed |
| Chain | SRAM RED, 12-speed |
| Cassette | SRAM RED, 10-33t, 12-speed |
| Crankset | SRAM RED AXS, power meter, 48/35T |
| Front Wheel | Roval Alpinist CLX, 21mm internal width carbon rim, 33mm depth, Win Tunnel Engineered, Roval AFD hub, 21h, DT Swiss Aerolite spokes |
| Rear Wheel | Roval Alpinist CLX, 21mm internal width carbon rim, 33mm depth, Win Tunnel Engineered, Roval AFD hub, 24h, DT Swiss Aerolite spokes |
| Front Tyre | Specialized Turbo Cotton, 320 TPI, 700x26mm, clincher |
| Rear Tyre | Specialized Turbo Cotton, 320 TPI, 700x26mm, clincher |
| Saddle | Specialized Body Geometry S-Works Power, carbon fibre rails, carbon fibre base |
| Seatpost | Roval Alpinist carbon seatpost |
| Pedals | Available to be purchased separately |
| Manufacturer Claimed Weight | 585 grams, frame only, size 56cm |
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.
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