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Specialized Sirrus geometryUrban · 2026 · 6 sizes, from XXS to XL

The Specialized Sirrus is a urban bike available in 6 sizes, from XXS to XL. Stack ranges from 536 to 633 mm and reach from 373 to 414 mm. Its geometry is low and long, with a racing fit. All sizes share 440 mm chainstays.

Stack536–633mm
Reach373–414mm
Head angle69.5–71.0°
Chainstay length440mm
RacingLow BB

What size Sirrus 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 →
XXSS 536 · R 373
XSS 555 · R 388
SS 563 · R 393
MS 593 · R 398
LS 608 · R 402
XLS 633 · R 414

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

Geometry chart by size

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

SizeXXSXSSMLXL
Stack536555563593608633
Reach373388393398402414
Effective top tube532552560574582602
Head tube length121139147175191217
Head angle69.5°70.0°70.0°71.0°71.0°71.0°
Chainstay length440440440440440440
Wheelbase1,0361,0531,0611,0671,0761,096
Front centre606623631636645665
BB drop707070707070
BB height288288288288288288
Fork length395395395395395395
Fork offset515151515151
Trail797676696969
Standover702725755785815837
Seat tube (method not stated)360395440470510530
Seat angle (method not stated)73.5°73.5°73.5°73.5°73.5°73.5°

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

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Specialized Sirrus 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.

350360370380390400410420430440500520540560580600620640660680reach (mm) →↑ stack (mm)XXSXSSMLXL

Character of each size

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

XXS
XS
S
M
L
XL
Positionracing → relaxed
Steeringcalm → quick
Pedallingrearward → forward
Bottom brackethigh → low
Wheelbaselively → planted
Rear endstable → agile

Bikes with similar geometry (size S)

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

ModelΔ stackΔ reach
Canyon Roadlite AL CF · S2025+8 mm+3 mmCompare →
Trek FX · S2022+5 mm−8 mmCompare →
Cube Nulane · S2026+1 mm−10 mmCompare →
Cube Editor SLX FE · 46 cm2026+10 mm−2 mmCompare →
Cube Editor SLX · 46 cm2026+10 mm−2 mmCompare →
Cube Editor · 46 cm2026+10 mm−2 mmCompare →

Frequently asked questions

What size Sirrus 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 536/373 mm in size XXS to 633/414 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 Sirrus in size S?

Stack of 563 mm and reach of 393 mm, with an effective top tube of 560 mm and a head angle of 70.0°.

Is the Sirrus a racing or an endurance bike?

Racing. In size S its stack-to-reach ratio is at percentile 13 of urban bikes: a low, stretched position.