Specialized Aethos 105 Di2 Road Bike 2025
With 46 years of rider-focused experience, we present the Aethos—a bike crafted solely for the love of riding. This model is designed to skillfully balance perfect ride quality, extreme lightweight, and undeniable style, exemplified by the Aethos Comp.
The Aethos frame embodies the pinnacle of riding experience, seamlessly combining ultimate ride feel, lightness, and style. Through innovative redesign, we've altered traditional road shapes, achieving significant gains in stiffness and balance without compromising weight or durability. With a groundbreaking layup process perfected over decades, the Aethos road bike boasts the lightest frame available (585 grams, S-Works, size 56cm), marking the dawn of a new era in biking. It's not just a new bike; it's the inception of a new breed.
A featherweight frame is meaningful when paired with confidence-inspiring ride characteristics—a balance of front and rear stiffness, coupled with exceptional ride quality. Our meticulous study of carbon fiber flex and breathing has led to groundbreaking insights, setting a new standard in sublime rides. Every detail, from derailleur hangers to the fork expander plug, reflects our commitment to style, weight, and durability. The inclusion of Roval’s all-new Alpinist carbon seatpost further enhances weight savings and ride attributes, emphasizing our relentless pursuit of the perfect ride.
Technical Specification
| Frame | Aethos FACT 9R Carbon, Rider First EngineeredTM, Threaded BB, 12x142mm thru-axle, flat-mount disc |
| Fork | FACT Carbon, 12x100mm thru-axle, flat-mount disc |
| Handlebars | Specialized Shallow Drop, 6061, 70x125mm, 31.8mm clamp |
| Stem | Specialized Pro SL, alloy, 4-bolt |
| Tape | Roubaix S-Wrap |
| Saddle | Body Geometry Power Sport, steel rails |
| Seatpost | Roval Alpinist Carbon Seatpost |
| Front Brake | Shimano 105, Hydraulic disc |
| Seat Binder | Shimano 105 R7170, hydraulic disc |
| Rear Brake | Shimano 105 R7170, hydraulic disc |
| Shift Levers | Shimano 105 Di2 7170 |
| Front Derailleur | Shimano 105 Di2 7150, braze on |
| Rear Derailleur | Shimano 105 Di2 7150 |
| Cassette | Shimano 105, 12-speed, 11-34t |
| Chain | Shimano SLX M7100, 12-speed w/ quick link |
| Crankset | FC-R7100, 105, 12-Speed, Holllowtech 2 |
| Chainrings | 50/34T |
| Bottom Bracket | Shimano Threaded BSA BB |
| Front Wheel | DT R470 Disc |
| Rear Wheel | DT R470 Disc |
| Front Tire | Turbo Pro, 700x28 |
| Rear Tire | Turbo Pro, 700x28 |
| Inner Tubes | Presta Valve Standard, 48mm valves |
| Weight | 7.5 kg (16 lb, 8.6 oz) |
| Weight Size | 56 |
Built, Checked, Tuned and Tested
All our bikes are fully built, checked, tuned and tested by our Cytech qualified mechanics and then securely packaged, ready for delivery. All you have to do is add the pedals (if included), attach the handlebars to the stem and tighten them following the included detailed instructions or by watching our video and using the provided FREE tools. Visit our Bike Assembly page to see how you assemble your new bike once you receive it.
All bikes collected from our shop, are built, tested and ready to ride. For hassle-free home delivery and bike set-up from a qualified mechanic use our Premier Delivery Service.
Please note, occasionally, manufacturers may change the specification without notice. Bicycles do not come with pedals unless otherwise specified. Bikes ordered for delivery will not arrive with the pedals installed, please refer to the owners manual and pedal installation guides provided for guidance. We do not install accessories to bikes, including mudguards. Bikes ordered for delivery that have tubeless compatible tyres and rims will arrive with inner tubes installed or with tubeless valves installed, this will be brand dependent. Sealant is available to be purchased separately.
If you require any assistance please contact our Customer Care team.
Specialized Aethos Comp 105 Di2 Road Bike 2025 Sizing
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Why buy your bike from Sigma Sports?
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