Colnago G4-X Shimano GRX 820 2x 2025 bike details 01
Colnago G4-X Shimano GRX 820 2x 2025 bike details 02
Colnago G4-X Shimano GRX 820 2x 2025 bike details 03
Colnago G4-X Shimano GRX 820 2x 2025 bike details 04

Summary

The Colnago G4-X Shimano GRX 820 2x, a Road bike released in 2025, priced at £4000. The frame is Carbon Fiber and the fork is Carbon Fiber. The bike is equipped with a Shimano GRX 2x: Shimano FD-RX820, Shimano GRX 2x: Shimano FD-RX820 groupset (Electric Shifting: Yes). It uses Disc Brake. It rolls on a Fulcrum Lite ER wheelset. It features a Shimano T47-86mm, Shimano T47-86mm bottom bracket. It uses Internally Routed cable routing. It supports tyres up to 45 mm. Yes It comes with a limited 3-year warranty. Curious how it stacks up against similar bikes? Compare below...

Bike Info

Worldwide Shipping: Yes

Delivery across the globe!

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Warranty: 3 Years

Limited warranty website average: 3.12 years

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Released: 2025

The bike was released 1 years ago

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Bike Type: Road

The style of riding intended for this bike

Bike Spec

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Groupset

Shimano GRX 2x: Shimano FD-RX820, Shimano GRX 2x: Shimano FD-RX820

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Wheelset

Fulcrum Lite ER

Disc Brake

Brake Type: Disc Brake

Welcome to the future!

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Frameset Material

Carbon Fiber

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Max Tire Size: 45 mm

This is the max tire size you can use

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UCI Approved: Yes

You can use for official races

Sizing & Geometry

Frame Sizes

45 48 52 54 57

This frame comes in 5 sizes, this is 0.56 less sizes than the website average.

Handebar Sizes Available

42 44

Crank Arm Sizes Available

170 172.5

Frame Details

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Frame Weight

This frame weighs 1050g

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Frame Material

Carbon Fiber

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Forks

Carbon fork for disc brakes, external cables, section with round circumference

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Fork Material

The forks are made from Carbon Fiber

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Cables: Internally Routed

Routed through bars, stem and frame

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Axel Type: Thru-axle

How the wheels are secured to the frame

Disc Brake

Brake Type: Disc Brake

Welcome to the future!

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Brake Mount: Flat Mount

How the calipers are mounted

No

Integrated bar and stem: No

You can use any bar and stem

Drivechain Details

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Groupset name

Shimano GRX 2x: Shimano FD-RX820, Shimano GRX 2x: Shimano FD-RX820

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Electric Groupset: Yes

This bike has electric gears

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Shifters

Drivetrain, Shimano GRX 820 2x, Shimano GRX 820 2x

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Front Derailleur

Shimano GRX FD-RX820 (Braze-on via platform adapter) (Official).

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Rear Derailleur

Shimano GRX 2x: Shimano RD-RX820, Shimano GRX 2x: Shimano RD-RX820

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Cassette

Shimano CS-R8100 / CS-HG710-12 Series (Stock component paired directly to the GRX2x system) (Official / Inferred via Shimano ecosystem integration).

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Cranks

Shimano GRX FC-RX820-2 Hollowtech II (Official).

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Power Meter: No

This bike doesn't have a power meter

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Bottom Bracket

Shimano T47-86mm, Shimano T47-86mm

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Chain

Shimano CN-M8100 12-Speed XT/Ultegra grade directional chain (Official).

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Battery

Unknown

Wheel & Tire Details

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Wheelset Name

Fulcrum Lite ER (for clincher and tubeless ready)

Front Wheel Depth Icon

Front Wheel Depth

24.1mm

Rear Wheel Depth Icon

Rear Wheel Depth

24.1mm

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Tires

Pirelli Cinturato Gravel 40 TLR, Pirelli Cinturato Gravel 40 TLR

Tire Type Icon

Tire Type

Clincher

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Max Tire Size: 45 mm

This is the max tire size you can use

Brakes

Disc Brake

Brake Type: Disc Brake

Welcome to the future!

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Brake Mount: Flat Mount

How these disc brakes are mounted

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Brakes

Brakes, Shimano RX-820, 160 mm Front / 160 mm Rear, RT-MT800-S rotors, Shimano RX-820, 160 mm Front / 160 mm Rear, RT-MT800-S rotors

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Brake Rotors

160 mm Front / 160 mm Rear. Paired with premium Shimano RT-MT800 Centerlock rotors

Other Components

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Saddle

Saddle "Prologo" Kappa BK "Selle Italia" Model X BB FEC

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Seatpost

Carbon seatpost, 0.15 offset, "D-Shape" section

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Handlebars

CC.01 Wide integrated cockpit, Sizes 450, Width: 400 mm, Sizes 480 -540, Width: 420 mm, Sizes 570, Width: 440 mm, CC.01 Wide integrated cockpit, Sizes 450, Width: 400 mm, Sizes 480 -540, Width: 420 mm, Sizes 570, Width: 440 mm

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Bar Tape