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Specialized Aethos Expert Ultegra Di2 Bicycle

The Specialized Aethos Expert Ultegra complete bikes feature a frameset that is step down in carbon grade from the ultra-light S-Works frame, but at 699 grams in a 54cm, it is hardly a heavyweight and is still as light nearly any other production frame made. Built here into the Aethos Expert Ultegra Di2 Bicycle, you will still be riding a bike that sits over 15lbs, and saves you serious money over the S-Works version. Although the Aethos design carries a race geometry, it was engineered and developed to offer the apex cycling experience for the serious enthusiast who appreciates the ultimate in quality and design, with the cleanest aesthetic, an incredible finish, and wondrous ride quality.

The story of the Aethos is pure Specialized. The achievement of the frameset design represents virtually all of the foundational principles of the company, except one. For one of the leading proponents of aerodynamic design for road cycling and racing, as exemplified by the Tarmac SL7, aerodynamics was never factored in to the development of the Aethos. Having struck the perfect balance between light weight and aerodynamics for the SL7 race machine, the engineering problem of building the lightest, most exceptional riding road bike was incredibly appealing. In order to crack it, new and more efficient applications of carbon fiber, as well as a new Continuous Curvature Design strategy were achieved. The end result of Aethos process pushed the most innovative team in cycling development to new heights and will certainly inform and impact the future. While the S-Works frame features the ultra-premium FACT 12r carbon, the Aethos Pro and Expert models have the more cost-effective FACT 10r layup.

The Aethos frame has been designed with the perfect combination of ultimate ride feel, light weight, and style. This was achieved by reinventing the traditional road tube shapes found on bikes of the past, subtly altering these visual shapes to deliver massive gains in stiffness and balance, all without affecting weight or durability. That visual story appears simple on some level, but it was the application of carbon technology and incredible engineering capabilities to find the stress loads, tube thicknesses, and how to best integrate all of the shapes and engineering requirements in ways you can't see to create the FACT 10r Aethos. This new process, with an entirely-new layup system tapped into the R&D system Specialized has perfected over multiple decades to be the most innovative company in cycling.

The creation and engineering story is ripe for a graduate course offering, so the discussion must turn the possibilities and rationale of the rider experience. A superlight frame is useless without confidence-inspiring ride characteristics, which is the team developed the Aethos to have the perfect balance of front and rear stiffness combined with exceptional overall ride quality. By studying the flexing and breathing of carbon fiber, the testers were able to discover groundbreaking findings about how forces flow through frames. With just a few firm pedal strokes you’ll realize this sublime ride sets a new standard. Every detail has been designed with style, weight, and durability in mind, everything required in pursuit for the perfect ride. The geometry is exceptionally close to that of the Tarmac SL7, with a few modifications that may add up to a subtle handling difference if you were comparing each bike built with the same exact kit.

The electronic shifting-only Aethos frameset is equipped with a 27.2mm round seatpost, the Roval Alpinist to be exact, which offers some engineered flex into the upper portion that adds to the frame compliance and weighs a scant 136 grams in the 300mm length. Not to worry, it (and the frameset) is rated for a rider weight up to 275lbs. The frame and fork can accommodate tires up to 32mm with 4mm of clearance on both sides. The fork steerer is round, accepting standard stem and bar set-ups. Every line, every junction just feels so economical and judicious in the use of materials. The subtleties are there, sometimes hidden by the amazing finish options, sometimes accentuated by them. Again, no real aero impact, as even the internal wiring set-up avoids the headtube integration mechanics quiver over. Still, the system is clean, simple, and looks totally inline with the Aethos concept. There isn't a single detail on the frame that has been overlooked. It is an amazing frameset: stunning, brilliant, and eminently rideable, which is truly the best part.

Shimano's Ultegra R8070 Di2 components deliver impeccable electronic shifting and all conditions disc braking with internal routing. Specialized, Roval and DT Swiss supply the kit, with Specialized alloy and stem, and Power Expert (hollow ti rails) saddle. Roval delivers the superlight Alpinist seatpost while DT R470 Disc alloy rims are laced to sealed bearing alloy hubs. The rims which carry the 700x26 S-Works Turbo 120 TPI clincher tires. The build is finished with an off-brand, but in the family- Supacaz Super Sticky Kush bar tape. This Aethos Expert build offers incredible value in a complete bike, with tremendous performance and a riding experience you'll long for before every ride.

