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S-Works Aethos

Shimano Dura-Ace Di2

3 Reviews

Don’t get us wrong, we’re all for racing. Grand Tour top steps, Classic’s Monuments—they’re…

Voted Best Brand 5 Years in a Row

#1 Again: 2023 Gran Fondo Awards

The riders have spoken! For the fifth year in a row, Specialized has been crowned the #1 “Drop Bar Bike Brand” in the prestigious Gran Fondo Best Brand Awards for 2023. We innovate for riders, and year after year, our bikes are loved by the most discerning riders. Thank you!

The lightest disc road frame ever: The Specialized Aethos

Product Details

Don’t get us wrong, we’re all for racing. Grand Tour top steps, Classic’s Monuments—they’re in our DNA. But sometimes riding simply to ride, riding for the love of riding, is just what we need. And this is what the Aethos lives for. Sure, it’s given nothing up to performance, and happens to be the lightest frame out there, but with no compromise to style. Aethos: Billions of calculations in the pursuit of one thing—the perfect ride.

Top off the world’s lightest frame with Shimano’s legendary Dura-Ace Di2 groupset and Roval’s featherweight Alpinist wheels and you’re left with a perfectly balanced top-tier ride that gives up nothing in the name of performance.

The Aethos frame has been designed with the perfect combination of ultimate ride feel, light weight, and style—from accelerating up steep pitches and descending technical descents, to all-day saddle comfort on even the longest coffee rides, the Aethos hits the mark. But how, you ask? By reinventing the traditional road shape found on bikes of the past, we’ve subtly altered these shapes to deliver massive gains in stiffness and balance, all without affecting weight or durability. Pair that with an entirely new layup and process that we’ve perfected over multiple decades and you have the lightest frame out there (585 grams, S-Works, size 56cm). The Aethos is more than just a new bike, it’s the first of a new breed.
A featherweight frame is useless without confidence-inspiring ride characteristics, which is why we’ve developed the Aethos to have the perfect balance of front and rear stiffness combined with exceptional ride quality. By studying the flexing and breathing of carbon fiber, we were able to discover groundbreaking findings about how forces flow through frames. Just a few pedal strokes and you’ll realize this sublime ride sets a new standard.
Every detail, from the derailleur hangers to the fork expander plug have been designed with style, weight, and durability in mind. We’ve also spec’d it with Roval’s all-new Alpinist carbon seatpost and wheels, further saving weight and improving ride characteristics. Everything in pursuit for the perfect ride.

Technical Specifications

Frameset

Frame

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

Suspension

Fork

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

Brakes

Front Brake

Shimano Dura-Ace 9200, Hydraulic Disc

Rear Brake

Shimano Dura-Ace 9200, Hydraulic Disc

Drivetrain

Shift Levers

Shimano Dura-Ace R9270, hydraulic disc

Front Derailleur

Shimano Dura-Ace R9250, braze-on

Rear Derailleur

Shimano Dura-Ace R9250, 12-speed

Cassette

Shimano Dura-Ace, 12-speed, 11-30t

Chain

Shimano XTR M9100, 12-speed w/ quick link

Crankset

Shimano Dura-Ace R9200, HollowTech II, 12-speed with 4iiii Precision Pro dual-sided powermeter

Chainrings

52/36T

Bottom Bracket

Shimano Dura-Ace, BB-R9100

Wheels & Tires

Front Tire

S-works Turbo 2BR, 700x28mm

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 Tire

S-works Turbo 2BR, 700x28mm

Rear Wheel

Roval Alpinist CLX, Tubeless, 21mm internal width carbon rim, 33mm depth, Win Tunnel Engineered, Roval AFD hub, 24h, DT Swiss Aerolite spokes

