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Specialized Aethos Pro - Shimano Ultegra Di2

Specialized Aethos Pro - Shimano Ultegra Di2
  • Color: Satin Metallic White Sage/White Sage
  • Color: Satin Obsidian/Chaos Pearl Granite/Birch
Size: Select size
Wheel Size: 700c
Please select options Unavailable
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The Aethos line promises three things- exceptional light weight, perfectly-balanced ride characteristics, and undeniable style-and this Aethos Pro is no exception. Aethos: Billions of calculations in the pursuit of one thing-the perfect ride.

Spec'd with Shimano's Ultegra Di2 that delivers clean, crisp shifts and Roval's Alpinist wheels mated to DT Swiss 350 hubs and your left with a no-fuss build that delivers, mile after mile.

- 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

Frame Size (cm)495254565861
Crank Length (mm)165 170172.5172.5175175
Handlebar Width (mm)380 400420420440440
Stem Length (mm)80 90100100110110
Saddle Width (mm)155 155143143143143
Seatpost Length (mm)300 300360360360360
Wheelbase (mm)973 97597899110051012
Top Tube Length, Horizontal (mm)508 531540562577595
Bike Standover Height (mm)705 728748769796824
Seat Tube Length (mm)431 462481504532567
Seat Tube Angle (°)75.5 747473.573.573
Stack (mm)514 527544565591612
Reach (mm)375 380384395402408
Head Tube Length (mm)109 120137157184204
Head Tube Angle (°)71.75 72.57373.573.574
BB Height (mm)266 266268268268268
BB Drop (mm)74 7472727272
Trail (mm)63 5858555552
Fork Length, Full (mm)369 369369369369369
Fork Rake/Offset (mm)47 4744444444
Front Center (mm)574 577579591606613
Chainstay Length (mm)410 410410410410410


Pedals Test Ride Pedals Provided By Specialized
Fork FC070~72-2, 2021 Project 300 10r Disc
Stem Specialized Pro SL, alloy, 4-bolt
Chain Shimano XT M8100, 12-speed w/ quick link
Frame IC091-1, 2021 Project 300 10r Disc
Tires S-works Turbo 2BR, 700x28mm
Saddle Body Geometry Power Pro, hollow titanium rails
Wheels F: Roval Alpinist CL, Tubeless, 21mm internal width carbon rim, 33mm depth, Win Tunnel Engineered, DT for Roval 350 hub, DT Swiss Aerolite spokes, R: Roval Alpinist CL, Tubeless, 21mm internal width carbon rim, 33mm depth, Win Tunnel Engineered, DT for Roval 350 hub, DT Swiss Aerolite spokes
Crankset Shimano Ultegra R81000
Seatpost Roval Alpinist Carbon Seatpost
Shifters Shimano Ultegra R8170, hydraulic disc
Chainrings 50/34T
Handlebars S-Works Short & Shallow, 125mm Drop, 75mm Reach w/Di2 Hole
Tape/Grips Supacaz Super Sticky Kush
Bottom Bracket Shimano Threaded BSA BB
Rear Derailleur Shimano Ultegra R8150, 12-speed
Front Derailleur Shimano Ultegra R8150, braze-on
Cassette/Freewheel Shimano Ultegra, 12-speed, 11-30t

* Subject to change without notice.

Part Numbers

Option UPC MPN
Satin Metallic White Sage/White Sage / 56cm / 700c 888818865079 97223-1156
Satin Metallic White Sage/White Sage / 58cm / 700c 888818864980 97223-1158
Satin Metallic White Sage/White Sage / 61cm / 700c 888818864454 97223-1161
Satin Obsidian/Chaos Pearl Granite/Birch / 61cm / 700c 888818863198 97223-1061