Aethos S-Works 2

The Aethos 2 lineup spans three tiers, all utilizing electronic drivetrains, threaded BSA bottom brackets, and the SRAM UDH standard. The flagship S-Works models feature the lightest FACT 12r carbon frame, CeramicSpeed headset bearings, and dual-sided power meters paired with either Shimano Dura-Ace Di2 or SRAM RED AXS. These top builds also introduce the Roval Alpinist CLX III wheels, which utilize lightweight composite spokes to drop rotational weight.

The Pro tier shifts to a slightly heavier FACT 10r carbon frame. These builds use Shimano Ultegra Di2 or SRAM Force AXS, both including power meters. They retain the integrated Alpinist Cockpit II but step down to Roval Alpinist CL II wheels with standard steel spokes.

The entry-level Expert models share the FACT 10r frame and drivetrain options of the Pro tier but omit the power meters. To reduce costs, the Expert builds use a traditional two-piece alloy stem and carbon handlebar, alongside shallower Roval C38 carbon wheels. Across all price points, the bikes ship with 28mm Specialized Turbo tires, leaving the frame's 35mm clearance available for riders who want to upgrade to higher-volume rubber.

Reviewers consistently praise the Aethos 2 for its exceptional ride quality, noting that it climbs with remarkable ease and accelerates eagerly. The frame's low weight and refined carbon layup translate to a highly responsive experience on steep gradients. On the road, testers found the bike "positively addictive during the small surges" (Velo) that happen in group rides.

While the original model was sometimes criticized for feeling nervous on fast descents, the revised geometry has largely remedied this. The longer wheelbase and lower bottom bracket help the bike track smoothly, with one tester noting it was "never unruly and never flapped once" (Cycling Weekly) on poor surfaces. Another reviewer highlighted that the bike "responds eagerly to pedal inputs" (Cyclist Magazine) whether seated or climbing out of the saddle.

The primary tradeoff is aerodynamic efficiency. Without deep tube shapes, the Aethos 2 requires more effort to maintain high speeds on flat terrain or in headwinds compared to dedicated aero bikes. Additionally, multiple reviewers expressed frustration with the stock 28mm tires. Despite the frame's generous clearance, testers felt the narrow rubber transmitted unnecessary road chatter, suggesting that upgrading to wider tires is essential to fully realize the frame's comfort potential.