Inner Tubes

700x20-28, 48mm Presta Valve

Cockpit

Stem

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

Handlebars

S-Works Short & Shallow, 123mm Drop, 75mm Reach w/Di2 Hole

Tape

Supacaz Super Sticky Kush

Saddle

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

SeatPost

Roval Alpinist Carbon Seatpost

Seat Binder

Specialized Alloy, 30.0mm, titanium bolt

Accessories

Pedals

PEDAL, TEST RIDE PEDALS PROVIDED BY SPECIALIZED

Weight

6.34kg (13 lb, 15.6 oz)

Weight Size

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

Geometry

	49	52	54	56	58	61
Crank Length	165mm	170mm	172.5mm	172.5mm	175mm	175mm
Handlebar Width	380mm	400mm	420mm	420mm	440mm	440mm
Stem Length	80mm	90mm	100mm	100mm	110mm	110mm
Saddle Width	155mm	155mm	143mm	143mm	143mm	143mm
Seatpost Length	300mm	300mm	360mm	360mm	360mm	360mm
Wheelbase	973mm	975mm	978mm	991mm	1005mm	1012mm
Top Tube Length, Horizontal	508mm	531mm	540mm	562mm	577mm	595mm
Bike Standover Height	705mm	728mm	748mm	769mm	796mm	824mm
Seat Tube Length	431mm	462mm	481mm	504mm	532mm	567mm
Seat Tube Angle	75.5°	74°	74°	73.5°	73.5°	73°
Stack	514mm	527mm	544mm	565mm	591mm	612mm
Reach	375mm	380mm	384mm	395mm	402mm	408mm
Head Tube Length	109mm	120mm	137mm	157mm	184mm	204mm
Head Tube Angle	71.75°	72.5°	73°	73.5°	73.5°	74°
BB Height	266mm	266mm	268mm	268mm	268mm	268mm
BB Drop	74mm	74mm	72mm	72mm	72mm	72mm
Trail	63mm	58mm	58mm	55mm	55mm	52mm
Fork Length, Full	369mm	369mm	369mm	369mm	369mm	369mm
Fork Rake/Offset	47mm	47mm	44mm	44mm	44mm	44mm
Front Center	574mm	577mm	579mm	591mm	606mm	613mm
Chainstay Length	410mm	410mm	410mm	410mm	410mm	410mm

Manual Downloads

2021 Aethos User Manual

Specialized Bicycle Owner's Manual (All Languages)

2022 Rider/Bike Weight Limits and Terrain Conditions

Trainer Usage Addendum to the Bicycle Owner's Manual

Rider Reviews

3 Reviews

01/06/2024

Awesome bike - never stop smiling !

Yes this bike is light, and it doesn’t look overly like many more angular modern road bikes but you wait until you ride it. It handles like a dream & for sure its lightness helps on the hills. I marvel every time I ride mine at its effortless sure footed cornering and that it’s just such a huge pleasure to ride. Don’t think about it any longer - go on, take the plunge & get yourself one. You will truly never stop smiling!!!

Name:: Mags

Helpful?

12/06/2023

Inspiring

Yes; I read all the reviews, saw all the videos, but its only when I actually rode it that I really understood what Specialized have achieved here. It hearkens back to my childhood days when I first learn to ride a bike without the help of side wheels. With a big silly grin pasted on my face and the sensation of effortless freedom, I can tell you that this bike is not about KOM's or TT's or even winning races. In fact, if my GPS unit could measure Fun instead of Wattage, it would max-out on my every ride. For once; its all fun and games. No regrets.

Would Recommend?: Yes!

Name:: Marcel

Helpful?

08/10/2023

. Remarkable

I recently completed a 12K km cycling journey on the S-works Aethos Di2 M, mostly on roads in northeast Thailand. Mostly asphalt, including gravel and mountain terrain, yet the bike's frame hold and is hardly noticeable aside from your weight. This bike is a remarkable piece of cycling engineering and a worthwhile investment for both health and wealth. Price comes with a quality rarely these days, but this bike is the « rule them all.» I updated the chain and cassette once.

Name:: Dominique D.

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