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Colnago G4-X geometryGravel · 2026 · 5 sizes, from 450 to 570

The Colnago G4-X is a gravel bike available in 5 sizes, from 450 to 570. Stack ranges from 535 to 600 mm and reach from 371 to 410 mm. Its position sits between racing and endurance. All sizes share 430 mm chainstays.

Stack535–600mm
Reach371–410mm
Head angle71.0–71.5°
Chainstay length430mm
High BB

What size G4-X do I need?

Enter the stack and reach of a bike that fits you well and we will tell you which size is closest and how to set it up.

Compare on Fitbikefy →
450S 535 · R 371
480S 554 · R 380
520S 573 · R 390
540S 591 · R 400
570S 600 · R 410

Enter your stack and reach to see which size fits you best.

Geometry chart by size

Measurements in mm and degrees, as published by Colnago. The ones that matter most for choosing a size are in bold.

Size450480520540570
Stack535554573591600
Reach371380390400410
Effective top tube524539560581596
Head angle71.0°71.5°71.5°71.5°71.5°
Chainstay length430430430430430
Front centre585596613628644
BB drop7272707070
Fork length406406406406406
Seat angle (method not stated)74.0°74.0°73.5°73.0°73.0°

Source: Colnago official website · data from 11 Nov 2026.

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Colnago G4-X 2026

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Stack and reach of every size

Higher means a taller front end; further right means a longer reach. The blue dot is your search.

350360370380390400410420430500520540560580600620640reach (mm) →↑ stack (mm)450480520540570

Character of each size

Compared with other gravel bikes. Further right means more of that quality.

450
480
520
540
570
Positionracing → relaxed
Steeringcalm → quick
Pedallingrearward → forward
Bottom brackethigh → low
Wheelbaselively → planted
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Rear endstable → agile

Bikes with similar geometry (size 520)

The closest size of other gravel models, by stack and reach.

ModelΔ stackΔ reach
Colnago G3-X · 52s2026±0 mm±0 mmCompare →
Colnago G5-X · 5102026±0 mm+2 mmCompare →
Wilier Triestina Rave SLR Gravel · L2025−3 mm+1 mmCompare →
Wilier Triestina Rave SL · L2025−3 mm+1 mmCompare →
BH Gravelx R · LA2026+4 mm−3 mmCompare →
BH Gravelx AT · LA2026+4 mm−3 mmCompare →
G4-X or G3-X? In size 520 they have exactly the same stack and reach (573 / 390 mm): the difference is in the frame and build, not the position.

Frequently asked questions

What size G4-X do I need?

It depends on your position, not just your height. The most reliable way is to compare the stack and reach of a bike that fits you with those of each size (from 535/371 mm in size 450 to 600/410 mm in size 570). The size finder on this page shows the closest size and the stem and spacers you would need.

What are the stack and reach of the G4-X in size 520?

Stack of 573 mm and reach of 390 mm, with an effective top tube of 560 mm and a head angle of 71.5°.

Is the G4-X a racing or an endurance bike?

In between. In size 520 its stack-to-reach ratio is at percentile 53 of gravel bikes: neither very low nor very tall.

Does it have the same geometry as the G3-X?

In size 520, yes: same stack and reach. If one already fits you, the same size of the other will put you in the same position.