Cannondale SuperSix EVOvsSuperX

The SuperSix EVO has matured into a do-it-all road weapon that makes the brand's dedicated aero bike, the SystemSix, look increasingly unnecessary. It carries the weight-saving heritage of its predecessors but has been nipped and tucked in the wind tunnel to save 12 watts over the previous generation. Meanwhile, the SuperX name returns for 2025, shedding its cyclocross-only skin to become a pure gravel racing specialist that still feels comfortable between the tapes on a mud-slicked course. Both bikes leverage Cannondale’s Delta steerer design, which allows for fully internal routing through a narrow headtube without resorting to massive, drag-heavy bearings. While the SuperSix aims to dominate local crits and alpine descents, the SuperX focuses on the high-speed demands of gravel racing, optimized for aerodynamic efficiency at a more realistic 35km/h. They share a design language of dropped stays, thin tube profiles, and a move back to threaded BSA bottom brackets that will make every home mechanic breathe a sigh of relief.

Riding the SuperSix feels like the bike is removing itself from your consciousness. Reviewers have noted a mellow stability when cruising that transforms into pinpoint precision when diving into a corner at 70km/h. It isn't twitchy, but it responds to weight shifts at the hips rather than just inputs at the bars. However, the aero-shaped seatpost and stouter fork have introduced more harshness than the Gen 3 model, making 28mm or 30mm tires almost mandatory for anyone riding on less-than-perfect pavement. The SuperX takes that road-racing DNA and stretches it for the dirt. It uses OutFront steering geometry, pairing a slacker 71-degree head angle with a long 55mm fork offset. This keeps the front wheel far enough ahead to prevent endoing on steep, chunky descents while maintaining enough trail to keep the steering quick and responsive. On washboard surfaces, the frame’s built-in flex zones and D-shaped seatpost filter out high-frequency chatter that would otherwise lead to arm pump during a five-hour effort. While the SuperSix feels like it is on rails during a high-speed descent, the SuperX is about composure over the rough stuff. It is a natural-born climber on gravel, with a stiff bottom bracket area that translates every watt into forward momentum without the skipping often felt on stiffer, less compliant gravel frames. Both bikes encourage you to ride like a fool with energy to spare, though the SuperX will eventually lag behind a true mountain bike once the terrain turns into a technical rock garden.