Aethos Pro 2025 - Ultegra Di2 - Golden Sports Inc.

The Aethos line promises three things—exceptional light weight, perfectly-balanced ride characteristics, and undeniable style—and this Aethos pro is no exception. Aethos: Billions of calculations in the pursuit of one thing—the perfect ride.

Spec’d with Shimano's Ultegra Di2 that delivers clean, crisp shifts and Roval’s Alpinist wheels mated to DT Swiss 350 hubs and your left with a no-fuss build that delivers, mile after mile.

The Aethos frame has been designed with the perfect combination of ultimate ride feel, light weight, and style—from accelerating up steep pitches and descending technical descents, to all-day saddle comfort on even the longest coffee rides, the Aethos hits the mark. But how, you ask? By reinventing the traditional road shape found on bikes of the past, we’ve subtly altered these shapes to deliver massive gains in stiffness and balance, all without affecting weight or durability. Pair that with an entirely new layup and process that we’ve perfected over multiple decades and you have the lightest frame out there (585 grams, S-Works, size 56cm). The Aethos is more than just a new bike, it’s the first of a new breed.
A featherweight frame is useless without confidence-inspiring ride characteristics, which is why we’ve developed the Aethos to have the perfect balance of front and rear stiffness combined with exceptional ride quality. By studying the flexing and breathing of carbon fiber, we were able to discover groundbreaking findings about how forces flow through frames. Just a few pedal strokes and you’ll realize this sublime ride sets a new standard.
Every detail, from the derailleur hangers to the fork expander plug have been designed with style, weight, and durability in mind. We’ve also spec’d it with Roval’s all-new Alpinist carbon seatpost and wheels, further saving weight and improving ride characteristics. Everything in pursuit for the perfect ride

Technical Specifications

Frameset

Frame

Aethos FACT 10r Carbon, Rider First Engineered™, Threaded BB, 12x142mm thru-axle, flat-mount disc

Suspension

Fork

FACT Carbon, 12x100mm thru-axle, flat-mount disc

Brakes

Front Brake

Shimano Ultegra R8170, hydraulic disc

Rear Brake

Shimano Ultegra R8170, hydraulic disc

Drivetrain

Shift Levers

Shimano Ultegra Di2 R8170, hydraulic disc

Front Derailleur

Shimano Ultegra Di2 R8150, braze-on

Rear Derailleur

Shimano Ultegra Di2 R8150, 12-speed

Cassette

Shimano Ultegra, 12-speed, 11-30t

Chain

Shimano M8100, 12-speed w/ quick link

Crankset

Shimano Ultegra R8100 with 4iiiis Precision 3+ Power Meter

Chainrings

52/36T

Bottom Bracket

Shimano Threaded BSA BB

Wheels & Tires

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 Tire

S-works Turbo 2BR, 700x28mm

Rear Tire

S-works Turbo 2BR, 700x28mm

Inner Tubes

700x20-28, 48mm Presta Valve

Cockpit

Tape

Supacaz Super Sticky Kush

Stem

Specialized Pro SL, alloy, 4-bolt

Handlebars

S-Works Short & Shallow, 125mm Drop, 75mm Reach w/Di2 Hole

Saddle

Body Geometry Power Pro with Mirror, hollow titanium rails

SeatPost

Roval Alpinist Carbon Seatpost

Seat Binder

Specialized Alloy, 30mm

Product Details

Product ID

221544

Weight

6.78kg (14 lb, 15.2 oz)

Weight Size

* Weights based on production painted frames as pictured. Actual weights will vary based on colorway, frame size, and component variation. Specifications are subject to change without notice.

Geometry

	49	52	54	56	58	61
Crank Length	165mm	170mm	172.5mm	172.5mm	175mm	175mm
Handlebar Width	380mm	400mm	420mm	420mm	440mm	440mm
Stem Length	80mm	90mm	100mm	100mm	110mm	110mm
Saddle Width	155mm	155mm	143mm	143mm	143mm	143mm
Seatpost Length	300mm	300mm	360mm	360mm	360mm	360mm
Stack	514mm	527mm	544mm	565mm	591mm	612mm
Reach	375mm	380mm	384mm	395mm	402mm	408mm
Head Tube Length	109mm	120mm	137mm	157mm	184mm	204mm
Head Tube Angle	71.75°	72.5°	73°	73.5°	73.5°	74°
BB Height	266mm	266mm	268mm	268mm	268mm	268mm
BB Drop	74mm	74mm	72mm	72mm	72mm	72mm
Trail	58mm	55mm	55mm	52mm	63mm	58mm
Fork Length, Full	369mm	369mm	369mm	369mm	369mm	369mm
Fork Rake/Offset	47mm	47mm	44mm	44mm	44mm	44mm
Front Center	574mm	577mm	579mm	591mm	606mm	613mm
Chainstay Length	410mm	410mm	410mm	410mm	410mm	410mm
Wheelbase	973mm	975mm	978mm	991mm	1005mm	1012mm
Top Tube Length, Horizontal	508mm	531mm	540mm	562mm	577mm	595mm
Bike Standover Height	705mm	728mm	748mm	769mm	796mm	824mm
Seat Tube Length	431mm	462mm	481mm	504mm	532mm	567mm
Seat Tube Angle	75.5°	74°	74°	73.5°	73.5°	73°