Specialized Aethos Comp

“Beneath the retro looks is a bike that’s on the cutting-edge”

The S-Works Aethos frame is built from Specialized’s highest-grade FACT (Functional Advanced Composite Technology) 12r carbon, whereas the Aethos Comp is made from lower-spec 10r carbon but uses the same moulds as the S-Works. It weighs in at a mere 699g, so is still one of the lightest production frames you can buy. It carries less weight than Colnago’s 790g Tour-winning V3Rs, Cannondale’s 866g SuperSix EVO and Specialized’s 800g Tarmac SL7.

The Aethos Comp’s slender, round tube profiles and traditional shape (no dropped seatstays here) give the frame a retro flavour, and its apparent disregard for aerodynamics seems at odds with Specialized’s commitment to reducing drag. But make no mistake, beneath its retro looks and understated finish, this is a bike that’s on the cutting-edge.

RIVAL SONS

Both the Aethos Comp and the Colnago V3 come with SRAM’s 12-speed Rival eTap AXS, which is SRAM’s most affordable wireless electronic groupset. It uses the same electronic brain, the same motors and the same transmission technology as the higher tier eTap groupsets (all of which are accessible and tuneable through SRAM’s excellent AXS app) while using less exotic materials to bring the price down.

The shift logic of AXS is simple: push the right button to move down the cassette, push the left button to move up it, and push both buttons together to shift between chainrings. Shifts are just as quick as they are with Red and Force groupsets, and chain security over poorer surfaces is impressive too (the rear mech has a spring clutch that keeps the chain taut to prevent it from bouncing around).

Pair it with SRAM’s AXS app and you can record pretty much every metric you could want: speed (current, average and max), distance, trip time. There’s also full GPS tracking and heart rate, if you pair it with an HRM. The app also lets you adjust settings, from how many gears it’ll shift with a prolonged button press to full auto, which sees AXS automatically shift the front mech as you move through the 12-speed cassette on the rear.

Both bikes in this test came equipped with 48/35 chainrings (pretty much the equivalent of a 52/36 ‘pro-compact’ setup), although Specialized has given the Aethos a 10-36 cassette (equivalent to an 11-speed 11-34) while Colnago has gone for a closer ratio 10-30 cassette.

The Aethos’s wider-range cassette means you get single-tooth jumps between the top four sprockets (10, 11, 12, 13), with two-tooth jumps for the next four (15, 17, 19, 21) before finishing off with three- and four-tooth jumps (24, 28, 32, 36). Even with the gaps, it’s still feels nicely progressive and the 35 x 36 bottom gear is more than ample for even the harshest climbs.

CLIMBING PROWESS

So, just how does this ‘regular’ Aethos stack up against the Colnago V3 its being tested against here? Not to mention its £11,750 S-Works stablemate? The answer: rather well. While we were blown away by the climbing prowess of the S-Works

Aethos (as you might expect with a 58cm bike weighing just 6.38kg), its stiffness made it skittish on descents and poor road surfaces. The Aethos Comp, however, is much better when it comes to descending – the chassis is more composed and the front end transmits much less buzz, even with an alloy bar, budget wheels and skinny tyres. In this guise the Aethos feels composed, balanced and more confidence-inspiring.

The bike responds to your pedalling input with plenty of spark and, even though its 1,670g wheels and modest tyres don’t exactly shout ‘climber’, it climbs as well as bikes that are a kilo lighter. In spite of the modest wheels you can feel the low weight of the frame, which helps to give it a beautifully nimble feel. Swapping out the wheels for a 500g lighter pair of Zipp 303 Firecrests elevated the Aethos Comp to a machine that could beat a superbike up climbs.

It may have been designed not to comply with the UCI weight limit, but this Aethos still gets the ‘full-fat’ race geometry. The 58cm test bike has a low 591mm stack and a long 402mm reach. Add a tight wheelbase, a smidge over a metre, and a short, 55mm trail (shorter than those of Cannondale’s SuperSix EVO and Specialized’s own Tarmac SL7 pro machine) and you’ve got a nimble, fast-handling machine. Combine those numbers with the lightweight chassis and this is a bike you can flick in an instant to avoid potholes, ruts or other hazards with ease.

A LOT TO LOVE

It’s a bit of a mixed bag when it comes to the Aethos’s contact points. The short

Power saddle is great even in its near300g Sport version (rather than the 160g model the S-Works bike gets). The alloy bar has a smartly shaped, compact drop that’s easy to get down into but is quite slender, especially the tops, which feel narrower compared to the latest flattened, ovalised designs. The bar is wrapped with SupaCaz’s excellent tape, though, which is sticky, compliant, durable and a well-cushioned alternative to the skinnier, cheaper tapes found on a lot of bikes.

There’s a lot to love on Specialized’s Aethos Comp, which we think is much better value than its S-Works sibling. Its handling is lightning fast, it absorbs road buzz better than the S-Works model and is more composed over poor road surfaces as a result. The Aethos Comp’s understated looks will appeal to many, its SRAM wireless shifting worked impeccably, and the frame is one of the lightest you can buy. We just would’ve appreciated a set of wheels that would really made the most of its super-light frame. But that’s true of a lot of bikes, even at this lofty price point.