Colnago G4X - Shimano GRX 825 Di2 2x - Vision SC45

The perfect balance between racing performance and Gravel spirit

The Colnago G4-X was created with a clear goal: to offer maximum performance both on and off-road. Thanks to the meticulous optimization of its carbon monocoque frame, this gravel bike guarantees impeccable handling, high downhill stability, and exceptional responsiveness when accelerating. True to the Colnago tradition, the ride quality is extraordinarily smooth, rewarding, and dynamic.

Whether you are competing in a gravel race or going for a fast ride on unpaved roads and asphalt, the G4-X demands to be ridden hard, without ever sacrificing comfort or control.

Highlights and Key Features

• G Series Carbon Monocoque Frame: Stiff, lightweight, and engineered to absorb vibrations from rough terrain.
• Shimano GRX Di2 2x12s Electronic Drivetrain: Instant, precise, and effortless shifting even under extreme conditions.
• Vision SC 45 Disc Carbon Wheels: 45 mm rim depth with a 21 mm internal width, offering aerodynamic stability and maximum power transfer.
• Pirelli Cinturato Gravel 40 TLR Tires: Superior grip and exceptional rolling efficiency on dirt, gravel, and asphalt (tire clearance up to 42 mm).
• Colnago CC.01 Wide Integrated Cockpit: Clean aerodynamics, torsional stiffness, and ergonomics optimized for off-road riding.

Detailed Technical Specifications

Frame & Fork

• Series: G Series
• Model: Colnago G4-X
• Frame Material: Monocoque Carbon
• Fork: Carbon for disc brakes, external cables, round section
• Headset: ACROS ss 42x52x7mm - 40x52x7mm
• Seatpost: Carbon D-Shape (0.15 offset)
• Thru Axles: 12x100 mm (Front) / 12x142 mm (Rear)

Drivetrain

• Groupset: Shimano GRX 825 Di2 2x (Electronic)
• Front Derailleur: Shimano GRX FD-RX820
• Rear Derailleur: Shimano GRX RD-RX820
• Crankset: Shimano GRX 2x (48-31T)
• Cassette: Shimano GRX 11-36T (12-Speed)
• Chain: Shimano CN-M8100 12S
• Bottom Bracket: ACROS T47
• Crank Length: Sizes 450-480 (170 mm) | Sizes 520-570 (172.5 mm)

Brakes

• Braking System: Shimano RX-820 Hydraulic
• Brake Levers: Shimano ST-RX820
• Rotors: Shimano RT-MT800-S 160 mm (Front / Rear)

Wheels & Tires

• Rims: Vision SC 45 Disc (Hooked Carbon)
• Rim Height: 45 mm
• Internal Width: 21 mm
• Tires: Pirelli Cinturato Gravel 40 TLR
• Max Tire Clearance: 42 mm

Components

• Integrated Cockpit: Colnago CC.01 Wide (Size varies according to frame size)
• Saddle: Selle Italia Model X BB FEC / NOVUS BOOST EVO Superflow FeC
• Handlebar Tape: Colnago Grip Black
• Included Accessories: 1x Colnago Matt Black Bottle Cage