2024 Specialized Aethos Pro Ultegra Di2 Road Bike


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The 2024 Specialized Aethos Pro Ultegra Di2 Road Bike promises three things—exceptional light weight, perfectly-balanced ride characteristics, and undeniable style.

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. Specialized have subtly altered traditional road frame shapes to deliver massive gains in stiffness and balance, all without affecting weight or durability. Pair that with an entirely new carbon layup and process and you have the lightest frame out there (585 grams, S-Works, size 56cm).

A featherweight frame is useless without confidence-inspiring ride characteristics, which is why Specialized developed the Aethos to have the perfect balance of front and rear stiffness combined with exceptional ride quality. Just a few pedal strokes and you’ll realize this sublime ride sets a new standard.

The Aethos Pro comes with Shimano's Ultegra Di2 that delivers clean, crisp shifts and Roval’s Alpinist wheels mated to DT Swiss 350 hubs. You are left with a no-fuss build that delivers, mile after mile.

This bike is perfect for

Road cyclists who want a classic looking lightweight road bike that they can ride all day. With the Ultegra Di2 groupset you get the latest tech as well.

Key Features
  • Super lightweight FACT 10r Carbon frame
  • Shimano Ultegra Di2 12 speed electronic gearing
  • Specialized Roval Alpinist lightweight carbon wheels

Guide To Road Bike Gears

If you are buying a road bike one of the big differences between models will be which gears they use. Most manufacturers will make the same bike, using the same frame but putting different gears and wheels on it. So for instance you can buy a Trek Domane AL 2 Disc with Shimano Claris gearing for £975 or get the Trek Domane AL 4 Disc with Tiagra gearing for £1625. They are fundamentally the same bike. One comes with the Shimano Tiagra gears and the other comes with Shimano Claris gears.

In most cases, the bottom of the range gears and top of the range gears will basically work in the same way. The big differences are in the quality of material used and the weight. Top of the range gears will be lighter and smoother to use.

One thing to watch out for when comparing bikes is whether the full groupset is being used. If you are buying a bike that has Shimano 105 gears on it. Shimano makes 105 brakes, gear levers, front and rear derailleurs, cranks, chainrings and bottom brackets. So basically all of the running gear on the bike. Some bike manufacturers will fit the full groupset, others will fit Shimano 105 front and rear derailleurs but use their own brakes and cranks to save a few pounds. So if you are comparing bikes be sure to check how much of the groupset the bike actually uses.

Read our Guide to Road Bike Gears

Road Bike Buying Guide

Nothing beats the feeling of effortless speed you get on a road bike. There are lots of reasons to ride a road bike, from the simple joy of it, to racing, long distance challenges, or café rides with friends. Whatever you want to do there will be road bike out there for you.

Men’s and Women’s road bikes

Nearly all manufacturers have stopped making dedicated men’s and women’s bikes. They are now all unisex. What you will see is that on smaller bikes, brands will often fit a wider saddle (generally more female friendly). On larger bikes they will often fit a narrower one (generally more male friendly).

Disc or rim brakes

It is getting increasingly hard to buy new bikes with rim brakes as the industry has almost exclusively switched to discs. The reasons for this are pretty simple. Disc brakes are much, much, more powerful than old rim brake systems so you can stop a lot more easily and safely. Disc brakes also allow much bigger tyres to be fitted which is more comfortable. Older disc brake systems did often suffer from rubbing and squeaking. While this hasn’t been completely fixed yet it is much less common on modern bikes with hydraulic brakes. Mechanical disc brakes can still take a bit of fettling to get them right so go for hydraulic if you can.

Read our full road bike buying guide

Who are Specialized?

Specialized is one of the best-known quality bike brands in the world. Started by a group of riders in 1974. A fact which has guided their decision making ever since.

" Made for riders, by riders."

They strove to make the best quality tires when quality tyres weren't around. When people wanted to ride cruisers in the dirt, they made the first production mountain bike. When roadies wanted to go faster, Specialized doubled down on carbon and built their own wind tunnel.

Bikes like the Allez, Rockhopper and Stumpjumper have developed followings and reputations of their own. Specialized has a reputation for making high-end, high-quality bikes. Specialized bikes always look great with high-quality paint and sensible sizing hel0s you get the right bike each time. If you buy a Specialized bike you can be guaranteed it will do what it is supposed to and will last.

Find our more about Specialized bikes

Price Match at Cycles uk

We understand that price is important, so we regularly price-check our competitors to make sure we have the best offers available. We recognise that we will not always be the cheapest, so if you see the same product cheaper from any of our competitors then please get in touch via the form below and we will do our best to match any reasonable advertised price.

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

Saddle - Body Geometry Power Pro, hollow titanium rails

SeatPost - Roval Alpinist Carbon Seatpost

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

Seat Binder - Specialized Alloy, 30mm

Stem - Specialized Pro SL, alloy, 4-bolt

Tape - Supacaz Super Sticky Kush

Front Brake - Shimano Ultegra R8170, hydraulic disc

Rear Brake - Shimano Ultegra R8170, hydraulic disc

Chainrings - 52/36T

Cassette - Shimano Ultegra, 12-speed, 11-30t

Bottom Bracket - Shimano Threaded BSA BB

Rear Derailleur - Shimano Ultegra Di2 R8150, 12-speed

Crankset - Shimano Ultegra R8100 with 4iiiis Power Meter

Front Derailleur - Shimano Ultegra Di2 R8150, braze-on

Shift Levers - Shimano Ultegra Di2 R8170, hydraulic disc

Chain - Shimano M8100, 12-speed w/ quick link

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

Inner Tubes - 700x20-28, 48mm Presta Valve

Front Tyre - S-works Turbo 2BR, 700x28mm

Rear Tyre - S-works Turbo 2BR, 700x28mm

Weight - Size 56 - 6.78kg (14 lb, 15.2 oz)

Sizes 52, 54, 56
Brand Specialized
Model Year 2024
Barcodes 888818963676, 888818963874, 888818963911, 888818964079, 888818964253, 888818964260
SKUs / Part Numbers 97224-1052, 97224-1054, 97224-1056, 97224-1152, 97224-1154, 97224-1156

Please note: Manufacturers can sometimes change the specification of the products from time to time.

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