2025 Specialized Aethos Pro - Shimano Ultegra Di2
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Aethos Pro
Shimano Ultegra Di2 · FACT 10r · 6.78kg
The Aethos line promises three things — exceptional light weight, perfectly-balanced ride characteristics, and undeniable style — and this Aethos Pro is no exception. Billions of calculations in the pursuit of one thing: the perfect ride.
- Aethos FACT 10r Carbon Frame: Perfect balance of light weight, stiffness, and ride quality.
- FACT Carbon Fork: 12x100mm thru-axle, flat-mount disc.
- Shimano Ultegra Di2 R8150: 12-speed electronic shifting, hydraulic disc.
- 4iiii Precision 3+ Powermeter: Single-sided power meter built into R8100 crankset.
- Roval Alpinist CL II Wheels: Win Tunnel Engineered, 33mm depth, DT for Roval 350 hubs.
- Body Geometry Power Pro Mirror: Hollow titanium rails, pressure-relief design.
- S-Works Turbo 2BR Tires: 700x28c, fast rolling compound.
- Roval Alpinist Cockpit: Carbon seatpost, S-Works Short & Shallow bars with Di2 hole.
Complete build at 6.78kg (56cm). Six sizes: 49, 52, 54, 56, 58, 61.
Aethos FACT 10r Carbon Frame
Perfect combination of ultimate ride feel, light weight, and style. By reinventing traditional road shapes we've subtly altered shapes to deliver massive gains in stiffness and balance without affecting weight or durability.
Shimano Ultegra Di2 Electronic Shifting
12-speed Di2 with R8150 front/rear derailleurs, R8170 hydraulic levers. R8100 crankset (52/36t) with 4iiii Precision 3+ single-sided power meter. Clean, crisp shifts every time.
Roval Alpinist CL II Wheels
Tubeless-ready carbon clinchers, 33mm depth, 21mm internal width. Win Tunnel Engineered for optimal aerodynamics. DT for Roval 350 hubs, DT Swiss Aerolite spokes.
Perfect Balance
Just a few pedal strokes and you'll realize this sublime ride sets a new standard. Every detail — derailleur hangers, fork expander plug — designed with style, weight, and durability in mind.
Roval Alpinist Cockpit
Roval Alpinist Carbon seatpost, S-Works Short & Shallow bars (125mm drop, 75mm reach, Di2 hole), Specialized Pro SL stem. Clean lines, carbon elegance.
| 49 | 52 | 54 | 56 | 58 | 61 | |
|---|---|---|---|---|---|---|
| Crank Length | 165 | 170 | 172.5 | 172.5 | 175 | 175 |
| Handlebar Width | 380 | 400 | 420 | 420 | 440 | 440 |
| Stem Length | 80 | 90 | 100 | 100 | 110 | 110 |
| Saddle Width | 155 | 155 | 143 | 143 | 143 | 143 |
| Seatpost Length | 300 | 300 | 360 | 360 | 360 | 360 |
| Stack | 514 | 527 | 544 | 565 | 591 | 612 |
| Reach | 375 | 380 | 384 | 395 | 402 | 408 |
| Head Tube Length | 109 | 120 | 137 | 157 | 184 | 204 |
| Head Tube Angle | 71.75° | 72.5° | 73° | 73.5° | 73.5° | 74° |
| BB Height | 266 | 266 | 268 | 268 | 268 | 268 |
| BB Drop | 74 | 74 | 72 | 72 | 72 | 72 |
| Trail | 63 | 58 | 58 | 55 | 55 | 52 |
| Fork Length, Full | 369 | 369 | 369 | 369 | 369 | 369 |
| Fork Rake/Offset | 47 | 47 | 44 | 44 | 44 | 44 |
| Front Center | 574 | 577 | 579 | 591 | 606 | 613 |
| Chainstay Length | 410 | 410 | 410 | 410 | 410 | 410 |
| Wheelbase | 973 | 975 | 978 | 991 | 1005 | 1012 |
| Top Tube Length, Horizontal | 508 | 531 | 540 | 562 | 577 | 595 |
| Bike Standover Height | 705 | 728 | 748 | 769 | 796 | 824 |
| Seat Tube Length | 431 | 462 | 481 | 504 | 532 | 567 |
| Seat Tube Angle | 75.5° | 74° | 74° | 73.5° | 73.5° | 73° |
Frameset
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
Seat Binder
Specialized Alloy, 30mm
Brakes
Front Brake
Shimano Ultegra R8170, hydraulic disc, 160mm rotor
Rear Brake
Shimano Ultegra R8170, hydraulic disc, 140mm rotor
Brake Levers
Shimano Ultegra Di2 R8170, hydraulic disc
Drivetrain
Bottom Bracket
Shimano Threaded BSA BB
Chain
Shimano M8100, 12-speed w/ quick link
Crankset
Shimano Ultegra R8100, 52/36t
Powermeter
4iiii Precision 3+, single-sided
Front Derailleur
Shimano Ultegra Di2 R8150, braze-on
Cassette
Shimano Ultegra, 12-speed, 11-30t
Rear Derailleur
Shimano Ultegra Di2 R8150, 12-speed
Wheels & Tires
Front Wheel
Roval Alpinist CL II, 21mm internal width carbon rim, 33mm depth, Win Tunnel Engineered, DT for Roval 350 hub, DT Swiss Aerolite spokes, Tubeless Ready
Rear Wheel
Roval Alpinist CL II, 21mm internal width carbon rim, 33mm depth, Win Tunnel Engineered, DT for Roval 350 hub, DT Swiss Aerolite spokes, Tubeless Ready
Front Tire
S-Works Turbo 2BR, 700x28c
Rear Tire
S-Works Turbo 2BR, 700x28c
Inner Tubes
700x20-28, 48mm Presta Valve
Cockpit
Handlebars
S-Works Short & Shallow, 125mm drop, 75mm reach, w/ Di2 hole
Stem
Specialized Pro SL, alloy, 4-bolt
Seatpost
Roval Alpinist Carbon Seatpost
Saddle
Body Geometry Power Pro with Mirror, hollow titanium rails
Tape
Supacaz Super Sticky Kush
Shipping Policy
Components:
All component items (wheels, drivetrains, suspension, brakes, etc.) ship within 1–4 business days of purchase.
Bicycles:
Complete bikes typically ship within 2–3 weeks due to build, tuning, and inspection times. You will receive tracking information as soon as your order is ready to ship.
Riding Gear & Apparel:
Riding gear and apparel orders (helmets, jerseys, gloves, etc.) ship within 1–3 business days.
Returns & Exchanges:
If you received the wrong size or wish to exchange an item, it must be returned in original condition—unused, uninstalled, and with all packaging intact.
For full details, please see our Refund Policy before initiating a return.
