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BH Gravelx AT geometryGravel · 2026 · 4 sizes, from SM to XL

The BH Gravelx AT is a gravel bike available in 4 sizes, from SM to XL. Stack ranges from 540 to 598 mm and reach from 370 to 398 mm. Its position sits between racing and endurance. All sizes share 428 mm chainstays.

Stack540–598mm
Reach370–398mm
Head angle70.5–72.0°
Chainstay length428mm
Slack seat angle

What size Gravelx AT 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 →
SMS 540 · R 370
MDS 556 · R 377
LAS 577 · R 387
XLS 598 · R 398

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

Geometry chart by size

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

SizeSMMDLAXL
Stack540556577598
Reach370377387398
Head tube length120140160180
Head angle70.5°71.0°71.5°72.0°
Chainstay length428428428428
Wheelbase1,0091,0191,0311,044
Front centre591602614626
BB drop75737371
Fork length390390390390
Top tube (method not stated)527548567587
Seat tube (method not stated)500520540560
Seat angle (method not stated)73.8°73.0°72.8°72.5°

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

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BH Gravelx AT 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.

350360370380390400410420500520540560580600620640reach (mm) →↑ stack (mm)SMMDLAXL

Character of each size

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

SM
MD
LA
XL
Positionracing → relaxed
Steeringcalm → quick
Pedallingrearward → forward
Bottom brackethigh → low
Wheelbaselively → planted
Rear endstable → agile

Bikes with similar geometry (size MD)

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

ModelΔ stackΔ reach
BH Gravelx R · MD2026±0 mm±0 mmCompare →
Cannondale SuperX · 542026−1 mm+1 mmCompare →
Colnago G3-X · 49s2026−2 mm+3 mmCompare →
Colnago G4-X · 4802026−2 mm+3 mmCompare →
KTM Gravelator Prime · XS2027−4 mm±0 mmCompare →
KTM Gravelator Master · XS2027−4 mm±0 mmCompare →
Gravelx AT or Gravelx R? In size MD they have exactly the same stack and reach (556 / 377 mm): the difference is in the frame and build, not the position.

Frequently asked questions

What size Gravelx AT 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 540/370 mm in size SM to 598/398 mm in size XL). 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 Gravelx AT in size MD?

Stack of 556 mm and reach of 377 mm.

Is the Gravelx AT a racing or an endurance bike?

In between. In size MD its stack-to-reach ratio is at percentile 58 of gravel bikes: neither very low nor very tall.

Does it have the same geometry as the Gravelx R?

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