To improve your shopping experience today and in the future, this site uses cookies.
I Accept Cookies
Shop the Specialized Aethos Pro Shimano Ultegra Di2 road bike. Ultra-light carbon frame, precision Di2 electronic shifting, Roval Alpinist wheels, and ultimate performance for climbing, descending, and endurance rides.
Shop the Specialized Aethos Pro Shimano Ultegra Di2 road bike. Ultra-light carbon frame, precision Di2 electronic shifting, Roval Alpinist wheels, and ultimate performance for climbing, descending, and endurance rides.
Specialized

2025 Specialized Aethos Pro Shimano Ultegra Di2 Road Bike - Carbon - 52cm

£5,899.00 £8,000.00 26% off
Pre-Order

With Pre-Order, you can purchase the latest items added to our store in advance of them arriving with us.

Your Pre-Order is prioritised (at no additional charge); meaning that as soon as the product arrives with us, we can wrap it straight back up; ready for collection via Click & Collect or despatch to you — it often never even hits the stock room shelves!

Pre-Launch

With Pre-Launch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Pre-Orders.

So, instead, you can submit your email address against the item you are interested in and we will email you as soon as stock arrives on the system.

Estimated Delivery & Collection Dates

Estimated Delivery & Collection Dates are given on Pre-Order and Pre-Launch products. They are for indication purposes only and can change at any time without notice.

The dates we provide are based on indications given by our suppliers. Whenever we get updated information from our suppliers we will endeavour to update the Estimated Delivery & Collection Dates provided on product pages.

We estimate this will be ready for despatch to you or collection via Click & Collect on Undetermined

2025 Specialized Aethos Pro Shimano Ultegra Di2 Road Bike - Carbon - 52cm

Season:2025

Brand:Specialized

Code:42215445440777

The Specialized Aethos Pro is the ultimate lightweight road bike engineered for performance, ride quality, and style. Designed for competitive cyclists and endurance riders, the Aethos Pro combines an ultra-light carbon frame with perfectly-balanced stiffness and handling, delivering exceptional control whether climbing steep hills, descending technical roads, or enjoying all-day rides.

Spec’d with Shimano Ultegra Di2 electronic shifting, the Aethos Pro offers precise, reliable, and crisp gear changes for smooth performance across any terrain. The bike features Roval Alpinist carbon wheels paired with DT Swiss 350 hubs, providing a lightweight, responsive wheelset that enhances speed, efficiency, and ride comfort. With advanced carbon layup and frame engineering, the Aethos Pro achieves unparalleled stiffness-to-weight ratios without sacrificing durability.

Every detail, from the derailleur hangers to the integrated fork expander plug, is optimised for road cycling performance, style, and reliability. The Roval Alpinist carbon seatpost further improves ride characteristics, reducing weight while maintaining comfort and control. For riders seeking a premium road bike that combines ultra-lightweight construction, Shimano Ultegra Di2 precision, and aerodynamic efficiency, the Aethos Pro is in a class of its own.

Up your game and start enjoying more rides whether you're circling round the Island Route across the Isle of Wight or getting your caffeine fix from Walthamstow's Epping Forest, Toot Hill and Ethos Coffee loop.


Shimano Ultegra Di2

Shimano Ultegra Di2 is a premium electronic road bike groupset designed for precision, speed, and reliability. Featuring wireless or wired electronic shifting, Ultegra Di2 delivers crisp, accurate gear changes with minimal effort, perfect for road cycling, endurance rides, and competitive racing. With lightweight construction, smooth braking with hydraulic disc compatibility, and long-lasting durability, Shimano Ultegra Di2 provides riders with ultimate control, efficiency, and performance on any terrain. Upgrade your bike with Shimano Ultegra Di2 components for seamless shifting, enhanced cadence management, and optimized road bike performance.

Technical Information
  • 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
  • HANDLEBARS
    S-Works Short & Shallow, 125mm Drop, 75mm Reach w/Di2 Hole
  • STEM
    Specialized Pro SL, alloy, 4-bolt
  • TAPE
    Supacaz Super Sticky Kush
  • SADDLE
    Body Geometry Power Pro with Mirror, hollow titanium rails
  • SEATPOST
    Roval Alpinist Carbon Seatpost
  • SEAT BINDER
    Specialized Alloy, 30mm
  • FRONT BRAKE
    Shimano Ultegra R8170, hydraulic disc
  • REAR BRAKE
    Shimano Ultegra R8170, hydraulic disc
  • FRONT DERAILLEUR
    Shimano Ultegra Di2 R8150, braze-on
  • REAR DERAILLEUR
    Shimano Ultegra Di2 R8150, 12-speed
  • CRANKSET
    Shimano Ultegra R8100 with 4iiiis Precision 3+ Power Meter
  • CHAIN
    Shimano M8100, 12-speed w/ quick link
  • CASSETTE
    Shimano Ultegra, 12-speed, 11-30t
  • BOTTOM BRACKET
    Shimano Threaded BSA BB
  • SHIFT LEVERS
    Shimano Ultegra Di2 R8170, hydraulic disc
  • CHAINRINGS
    52/36T
  • 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 TYRE
    S-works Turbo 2BR, 700x28mm
  • REAR TYRE
    S-works Turbo 2BR, 700x28mm
  • INNER TUBES
    700x20-28, 48mm Presta Valve
  • WEIGHT
    6.78kg (14 lb, 15.2 oz)
  • WEIGHT SIZE
    56cm
As with any product, specification is subject to change without prior notification. You are advised to confirm current specification before buying. Please note that this bike does not come with pedals.
Sizing Information

SIZING

Size in ft5'1" - 5'4"5'4" - 5'7"5'7" - 5'9"5'9" - 5'11"5'11" - 6'2"6'2" - 6'5"
Size in cm155 - 163cm163 - 170cm170- 175cm175 - 180cm180 - 188cm188 - 196cm
Bike Size495254565861

GEOMETRY

Size49cm52cm54cm56cm58cm61cm
BB Drop74mm74mm72mm72mm72mm72mm
BB Height266mm266mm268mm268mm268mm268mm
Bike Standover Height705mm728mm748mm769mm796mm824mm
Chainstay Length410mm410mm410mm410mm410mm410mm
Fork Length, Full369mm369mm369mm369mm369mm369mm
Fork Rake/Offset47mm47mm44mm44mm44mm44mm
Front Centre574mm577mm579mm591mm606mm613mm
Head Tube Angle71.75°72.5°73°73.5°73.5°74°
Head Tube Length109mm120mm137mm157mm184mm204mm
Reach375mm380mm384mm395mm402mm408mm
Seat Tube Angle75.5°74°74°73.5°73.5°73°
Seat Tube Length431mm462mm481mm504mm532mm567mm
Stack514mm527mm544mm565mm591mm612mm
Top Tube Length, Horizontal508mm531mm540mm562mm577mm595mm
Trail58mm55mm55mm52mm63mm58mm
Wheelbase973mm975mm978mm991mm1005mm1012mm
Crank Length165mm170mm172.5mm172.5mm175mm175mm
Handlebar Width380mm400mm420mm420mm440mm440mm
Stem Length80mm90mm100mm100mm110mm110mm
Saddle Width155mm155mm143mm143mm143mm143mm
Seatpost Length300mm300mm360mm360mm360mm360mm
Professional Opinion
Home Road Cycling Bikes Specialized Road Bikes