Which size or configuration labels have geometry for the 2018 Specialized Stumpjumper ST Men's Comp Carbon 27.5?

Geometry is listed for S, M, L, and XL.

What are the reach and stack of the 2018 Specialized Stumpjumper ST Men's Comp Carbon 27.5 in size L?

In size L, reach is 465 mm and stack is 618 mm.

What is the head tube angle of the 2018 Specialized Stumpjumper ST Men's Comp Carbon 27.5?

The head tube angle is 66.5 degrees in every size.

Which years of the Specialized Stumpjumper ST are on Quiver?

Quiver has the Specialized Stumpjumper ST for 2018, 2020, and 2019.

2018 Specialized Stumpjumper ST Men's Comp Carbon 27.5 geometry and specs

Key facts

Brand: Specialized
Model: Stumpjumper ST
Model year: 2018
Frame: Men's Comp Carbon 27.5
Type: Trail
Geometry labels: S, M, L, and XL
Drivetrain: Shimano XT
Fork: Fox FLOAT 34 Rhythm
Rear shock: Fox Float DPS Performance
Geometry: Complete for every size
Source: specialized.com
Checked: Oct 22, 2026

Geometry by size

Geometry drawing, size M, to scale.

2018 Specialized Stumpjumper ST Men's Comp Carbon 27.5 geometry by size
Measurement	S	M	L	XL
Reach(mm)	425	444	465	490
Stack(mm)	586	590	618	631
Head tube angle(°)	66.5	66.5	66.5	66.5
Seat tube angle(°)	76.3	76	75.6	75.2
Effective top tube(mm)	568	591	624	657
Chainstay length(mm)	432	432	432	432
Wheelbase(mm)	1149	1170	1203	1234
BB drop(mm)	28	28	28	28
BB height(mm)	325	325	325	325
Standover(mm)	731	735	750	766
Seat tube length(mm)	380	410	455	505
Fork length(mm)	522	522	522	522
Head tube length(mm)	105	110	140	155

How to read a geometry chart

Stock build

15 parts

Suspension

Fox FLOAT 34 Rhythm

ForkWheel size 27.5Front axle / spacing 15x110 (Boost)Offset 51mm

Fox Float DPS Performance

Rear shockEye-to-eye length 190mmStroke 42.5mm

Drivetrain

Shimano SLX

ShifterSpeeds 11

Shimano XT

DerailleurSpeeds 11

Shimano SLX

CassetteSpeeds 12Range 11-46

KMC X-11

ChainSpeeds 11

Race Face Aeffect

CranksetChainring interface CinchSpindle / BB interface CinchCrank length 170mm

Wheels & Tires

Specialized Butcher

TireWheel size 27.5Width 2.3Bead FoldingTubeless ready 2Bliss ReadyWeight ~1060 g

Specialized Purgatory

TireWheel size 27.5Width 2.3Tubeless ready 2Bliss Ready

Roval Traverse 27.5

Rim

Brakes

Shimano SLX

BrakePiston count 4

Cockpit

Specialized Sip Grip

Grips

Seatpost & Saddle

X-Fusion Manic

Dropper post

X-Fusion Manic

SeatpostMaterial AluminumClamp style Two-Bolt

Specialized Phenom Comp

Saddle

Keep your Stumpjumper ST Men's Comp Carbon 27.5 in Quiver

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Quick answers

Which size or configuration labels have geometry for the 2018 Specialized Stumpjumper ST Men's Comp Carbon 27.5?: Geometry is listed for S, M, L, and XL.
What are the reach and stack of the 2018 Specialized Stumpjumper ST Men's Comp Carbon 27.5 in size L?: In size L, reach is 465 mm and stack is 618 mm.
What is the head tube angle of the 2018 Specialized Stumpjumper ST Men's Comp Carbon 27.5?: The head tube angle is 66.5 degrees in every size.
What does the 2018 Specialized Stumpjumper ST Men's Comp Carbon 27.5 ship with?: The stock build includes Fox FLOAT 34 Rhythm, Shimano SLX, Specialized Butcher, and Shimano SLX.
Which years of the Specialized Stumpjumper ST are on Quiver?: Quiver has the Specialized Stumpjumper ST for 2018, 2020, and 2019.