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Colnago G3-X geometryGravel · 2026 · 5 sizes, from 46s to 58s

The Colnago G3-X is a gravel bike available in 5 sizes, from 46s to 58s. Stack ranges from 535 to 600 mm and reach from 371 to 410 mm. Its position sits between racing and endurance.

Stack535–600mm
Reach371–410mm
Head angle70.8–71.9°
Chainstay length430–440mm
Stable rearHigh BB

What size G3-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 →
46sS 535 · R 371
49sS 554 · R 380
52sS 573 · R 390
55sS 591 · R 400
58sS 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.

Size46s49s52s55s58s
Stack535554573591600
Reach371380390400410
Effective top tube539539560578593
Head tube length102122140159167
Head angle70.8°71.5°71.5°71.6°71.9°
Chainstay length430430440430430
Front centre588602614629637
BB drop7070707070
Fork length409409409409409
Seat angle (method not stated)75.0°74.0°73.5°73.2°73.0°

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

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Colnago G3-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)46s49s52s55s58s

Character of each size

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

46s
49s
52s
55s
58s
Positionracing → relaxed
Steeringcalm → quick
Pedallingrearward → forward
Bottom brackethigh → low
Wheelbaselively → planted
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Rear endstable → agile

Bikes with similar geometry (size 52s)

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

ModelΔ stackΔ reach
Colnago G4-X · 5202026±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 →
G3-X or G4-X? In size 52s 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 G3-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 46s to 600/410 mm in size 58s). 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 G3-X in size 52s?

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 G3-X a racing or an endurance bike?

In between. In size 52s 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 G4-X?

In size 52s, yes: same stack and reach. If one already fits you, the same size of the other will put you in the same position.