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BH RS1 geometryRoad · 2026 · 5 sizes, from XS to XL

The BH RS1 is a road bike available in 5 sizes, from XS to XL. Stack ranges from 526 to 597 mm and reach from 370 to 393 mm. Its position sits between racing and endurance.

Stack526–597mm
Reach370–393mm
Head angle71.0–73.0°
Chainstay length412–418mm

What size RS1 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 →
XSS 526 · R 370
SMS 544 · R 375
MDS 557 · R 380
LAS 583 · R 388
XLS 597 · R 393

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.

SizeXSSMMDLAXL
Stack526544557583597
Reach370375380388393
Head tube length105120135160175
Head angle71.0°72.0°72.5°73.0°73.0°
Chainstay length412412415415418
Wheelbase9799819901,0011,013
Front centre578580585596605
BB drop7373707070
Fork length389389389389389
Top tube (method not stated)516531545561576
Seat tube (method not stated)460480500520540
Seat angle (method not stated)74.5°74.0°73.5°73.5°73.0°

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

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BH RS1 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.

350360370380390400410420480500520540560580600620640reach (mm) →↑ stack (mm)XSSMMDLAXL

Character of each size

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

XS
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 road models, by stack and reach.

ModelΔ stackΔ reach
Giant Defy Advanced · M2027+1 mm±0 mmCompare →
Pinarello Dogma X · 5002026+2 mm−1 mmCompare →
Pinarello NEW Dogma X · 4952026+2 mm−1 mmCompare →
Cervélo Caledonia-5 · 542026−2 mm−2 mmCompare →
Canyon Endurace Allroad · XS2027−3 mm−3 mmCompare →
Specialized S-Works Aethos · 542026+2 mm+4 mmCompare →

Frequently asked questions

What size RS1 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 526/370 mm in size XS to 597/393 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 RS1 in size MD?

Stack of 557 mm and reach of 380 mm.

Is the RS1 a racing or an endurance bike?

In between. In size MD its stack-to-reach ratio is at percentile 62 of road bikes: neither very low nor very tall.