Specialized S-Works Aethos 2 54 *Contender Custom*
Product Details
The Specialized S-Works Aethos 2 Contender Custom Build is centered around the lightest production road frame in the world, built to deliver impossibly responsive, supple, and sublime riding that transcends traditional performance metrics. With a groundbreaking 595-gram frame (705g in FACT 10r), this bike was never just about weight, it breaks racing's rules to deliver pure road riding bliss, engineered to disappear beneath riders with a ride quality closer to perfect than anything that came before.
Built using revolutionary Flow State Design, the Aethos 2 emerged from a moment of human insight when Specialized engineers noticed frames "breathe" under load. That subtle rhythm revealed how force moves through structure, becoming data fed into supercomputers along with decades of real-world testing. The result evolved traditional round tubes into precisely sculpted forms where shape itself delivers stiffness, eliminating traditional carbon layup layers while improving structural integrity.
Refined geometry using data from over 100,000 Body Geometry fits makes long mountain days feel even better. The stack increased by 15mm to reduce pressure on hands, neck, and shoulders, while a 7mm longer wheelbase provides confidence-inspiring stability on descents. A 0.5° slacker head tube creates nimble yet intuitive handling that feels telepathic. Aethos 2 clears 35mm tires with ease, delivering smoother, faster rides with more grip and versatility, all without compromising the obsessive weight optimization that defines every detail.
Perfect for riders seeking the ultimate expression of ride feel and simplicity, this Contender Custom Aethos pairs the transcendent frameset with Shimano Dura-Ace Di2 2x12 wireless shifting and the ENVE SES 2.3 wheelset. This is the bike that redefined how Specialized builds everything, making superlight builds a reality while delivering Flow State on every ride.
Key Features
- Frame - Specialized S-Works Aethos 2 FACT 12r
- Drivetrain - Shimano Dura-Ace Di2 2x12
- Wheelset - ENVE SES 2.3
| Specification | Detail |
|---|---|
| Frame | Specialized S-Works Aethos 2 Frameset Satin Black Ink Wash / Pearl / Shadow Silver 54 |
| Cockpit | Specialized Roval Rapide Road Cockpit Carbon / Black 31.8 x 420 / 110mm |
| Wheelset | ENVE SES 2.3 100/142 CL Wheelset Shimano 11/12 |
| Shifters | Shimano Dura-Ace ST-R9270-R Di2 Shift/Brake Levers |
| Brakes | Shimano Dura-Ace BR-R9270 Hydraulic Disc Brake Caliper - Flat Mount Resin Brake Pads |
| Crankset | Shimano Dura-Ace Crankset, FC-R9200 12-Speed 172.5mm 50-34t |
| Front Derailleur | Shimano Dura Ace FD-R9250 12s Braze On Front Derailleur |
| Cassette | Shimano Dura-Ace CS-R9200 Cassette - 12-Speed 11-30t |
| Bottom Bracket | Shimano Dura-Ace R9100 Hollowtech II Bottom Bracket English |
| Rear Derailleur | Shimano Dura-Ace RD-R9250 Di2 Rear Derailleur - 12-Speed Medium Cage Black |
| Chain | Shimano XTR CN-M9100 12-Speed Chain with Quick-Link, 126 Links |
| Saddle | Specialized Power Comp Mimic Saddle Black 143mm |
| Tire | ENVE SES Tubeless Tire Black 29mm |
| Measurement | 49 | 52 | 54 | 56 | 58 | 61 |
|---|---|---|---|---|---|---|
| Crank Length | 165 mm | 170 mm | 172.5 mm | 172.5 mm | 175 mm | 175 mm |
| Handlebar Width | 380 mm | 380 mm | 400 mm | 400 mm | 420 mm | 420 mm |
| Stem Length | 80 mm | 90 mm | 100 mm | 100 mm | 110 mm | 110 mm |
| Saddle Width | 155 mm | 155 mm | 143 mm | 143 mm | 143 mm | 143 mm |
| Seatpost Length | 300 mm | 300 mm | 360 mm | 360 mm | 360 mm | 360 mm |
| Stack | 522 mm | 538 mm | 559 mm | 580 mm | 606 mm | 627 mm |
| Reach | 373 mm | 377 mm | 384 mm | 391 mm | 398 mm | 404 mm |
| Head Tube Length | 114 mm | 128 mm | 150 mm | 169 mm | 198 mm | 218 mm |
| Head Tube Angle | 71.4° | 72.1° | 72.5° | 73° | 73° | 73.5° |
| BB Height | 265.5 mm | 265.5 mm | 267 mm | 267 mm | 268.5 mm | 268.5 mm |
| BB Drop | 76.5 mm | 76.5 mm | 75 mm | 75 mm | 73.5 mm | 73.5 mm |
| Trail | 62 mm | 58 mm | 55 mm | 55 mm | 55 mm | 52 mm |
| Fork Length, Full | 372 mm | 372 mm | 372 mm | 372 mm | 372 mm | 372 mm |
| Fork Rake / Offset | 50 mm | 50 mm | 50 mm | 47 mm | 47 mm | 47 mm |
| Front Center | 581 mm | 584 mm | 594 mm | 599 mm | 614 mm | 621 mm |
| Chainstay Length | 410 mm | 410 mm | 410 mm | 410 mm | 410 mm | 410 mm |
| Wheelbase | 978 mm | 981 mm | 992 mm | 998 mm | 1013 mm | 1020 mm |
| Top Tube Length, Horizontal | 508 mm | 526 mm | 544 mm | 557 mm | 572 mm | 584 mm |
| Bike Standover Height | 719 mm | 737 mm | 759 mm | 779 mm | 805 mm | 834 mm |
| Seat Tube Length | 450 mm | 470 mm | 490 mm | 510 mm | 535 mm | 570 mm |
| Seat Tube Angle | 75.5° | 74.5° | 74° | 74° | 74° | 74° |