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Specialized Aethos Expert

Specialized Aethos Expert
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Aethos: Billions of calculations in the pursuit of one thing, the perfect ride. It's more than just a motto, it's a philosophy. The Aethos has been designed to straddle the line between a perfected ride quality, extreme lightweight, and undeniable style, and this Expert model is no exception.

With quick-shifting, low-maintenance Ultegra Di2 electronic shifting and hydraulic disc brakes paired with bomb-proof Roval C38 Disc carbon wheels, you have the perfect steed to get you out on the road.

- 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, further saving weight and improving ride characteristics. Everything in pursuit for the perfect ride.

- 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.


Geometry Chart:
Frame Size495254565861
Stack (mm) 514 527 544 565 591 612
Reach (mm) 375 380 384 395 402 408
Head Tube Length (mm) 109 120 137 157 184 204
Head Tube Angle 71.75° 72.5° 73° 73.5° 73.5° 74°
BB Height (mm) 266 266 268 268 268 268
BB Drop (mm) 74 74 72 72 72 72
Trail (mm) 63 58 58 55 55 52
Fork Length, Full (mm) 369 369 369 369 369 369
Fork Rake/Offset (mm) 47 47 44 44 44 44
Front Center (mm) 574 577 579 591 606 613
Chainstay Length (mm) 410 410 410 410 410 410
Wheelbase (mm) 973 975 978 991 1005 1012
Top Tube Length, Horizontal (mm) 508 531 540 562 577 595
Bike Standover Height (mm) 705 728 748 769 796 824
Seat Tube Length (mm) 431 462 481 504 532 567
Seat Tube Angle 75.5° 74° 74° 73.5° 73.5° 73°
Frame SizeHeight (inches)Height (cm)
49 5'1"-5'4" 155-163cm
52 5'4"-5'7" 163-170cm
54 5'7"-5'9" 170-175cm
56 5'9"-5'11" 175-180cm
58 5'11"-6'2" 180-188cm
61 6'2"-6'5" 188-196cm


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
Wheels Roval C38, 21mm internal width carbon rim
Tires S-Works Turbo, 120 TPI, folding bead, BlackBelt protection, 700x26mm
Bottom Bracket Shimano Threaded BSA BB
Crankset Shimano Ultegra R8100
Chainrings 52/36T
Shifters Shimano Ultegra R8170, hydraulic disc
Front Derailleur Shimano Ultegra R8150, braze-on
Rear Derailleur Shimano Ultegra R8150, 12-speed
Cassette/Freewheel Shimano Ultegra, 12-speed, 11-30t
Chain Shimano Ultegra, 12-speed
Brakes Shimano Ultegra R8170, hydraulic disc
Handlebars Specialized Expert Shallow Drop, alloy, 125mm drop x 75mm reach
Tape/Grips Supacaz Super Sticky Kush
Stem Specialized Pro SL, alloy, 4-bolt
Seatpost Roval Alpinist Carbon Seatpost
Saddle Body Geometry Power Expert, titanium rails
Pedals Sold separately

* Subject to change without notice.