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BH Spike geometryMTB · 2026 · 4 sizes, from SM to XL

The BH Spike is a mtb bike available in 4 sizes, from SM to XL. Stack ranges from 614.6 to 642.5 mm and reach from 387.1 to 423.6 mm. Its geometry is tall and short, built for comfort. All sizes share 455 mm chainstays.

Stack614.6–642.5mm
Reach387.1–423.6mm
Head angle68.5–68.5°
Chainstay length455mm
Stable rearRelaxedSlack seat anglePlanted

What size Spike 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 614.6 · R 387.1
MDS 623.9 · R 395.8
LAS 633.2 · R 406.4
XLS 642.5 · R 423.6

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
Stack615624633643
Reach387396406424
Head tube length100110120130
Head angle68.5°68.5°68.5°68.5°
Chainstay length455455455455
Wheelbase1,0971,1101,1241,145
Front centre649662676697
BB drop60606060
Fork length508508508508
Top tube (method not stated)575587600620
Seat tube (method not stated)390440480530
Seat angle (method not stated)73.0°73.0°73.0°73.0°

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

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BH Spike 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.

360370380390400410420430440450580600620640660680reach (mm) →↑ stack (mm)SMMDLAXL

Character of each size

Compared with other mtb 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 mtb models, by stack and reach.

ModelΔ stackΔ reach
BH Expert · SM2026−5 mm+1 mmCompare →
Wilier Triestina 503X Race · S2024−7 mm−1 mmCompare →
Cube Reaction · S2026−8 mm+4 mmCompare →
Cube Reaction SLX · S2026−8 mm+4 mmCompare →
Trek Procaliber · S2025−10 mm+9 mmCompare →
Specialized S-Works Stumpjumper · S12026−13 mm+4 mmCompare →

Frequently asked questions

What size Spike 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 614.6/387.1 mm in size SM to 642.5/423.6 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 Spike in size MD?

Stack of 623.9 mm and reach of 395.8 mm.

Is the Spike a racing or an endurance bike?

Endurance. In size MD its stack-to-reach ratio is at percentile 98 of mtb bikes: a tall, short position.