2025 Specialized Aethos Comp Shimano 105 Di2 Road Bike

£4,250.00

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The 2025 Specialized Aethos Comp Shimano 105 Di2 Road Bike is designed simply for the love of riding. The Aethos is designed to straddle the line between perfect ride quality, extreme lightweight, and undeniable style.

The Aethos frame has been designed to handle everything from accelerating up steep pitches and descending technical descents, to all-day saddle comfort on even the longest coffee rides. By reinventing the traditional road shape found on bikes of the past, Specialized have delivered 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).

The Aethos Sport comes with modern Shimano 105 Di2 electronic shifting and hydraulic disc brakes paired with bomb-proof DT Swiss R470 Disc wheels, you have the perfect steed to excite you out on the road.

This bike is perfect for

Road riders who want a classic looking road bike that uses the latest tech to make one of the lightest, fastest and most fun road bikes on the market. With Di2 gearing you get clean shifts every time.

Key Features

  • Super lightweight Aethos FACT 9R Carbon frame
  • Shimano 105 Di2 electronic shifting and hydraulic disc brakes
  • Reliable DT Swiss R470 disc 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 9R Carbon, Rider First Engineered™, Threaded BB, 12x142mm thru-axle, flat-mount disc
Fork FACT Carbon, 12x100mm thru-axle, flat-mount disc
Crankset FC-R7100, 105, 12-Speed, Holllowtech 2
Chain Shimano SLX M7100, 12-speed w/ quick link
Cassette Shimano 105, 12-speed, 11-34t
Shift Levers Shimano 105 Di2 7170
Front Derailleur Shimano 105 Di2 7150, braze on
Rear Derailleur Shimano 105 Di2 7150
Front Brake Shimano 105 R7170, hydraulic disc
Rear Brake Shimano 105 R7170, hydraulic disc
Front Wheel DT R470 Disc
Rear Wheel DT R470 Disc
Front Tyre Turbo Pro, 700x28
Rear Tyre Turbo Pro, 700x28
Handlebars Specialized Shallow Drop, 6061, 70x125mm, 31.8mm clamp
Saddle Body Geometry Power Sport, steel rails
Seat Post Roval Alpinist Carbon Seatpost
Seat Binder Shimano 105 R7170, hydraulic disc
Inner Tubes Presta Valve Standard, 48mm valves
Chain Rings 50/34T
Bottom Bracket Shimano Threaded BSA BB
Stem Specialized Pro SL, alloy, 4-bolt
Tape SUPACAZ Super Sticky Kush
Colours Gloss Dune White / Metallic Spruce, Gloss Dusky Pink / Smoke
Sizes 49, 52, 54, 56, 58, 61
Brand Specialized
Model Year 2025
Barcodes 196625161322, 196625161469, 196625161582, 196625161667, 196625161681, 196625161759, 196625161766, 196625161780, 196625161810, 196625161872, 196625161919
SKUs / Part Numbers 97225-5049, 97225-5052, 97225-5054, 97225-5056, 97225-5058, 97225-5061, 97225-5149, 97225-5152, 97225-5154, 97225-5156, 97225-5158

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

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