cannondale supersix gravel bike Cannondale SuperX Carbon 3 Gravel Bike

The Cannondale SuperX Carbon 3 Bike is Cannondale's entry point into the SuperX platform — a gravel race bike with genuine cyclocross DNA, redesigned from the ground up for competitive gravel. The SuperX lineage was built on CX podiums before Cannondale pivoted it into one of the more purposeful gravel race frames on the market. The Carbon 3 puts that platform in reach of a broader range of riders: a full SuperX carbon frame and fork, Shimano GRX 820 mechanical shifting, Vittoria Terreno tubeless-ready tires, and DT Swiss G1800 wheels. This is not an all-road bike or a bikepacking rig. It's a race bike built to run 40mm tires on unpredictable terrain.

The SuperX carbon frame is built with Cannondale's Proportional Response construction, meaning the carbon layup is tuned individually for each frame size rather than scaled from a single schedule. Smaller frames get a construction optimized for their stiffness and weight requirements; larger sizes get theirs. Dedicated flex zones in the seat tube, rear triangle, and top tube work as a system to generate vertical compliance on rough surfaces — structural decisions, not passive material choices. That compliance runs through the cockpit as well: the Cannondale C1 Aero 27 Carbon seatpost (D-shaped, SmartSense compatible) handles the final link between frame and saddle. Tire clearance runs to 48mm in the frame and 51mm in the fork, which gives the SuperX room to run genuinely capable rubber across varying terrain. An integrated top tube bag mount sits flush when not in use, and the frame carries a lifetime guarantee.

The Delta Steerer system routes housing cleanly through the headset and into the frame, eliminating external cable loops at the stem and keeping aerodynamic lines across the front end. The result is a cockpit that functions closer to an aero road bike than a conventional gravel machine — and one with fewer surfaces for mud and grit to accumulate during long events. Handling character is defined by OutFront Geometry: a slack head tube angle paired with a 55mm fork offset positions the front wheel further forward than most gravel bikes, building stability on rough descents and loose surfaces without dulling steering through corners. Chainstay length is a consistent 422mm across all six sizes — 46 through 61 — keeping the rear end compact and the handling consistent regardless of which size you're on.

Shimano GRX 820 is the top tier of Shimano's gravel-specific mechanical groupset, and the Carbon 3 runs it throughout: front derailleur, rear derailleur, hydraulic brake levers, and GRX 820 crankset. The crankset runs a 48/31T chainring configuration, mated to a Shimano 105 R7100 12-speed cassette in an 11-36T spread. The cassette is 105-spec rather than GRX — a cost decision that doesn't affect shift quality, which comes entirely from the derailleurs and levers. That gearing range covers extended climbing without becoming awkward on fast flat hardpack, a spread that works well for mixed-terrain events where a single race might demand both. Shimano CL800 160mm rotors front and rear handle braking through the GRX 820 hydraulic calipers.

DT Swiss G1800 wheels arrive tubeless ready, paired with Vittoria Terreno T50 tires in 700x40 — also tubeless ready from the factory. The Terreno T50's tread pattern is designed to roll fast on hardpack while maintaining traction on loose dirt, a balanced choice for race-day conditions that can't be predicted in advance. The cockpit is built on Cannondale's own components: C1 Conceal alloy stem at -6 degrees, C2 Compact alloy handlebar, and 3.5mm Cannondale bar tape. The Prologo Dimension AGX STN saddle is a gravel-specific design with cutout relief. Six sizes cover 46 through 61, giving riders at both ends of the range access to the same geometry and the same compliance character.