Description
Excellent condition approved used bike with little to no signs of use
Colnago G4X Shimano GRX Di2 Gravel Bike
The Colnago G4-X Gravel Bike is built for speed, stability, and control on mixed terrain. Evolving from the G3-X, it features refined geometry for confident handling on descents, clearance for tyres up to 45 mm, and a lightweight full carbon frame and fork.
Colnago's versatile drivetrain compatibility
The G4-X is compatible with both 1x and 2x drivetrains, mechanical or electronic shifting, and uses a threaded T47 bottom bracket for durability and easy maintenance.
G4-X's adventure-ready features
A UDH rear hanger and four mounting points make it ready for long-distance and bikepacking setups. The UCI-approved cyclocross frame and flared integrated cockpit ensure it performs in competitive and adventurous scenarios alike.
- Certified Quality & Peace of Mind
Every bike is meticulously inspected to the highest safety standards and comes with a one-year warranty*, ensuring reliability and performance you can trust. - Premium Bikes, Lower Prices
Own a high-end bike for less – get access to top-tier brands and models at a fraction of the cost, making performance cycling more affordable. - Sustainable & Eco-Friendly Choice
Choosing a pre-owned bike helps reduce waste and extends the life of quality bicycles, making it a greener way to ride. - Hassle-Free Trade-In & Upgrade
Easily part-exchange your old bike for an upgrade, making it simple to switch, save, and keep riding the best bike for your needs
Approved Used Warranty Information
Technical Specification
| Frame | Colnago G4X 2025 - 48cm |
| Fork | Stock Colnago G4X Carbon Fork |
| Stem | Colnago RS10 Alloy - 90mm |
| Handlebar | Deda Superzero Gravel Alloy - 40cm |
| Levers/Shifters | Shimano GRX RT-M800, 160 mm rotor |
| Front Derailleur | Shimano GRX FD-RX820 2x |
| Rear Derailleur | Shimano GRX RD-RX820 12 speed |
| Cassette | Shimano GRX CS-HG710 11-36T 12 speed |
| Crankset | Shimano GRX FC-RX820 48-31T 2x, 170mm cranks |
| Wheels | Fulcrum Rapid Red 900 DB 622x22 |
| Tyres | Pirelli Cinturato 700-40C tube-type |
| Saddle | Selle Italia Model X |
| Seatpost | Stock Colnago Carbon |
| Pedals | Available to be purchased separately |
Size Guide
Colnago G4X 2025 48cm - Approved Used Sizing
Delivery & Returns
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Why buy a used bike from Sigma Sports?
Every bike is meticulously inspected to the highest safety standards and comes with a one-year warranty*, ensuring reliability and performance you can trust.
Own a high-end bike for less – get access to top-tier brands and models at a fraction of the cost, making performance cycling more affordable.
Choosing a pre-owned bike helps reduce waste and extends the life of quality bicycles, making it a greener way to ride.
Easily part-exchange your old bike for an upgrade, making it simple to switch, save, and keep riding the best bike for your needs.