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Aethos 2 Expert
Shimano Ultegra Di2
$8,499.99
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The lightest production bike in its class in pursuit of the perfect ride for more riders.
Color:
Gloss Dolomite Metallic
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Complete Your Ride
Aethos 2
Break the Rules
Aethos 2
Break the Rules
With a 705g frame, the Aethos 2 is the lightest bike in its class. But weight was never the point. Built by breaking racing’s rules to deliver pure road riding bliss, it’s engineered to disappear beneath you: responsive, supple, and sublime. Now with increased tire clearance, refined components, and data-based fit-enhancing geometry, it brings that transcendent ride feel to more riders than ever. Aethos 2 breaks the rules, for the love of the ride.
At a Glance
Use
Performance Road Riding
Frameset
705g FACT 10r Frame / FACT 10r Fork
Fit
Performance Endurance
Cockpit & Wheels
Roval Alpinist bar, Pro SL stem, C38 wheels
Drivetrain
Shimano Ultegra Di2
Weight
7.12kg (56cm)
So Light, It’s a Crime
The Lightest Road Bike In Its Class, Thanks to Flow State Design
Aethos began with a moment of human insight: frames “breath” under load. That subtle rhythm revealed how force moved. We fed this into our supercomputer, evolving tubes into sculpted forms. Shape itself delivered stiffness. The result wasn’t just the lightest road bike in its class and a more perfect ride, it was a new way of making bikes - Flow State Design.
More Versatility. More Clearance. No Compromise.
No Gram was Safe from Our Scalpel
Aethos 2 clears 35 mm tires with ease. That means smoother, faster rides, more grip, and more roads. That kind of upgrade usually comes at a cost. Not here. We didn’t just create our most optimized layup ever, we re-engineered every detail. No gram was safe from the Specialized Science Club’s obsession.
Explore the Lineup
Technical Specifications
Frameset
Frame
Aethos 2 FACT 10r Carbon, Rider First Engineered™, Threaded BB, Hidden Cable Routing, 12x142mm thru-axle, flat-mount disc
Suspension
Fork
Aethos 2 FACT 10r Carbon, 12x100mm thru-axle, flat-mount disc
Brakes
Front Brake
Shimano Ultegra BR-R8170 Hydraulic Brake
Rear Brake
Shimano Ultegra BR-R8170 Hydraulic Brake
Drivetrain
Shift Levers
Shimano Ultegra Di2 R8170, hydraulic disc
Front Derailleur
Shimano Ultegra Di2 R8150, braze-on
Rear Derailleur
Shimano Ultegra Di2 R8150, 12-speed
Cassette
Shimano Ultegra, 12-speed, 11-30t
Chain
Shimano XT M8100, 12-speed w/ quick link
Crankset
Shimano Ultegra R8100, 52/36t
Bottom Bracket
Shimano Threaded BSA BB
Wheels & Tires
Front Wheel
Roval C38, 21mm internal width carbon rim
Front Tire
S-Works Turbo, 700x28
Rear Tire
S-Works Turbo, 700x28
Rear Wheel
Roval C38, 21mm internal width carbon rim
Inner Tubes
700x20-28, 48mm Presta Valve
Cockpit
Stem
Specialized Pro SL, alloy, 4-bolt
Handlebars
Roval Alpinist Carbon Handlebar, 125mm drop, 75mm reach
Tape
Supacaz Super Sticky Kush
Saddle
Body Geometry Power Expert
SeatPost
Roval Alpinist Carbon Seatpost
Seat Binder
Specialized Alloy, 30mm
Product Details
Product ID
221565
Weight
Weight
7.12 kg (15 lb, 11.2 oz), tubeless
Weight Size
56
* 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.
Geometry
| 49 | 52 | 54 | 56 | 58 | 61 | |
|---|---|---|---|---|---|---|
| Crank Length | 165mm | 170mm | 172.5mm | 172.5mm | 175mm | 175mm |
| Handlebar Width | 380mm | 400mm | 400mm | 420mm | 420mm | 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 |
| Stack | 522mm | 538mm | 559mm | 580mm | 606mm | 627mm |
| Reach | 373mm | 377mm | 384mm | 391mm | 398mm | 404mm |
| Head Tube Length | 114mm | 128mm | 150mm | 169mm | 198mm | 218mm |
| Head Tube Angle | 71.4° | 72.1° | 72.5° | 73° | 73° | 73.5° |
| BB Height | 265.5mm | 265.5mm | 267mm | 267mm | 268.5mm | 268.5mm |
| BB Drop | 76.5mm | 76.5mm | 75mm | 75mm | 73.5mm | 73.5mm |
| Trail | 62mm | 58mm | 55mm | 55mm | 55mm | 52mm |
| Fork Length, Full | 372mm | 372mm | 372mm | 372mm | 372mm | 372mm |
| Fork Rake/Offset | 50mm | 50mm | 50mm | 47mm | 47mm | 47mm |
| Front Center | 581mm | 584mm | 594mm | 599mm | 614mm | 621mm |
| Chainstay Length | 410mm | 410mm | 410mm | 410mm | 410mm | 410mm |
| Wheelbase | 978mm | 981mm | 992mm | 998mm | 1013mm | 1020mm |
| Top Tube Length, Horizontal | 508mm | 526mm | 544mm | 557mm | 572mm | 584mm |
| Bike Standover Height | 719mm | 737mm | 759mm | 779mm | 805mm | 834mm |
| Seat Tube Length | 450mm | 470mm | 490mm | 510mm | 535mm | 570mm |
| Seat Tube Angle | 75.5° | 74.5° | 74° | 74° | 74° | 74° |
Manual Downloads
For safety warnings please refer to the documentation in the Manual Downloads section of this page.
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