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Cervélo S5 geometryRoad · 2026 · 6 sizes, from 48 to 61

The Cervélo S5 is a road bike available in 6 sizes, from 48 to 61. Stack ranges from 496 to 608 mm and reach from 367 to 409 mm. Its geometry is low and long, with a racing fit. All sizes share 405 mm chainstays.

Stack496–608mm
Reach367–409mm
Head angle71.0–73.5°
Chainstay length405mm
Agile rearLivelySlack seat angle

What size S5 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 →
48S 496 · R 367
51S 519 · R 376
54S 542 · R 384
56S 565 · R 392
58S 588 · R 401
61S 608 · R 409

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

Geometry chart by size

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

Size485154565861
Stack496519542565588608
Reach367376384392401409
Head tube length6482104125152173
Head angle71.0°72.0°73.0°73.5°73.5°73.5°
Chainstay length405405405405405405
Wheelbase9739749759829991,013
Front centre579580581588604617
BB drop757572727070
BB height267267269269272272
Fork offset595347444444
Trail565656565656
Standover712734758781804822
Top tube (method not stated)520535550565581595
Seat tube (method not stated)438459480502523542
Seat angle (method not stated)73.0°73.0°73.0°73.0°73.0°73.0°

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

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Cervélo S5 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.

340350360370380390400410420430460480500520540560580600620640reach (mm) →↑ stack (mm)485154565861

Character of each size

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

48
51
54
56
58
61
Positionracing → relaxed
Steeringcalm → quick
Pedallingrearward → forward
Bottom brackethigh → low
Wheelbaselively → planted
Rear endstable → agile

Bikes with similar geometry (size 54)

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

ModelΔ stackΔ reach
Factor OSTRO VAM · 542026±0 mm±0 mmCompare →
Ridley Helium Disc · S2024±0 mm±0 mmCompare →
Pinarello DOGMA F 1 OF A KIND · 5002026+0 mm−1 mmCompare →
Pinarello DOGMA F EDIZIONE SPECIALE · 5002026+0 mm−1 mmCompare →
Pinarello Dogma F · 5002026+0 mm−1 mmCompare →
Pinarello Dogma F12 · 5302019+1 mm−1 mmCompare →
S5 or OSTRO VAM? In size 54 they have exactly the same stack and reach (542 / 384 mm): the difference is in the frame and build, not the position.

Frequently asked questions

What size S5 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 496/367 mm in size 48 to 608/409 mm in size 61). 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 S5 in size 54?

Stack of 542 mm and reach of 384 mm.

Is the S5 a racing or an endurance bike?

Racing. In size 54 its stack-to-reach ratio is at percentile 32 of road bikes: a low, stretched position.

Does it have the same geometry as the OSTRO VAM?

In size 54, yes: same stack and reach. If one already fits you, the same size of the other will put you in the same position.