Colnago G4-X Shimano Grx 825 Di2 bike 2025

Please note: The bikes are assembled according to the manufacturer's specifications with default features according to size. For any assembly requests or specifications other than the basic ones, please contact our costumer service directly before purchase.

A balanced gravel racing bike, to perform at its best in every context

The G4-X is the result of optimizing all those factors that are important when you have to compete or go hard on dirt roads: handling, lightness, downhill rideability, stability, frame responsiveness, and, like all Colnago bikes, surprisingly wonderful to ride. The perfect harmony of the elements, a balanced gravel bike. Colnago G4-X is a bike that demands to be pedaled fast, without sacrificing handling and riding pleasure.

Tyres
The G4-X can fit tyres with a maximum nominal width of 45 mm.

Four mounting points
For longer adventures you may need to add panniers and bottle cages. For this reason, the G4-X is equipped with four mounting points for bottle cages or small bags.

Bottom bracket
The G4-X mounts the standard T47 bottom bracket.

Tech spec

Frame kit

• Frame (material): Monocoque carbon
• Fork (material): Carbon fork for disc brakes, external cables, section with round circumference
• Headset bearings: ACROS ss 42x52x7mm - 40x52x7mm
• Seatpost: Carbon seatpost, 0.15 offset, "D-Shape" section
• Through axles: Diameter: 12 mm. length 100 mm (front) - 142 mm (rear)

Drivetrain

• Shifter: Shimano GRX 825 Di2 2x
• Front Derailleur: Shimano GRX Di2 FD-RX825 Front Derailleur 2x12 v
• Rear Derailleur: Shimano GRXDi2 RD-RX825 Rear Derailleur 2x12 v
• Chain: Shimano GRX: Shimano CN-M8100 12V
• Crankset: Shimano GRX 2x: 48-31T
• Sprocket Set: Shimano GRX 2x: 11-36 12v
• Bottom Bracket: T47
• Crank Length: 170 mm, 172. 5 mm, 175 mm

Brakes

• Brakes: Shimano RX-825, 160 mm Front / 160 mm Rear, RT-MT800-S rotors
• Discs size: 160 mm Front/ 160 mm Rear
• Brake lever: Shimano ST-RX825
• Brake caliper: Shimano RX-825

Wheels

• Rims: Vision sc45
• Material: Carbon
• Rims: Carbon, Spokes: Stainless steel.
• Rim height: Front: 45 mm; Rear: 45 mm
• Inner rim width: 21 mm
• Hubs: Hubs with direct pull spokes
• Thru-axles: Front: HH12-100 - Rear: HH12-142
• Tyres: Pirelli Cinturato Gravel 40 TLR
• Tyre size: 42 mm (nominal width)

Components

• Saddle: Prologo Kappa BK / Selle Italia Model X BB FEC
• Handlebar: Deda Gravel 100 (400, 420, 440 mm)
• Handlebar stem: Deda ZERO1 (90, 100, 110, 120 mm)
• Handlebar tape: Colnago Grip Black
• Bottle cage: Colnago Matt Black (1x)

Producer's notes: depending on component availability, specifications are subject to change without notice. Images are for illustrative purposes only.