Colnago G3-X Shimano GRX 820 2x

Name: Colnago G3-X Shimano GRX 820 2x
Brand: Colnago

2025 RoadGravel Manufacturer page

Suspension: Rigid
Wheels: 700c
Drivetrain: 2 × 12 31–48t / 11–36t
Gear range: 507%
Brakes: Hydraulic disc

Sizes

Size guide

The manufacturer did not publish rider heights for these sizes.

Components

13 of 18 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Drivetrain

7 parts

Bottom bracket
- Shimano SM-BB72-41B
SM-BB72-41B
Cassette
- Shimano
Chain
- Shimano Deore XT CN-M8100
CN-M8100
Crankset
- Shimano GRX 31t
Front derailleur
- Shimano GRX FD-RX820 2 speeds
FD-RX820
Rear derailleur
- Shimano GRX RD-RX820 12 speeds
RD-RX820
Shifters
- Shimano GRX

Brakes

2 parts

Brake levers
- Shimano GRX ST-RX820
ST-RX820
Brakes
- Shimano
RX-820RT-MT800

Wheels and tires

4 parts

Front hub

Aluminium, Sealed Cartridge Bearings, Aluminium, Sealed Cartridge Bearings Not identified
Rear hub

Aluminium, Sealed Cartridge Bearings, Aluminium, Sealed Cartridge Bearings Not identified
Rims

Front: 24 mm; Rear: 24 mm, Front: 24 mm; Rear: 24 mm Not identified
Tires
- Pirelli

Cockpit and contact points

5 parts

Handlebar
- Deda
Headset

ID30,1 OD41 36°/45° ID40 OD52 45°/45°, ID30,1 OD41 36°/45° ID40 OD52 45°/45° Not identified
Saddle
- Selle Italia MODEL X
Seatpost

Carbon seatpost, 0.15 offset, "D-Shape" section, Carbon seatpost, 0.15 offset, "D-Shape" section Not identified
Stem
- Deda

Sizes and geometry

5 sizes Open in the geometry plotter

Complete rider-height ranges are not published for these sizes. You can still explore the geometry below.

Size 52s

Table

Geometry diagram unavailable

The drawing needs wheelbase and seat tube length, which the manufacturer did not publish. Available facts remain in the table.

Size Reach Stack

Complete manufacturer geometry table 5 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	371	380	390	400	410
Stackmm	535	554	573	591	600
Top tube lengthmm	539	539	560	578	593
Head tube lengthmm	102	122	140	159	167
Head tube angle	70.8°	71.5°	71.5°	71.6°	71.9°
Seat tube angle	75°	74°	73.5°	73.2°	73°
Chainstay lengthmm	430	430	440	430	430
Bottom bracket dropmm	70	70	70	70	70
Bottom bracket heightmm	279	279	279	279	279
Stack/reach ratio	1.44	1.46	1.47	1.48	1.46
Suspension and parts
Crank lengthmm	170	170	172.5	175	175
Handlebar widthmm	400	420	420	430	430
Stem lengthmm	90	100	110	120	130

Not published by the manufacturer: Seat tube length, Wheelbase, Front center, Standover height, Fork rake, Trail, Front travel, Rear travel, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Fork material: Carbon

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 2
Smallest chainring: 31
Largest chainring: 48
Rear sprockets: 12
Smallest sprocket: 11
Largest sprocket: 36
Lowest gear: 25.0 in
Highest gear: 126.6 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Bottom bracket standard: BB86/BB92
Wheel material: Aluminum
Wheel size: 700c

Technical analysis

3 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Lowest gear

25.0 gear inches

This value is within the central range for this class.

Cohort: Road / Gravel Model year: 2025
Sample: 1,536 bicycles with this information
Coverage: 76.6% of the class

Highest gear

126.6 gear inches

This value is above the central range for this class.

Cohort: Road / Gravel Model year: 2025
Sample: 1,536 bicycles with this information
Coverage: 76.6% of the class

Shifting

Mechanical

688 of 1,999 bicycles with this information use electronic shifting.

Cohort: Road / Gravel Model year: 2025
Sample: 1,999 bicycles with this information
Coverage: 99.7% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 9.6 km/h
Highest gear: 48.5 km/h

Total gear range 507%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.

This bicycle: 25.0–126.6 gear inches
Class reference (p10–p90): 22.8–126.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Road / Gravel Model year: 2025
Lowest gear: 1536 bicycles with this information, 76.6% of the class
Highest gear: 1536 bicycles with this information, 76.6% of the class

Lineup changes

The published facts that differ across this family's builds and from the same model a year earlier. Missing information never counts as zero.

Differences across 2025 builds

Differences across 2025 builds
Specification	This bicycle Colnago G3-X Shimano GRX 820 2x	Colnago G3-X Shimano GRX 822 1x	Colnago G3-X SRAM Rival AXS
Drivetrain
Front chainrings	2	1	1
Smallest chainring	31	42	40
Largest chainring	48	42	40
Smallest sprocket	11	10	10
Largest sprocket	36	51	44
Lowest gear	25.0 in	23.9 in	26.4 in
Highest gear	126.6 in	121.8 in	116.0 in
Cockpit
Shifting	Mechanical	Mechanical	Electronic