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S-Works Aethos - SRAM Red eTap AXS


2021 S-Works Aethos - SRAM Red eTap AXS

For once, we’re not in it to win. With Aethos, we stopped worrying about winning, or the way things are supposed to be done, and instead chased the greatest expression of ride quality ever made. Well, we did it, and in staying true to keeping that promise, we broke every design, ride, and race rule along the way. And we’re not sorry. Aethos: Break the Rules.

Top off the world’s lightest frame with SRAM’s 12-speed RED eTAP AXS groupset and Roval’s featherweight Alpinist wheels and you’re left with a perfectly balanced top-tier ride that delivers everything in the name of performance.

Technical Specifications

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S-Works FACT Carbon, 12x100mm thru-axle, flat-mount disc



S-Works Aethos FACT 12r Carbon, Rider First Engineered™, Threaded BB, Electronic cable routing only, 12x142mm thru-axle, flat-mount disc

Seat Binder

Specialized Alloy, 30.0mm, titanium bolt



S-Works Short & Shallow, 125mm Drop, 75mm Reach w/Di2 Hole


S-Works SL, alloy, titanium bolts, 6-degree rise


Supacaz Super Sticky Kush


Body Geometry S-Works Power, carbon fiber rails, carbon fiber base


Roval Alpinist Carbon Seatpost


Rear Brake

SRAM RED eTAP AXS, hydraulic disc

Front Brake

SRAM RED eTAP AXS, hydraulic disc


Front Derailleur

SRAM RED eTAP AXS, braze-on

Rear Derailleur

SRAM RED eTAP AXS, 12-speed


SRAM RED XG-1290, 12-speed, 10-33t


SRAM RED AXS Power Meter

Bottom Bracket



SRAM CN Red 12-speed

Wheels & Tires

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 Tire

Turbo Cotton, 320 TPI, 700x26mm

Rear Tire

Turbo Cotton, 320 TPI, 700x26mm

Inner Tubes

Turbo Ultralight, 48mm Presta valve

* Weights based on production painted frames as pictured. Actual weights will vary based on colorway, frame size, and component variation. Specifications are subject to change without notice.


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Crank Length165mm170mm172.5mm172.5mm175mm175mm
Handlebar Width380mm400mm420mm420mm440mm440mm
Stem Length80mm90mm100mm100mm110mm110mm
Saddle Width155mm155mm143mm143mm143mm143mm
Seatpost Length300mm300mm360mm360mm360mm360mm
Head Tube Length109mm120mm137mm157mm184mm204mm
Head Tube Angle71.75°72.5°73°73.5°73.5°74°
BB Height266mm266mm268mm268mm268mm268mm
BB Drop74mm74mm72mm72mm72mm72mm
Fork Length, Full369mm369mm369mm369mm369mm369mm
Fork Rake/Offset47mm47mm44mm44mm44mm44mm
Front Center574mm577mm579mm591mm606mm613mm
Chainstay Length410mm410mm410mm410mm410mm410mm
Top Tube Length, Horizontal508mm531mm540mm562mm577mm595mm
Bike Standover Height705mm728mm748mm769mm796mm824mm
Seat Tube Length431mm462mm481mm504mm532mm567mm
Seat Tube Angle75.5°74°74°73.5°73.5°73°

Rider Reviews

  • 5
  • 3 Reviews

My best bike ever

Got mine in January 2021, love it, love it, love it. After 10 years and over 120,000 miles of riding with different brands and models. This bike is for sure the best bike I ever owned. If you have the money go for it and enjoy

Would Recommend?



…oh yeah - it's light too

If you follow most the press and the forums and the other things on the interwebs people are talking a lot about the weight and then about the price - in alternating order. This is the most fun and I'd say ""best"" bike I've ever owned and it's not because it's light. The uniqueness is how it feels on the ride: Compliant without being soft — playful but not nervous — elegant but extremely fast. The ride quality is exceptional. The bike is extremely comfortable to ride and the compliance adds traction which makes it an extremely confident descender. You can feel that you have more grip. The crazy things is that the compliance does not make the bike sluggish or soft when accelerating. The opposite: Putting down power almost feels like loading a spring that catapults you forward within milliseconds. I've ridden the bike with different wheel sets and can attribute this behavior clearly to the frame. The handling is quick but not nervous. The Geometry is essentially identical with the tarmac. This is NOT an endurance bike. It wants to go fast! And lastly: The bike is so much fun to ride. It feels light and elegant and quick and playful and is just a joy. …oh yeah - it's light too. All things considered the Tarmac is probably the faster bike (I've ridden the same climb on both bikes) and time and power were < 1% over 20 minutes and the Tarmac is more aero on the flat. But the Aethos is definitely more fun!

Cycle J.



you could be enjoying this bike to the fullest on some freshly paved mountain road or enjoying EIGHTY-FOUR THOUSAND CHICKEN NUGGETS for the same price. overall amazing

Kahlil K.