Specialized S-Works Aethos 2 Bicycle – lightness at the service of passion
"Break the Rules" – Break the rules, ride with joy
With a frame weighing only 595 g, the S-Works Aethos 2 is the lightest production racing frame in the world. But its true value is not just in the weight: designed to "disappear beneath you," this bike offers an incredibly responsive, supple, and sublime ride. Thanks to greater tire compatibility, refined components, and improved geometry based on data, the Aethos 2 brings the extreme riding experience to a wider audience. Break the rules… for the love of riding.
Main features
Use: Performance Road Riding
Frameset: 595 g FACT 12r (frame) / FACT 12r (fork)
Fit: Performance Endurance
Cockpit & Wheels: Roval Alpinist Integrated Cockpit II + Roval CLX III wheels
Groupset: Shimano DuraAce Di2
Total weight: 6.05 kg (size 56 cm)
Technical specifications
Frame
Specialized S-Works Aethos 2 in FACT 12r Carbon fiber, Rider First Engineered™ technology
Threaded bottom bracket (Threaded BB), hidden internal cable routing (hidden routing)
Flat-mount disc brake mounts, rear thru-axle 12×142 mm
Fork
Brakes
Front: Shimano Dura-Ace BR-R9270, hydraulic
Rear: Shimano Dura-Ace BR-R9270, hydraulic
Drivetrain
Crankset: Shimano Dura-Ace R9200 HollowTech II, 12 speed + power meter 4iiii Precision Pro (52/36t)
Rear derailleur: Shimano Dura-Ace Di2 R9250 (12-speed)
Front derailleur: Shimano Dura-Ace Di2 R9250, braze-on version
Shift/brake levers: Shimano Dura-Ace Di2 R9270, with hydraulic brakes
Cassette: Shimano Dura-Ace 12-speed, 11-30t
Bottom Bracket: Shimano Dura-Ace BB-R9100
Chain: Shimano XTR M9100 12-speed with quick link system
Wheels and tires
Inner tubes: 700×2535 mm, 50 mm Presta valve (TPU)
Tires: S-Works Turbo TLR Race 700×28c (front and rear)
Front wheel: Roval Alpinist CLX III tubeless, 33 mm deep carbon rim, 26.5 mm external width / 21 mm internal; Roval LF21-F 21H hub with Sinc ceramic bearings
Rear wheel: Roval Alpinist CLX III tubeless, 33 mm deep carbon rim, 26.5 mm external width / 21 mm internal; Roval LF19-R 24H hub with Sinc ceramic bearings
Spokes: Roval aero composite by ARRIS with titanium nipples
Handlebar / seatpost / saddle components
Handlebar / stem: Roval Alpinist Cockpit II integrated
Seatpost: Roval Alpinist carbon, with lightweight collar
Saddle: S-Works Power with Mirror technology
Seat clamp (Seat Binder): Specialized alloy 30.0 mm with titanium bolt
Handlebar tape: Supacaz Super Sticky Kush
Other details
Note Well
Technical specifications may change without notice depending on component availability.
The product images are purely indicative and may not exactly reflect the described features.
Choose the S-Works Aethos 2 to reach new levels of road performance: lightness, precision, and technology at the service of your passion for cycling.
Do you want to receive your bike ready for use? Don't forget to add the bike assembly service at the time of purchase! Discover all the details here: Francesconi bike assembly
A Complete Guide to Bike Sizes
Foreword: Not all bike sizes are the same
Each type of bike has a specific frame and often uses a different size scale. For example, a road bike with a 54cm frame might be considered a medium size by one brand, but a large by another.
Bicycle adjustment margins
Some types of bikes, like gravel bikes, offer a wide range of adjustments, adapting to different body types. Other models, however, have limitations in this regard. This is an important aspect to consider.
How to use size charts
We've created a simple guide to help you find the right bike size:
- Check out our size charts for each bike type.
- Learn more with specific tips to help you make the right choice.
Size Charts: Find Your Perfect Bike
Gravel and road bikes
Sizes are based on the length of the top tube (in cm), which determines the reach of the bike.
| Cut
|
Recommended height
|
Horizontal tube length
|
| XS |
Up to 157 cm |
48-50 cm |
| S |
157-167 cm |
50-53 cm |
| M |
168-178 cm |
53-56 cm |
| THE |
178-185 cm |
56-58 cm |
| XL |
Over 185cm |
58-62 cm |
For gravel, measurements may vary slightly due to different geometries, but remain similar.
Mountain bike
MTBs are measured in inches, based on the seat tube.
| Cut
|
Recommended height
|
Size (in inches)
|
| XS |
Up to 157 cm |
14"-16" |
| S |
157-167 cm |
15"-17" |
| M |
168-178 cm |
16"-19" |
| THE |
178-185 cm |
18"-20" |
| XL |
Over 185cm |
20"-23" |
Sizes also vary depending on the type of MTB: full-suspension , hardtail or fat bike .
Children's bikes
The size depends on the size of the wheels, often associated with age:
| Age
|
Wheel Size
|
| 1-3 years |
12" |
| 2-4 years |
14" |
| 4-6 years |
16" |
| 5-8 years |
20" |
| 8-10 years |
24" |
| Over 10 years |
26"/27.5" |
What to do with half measures?
If you are between two sizes:
-
Comfort : Choose the larger size.
-
Performance : Go for the smaller size.
Final tips for choosing
-
Consult the manufacturer's instructions : Always check the brand's guidelines.
-
Ask an expert : a specialized workshop can help you choose based on your height, ideal reach and goals.
-
Test the bike : If possible, test the model you intend to purchase.