Features

  • 15lb + complete pure road bike with Ultegra R8070 Di2, DT/Specialized disc wheelset
  • Superlight frameset engineered for a singular road cycling experience
  • Aethos FACT 10r Carbon frame, Rider First Engineered™, Electronic only, Flat Mount disc, 12/142mm thru-axle
  • Aethos FACT Carbon fork, tapered, headset, Flat Mount disc interface, 12/100mm thru-axle
  • Road race geometry, and race capable, but developed for the serious enthusiast who desires the lightest weight and exceptional ride characteristics, cleanest aesthetics
  • Perfect balance of front and rear stiffness combined with exceptional ride quality
  • Continuous Curvature Design strategy developed tubes with subtle, elongated conical sections deliver the highest stiffness-to-weight ratio ever tested
  • Max tire size: 700x32mm, with 4mm on either side
  • Designed for standard equipment: 27.2mm round post, standard stem-cockpit
  • Shimano Ultegra R8070 Di2 Hydraulic Disc Groupset
  • R8070 Di2 11spd: Dual Control levers, disc brake calipers, R8050 front/GS rear derailleurs, RT800 160mm FT/140mm RR disc rotors, R8000 Crankset 52-36T, CN701 chain, R8000 11-30 cassette
  • Specialized Kit: Expert Shallow Drop Bar (75mm reach, 123mm drop), Pro SL Alloy Stem, Power Expert Saddle, S-Works Turbo 120 TPI Clincher Tires, 700x26 w/Turbo tubes
  • Supacaz Super Sticky Kush bar tape
  • Roval Alpinist 27.2 Seatpost (12mm offset, 27.2mm x 300mm, 136 grams rated for 275lbs), machined 12/100mm, 12/42mm thru-axles)
  • Wheelset: DT Swiss R470 Disc rims/Specialized CL Disc sealed bearing hubs; 20mm IRW, 24mm ERW, 23mm profile
  • Component specifics by frame size
    • 49cm Bar width: 38c-c, Stem length: 80mm, Crank length: 165mm, Saddle width: 155m
    • 52cm Bar width: 40c-c, Stem length: 90mm, Crank length: 170mm, Saddle width: 155m
    • 54cm/56cm Bar width: 42c-c, Stem length: 100mm, Crank length: 172.5mm, Saddle width: 143mmm
    • 58cm/61cm Bar width: 44-c-c, Stem length: 110mm, Crank length: 175mm, Saddle width: 143mmm
  • Sizes: 49, 52, 54, 56, 58, 61 cm (49, 52 w/300mm long seatpost / 54, 56, 58, 61 w/360mm)
  • Colors: Gloss Ice Blue/Teal Tint/Flake Silver, Satin Red Tint/Dream Silver
  • Weight: 15.34 lbs (54cm)
Specialized Aethos
Size 49cm 52cm 54cm 56cm 58cm 61cm
Wheel Size 700 700 700 700 700 700
Stack 514mm 527mm 544mm 565mm 591mm 612mm
Reach 375mm 380mm 384mm 395mm 402mm 408mm
Head Angle 71.75° 72.5° 73° 73.5° 73.5° 74°
Seat Angle 75.5° 74° 74° 73.5° 73.5° 73°
Top Tube Length 508mm 531mm 540mm 562mm 577mm 595mm
Head Tube Length 109mm 120mm 137mm 157mm 184mm 204mm
Standover 705mm 728mm 744mm 769mm 796mm 824mm
Fork Trail 63mm 58mm 58mm 55mm 55mm 52mm
Fork Offset 47mm 47mm 44mm 44mm 44mm 44mm
Bottom Bracket Drop 74mm 74mm 72mm 72mm 72mm 72mm
Front Center 574mm 577mm 579mm 591mm 606mm 613mm
Wheelbase 973mm 975mm 978mm 991mm 1005mm 1012mm
Chainstay Length 410mm 410mm 410mm 410mm 410mm 410mm