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.
All our bikes are fully built by our Cytech qualified mechanics. To find out more, see the Built, Checked, Tuned and Tested section below to see how we'll deliver your bike.
We offer FREE DELIVERY of your bike to your home or place of work. Once you've placed your order, our Customer Care team will be in contact to offer a convenient delivery date of your choice.
Cyclescheme can save you up to 39% on a bike and accessories. Visit our Cycle to Work Scheme page to learn more and 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.
- 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
|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.
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 or contact Customer Care. We do not install accessories to bikes, including mudguards.