Specialized Men's Stumpjumper ST Alloy 27.5

Name: Specialized Men's Stumpjumper ST Alloy 27.5
Brand: Specialized

2018 MountainTrail Manufacturer page

Last known price: $1,870

Prices shown first for United States
Travel: 130 / 130 mm Fork / rear shock
Wheels: 27.5″
Drivetrain: 1 × 11 32t / 11–46t
Gear range: 418%
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 158–171
MD 168–180
LG 178–189
XL 186–199

Components

15 of 21 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Frame and fork

1 part

Frame

M5 alloy chassis and rear end, asymmetrical design, 27.5 Trail Geometry, threaded BB, fully enclosed internal cable routing, 12x148mm dropouts, sealed cartridge bearing pivots, replaceable derailleur hanger, 130mm of travel Not identified

Suspension

2 parts

Drivetrain

6 parts

Bottom bracket
- SRAM
Cassette
- SunRace 11–46t
Chain
- KMC X11 11 speeds
Crankset
- SRAM NX 32t
Rear derailleur
- Shimano SLX
Shifters
- Shimano SLX SL-M7000
SL-M7000

Brakes

1 part

Brakes
- Tektro Gemini

Wheels and tires

5 parts

Front hub
- Specialized
Rear hub
- Specialized
Rims

Double-wall, 27mm internal width, 32H Not identified
Spokes

Stainless, 14g Not identified
Tires

Front: Butcher, GRID Casing, GRIPTON® compound, 2Bliss Ready, 27.5 x 2.3", Rear: Purgatory, GRID casing, GRIPTON® compound, 2Bliss Ready, 27.5 x 2.3" Not identified

Cockpit and contact points

6 parts

Grips
- Specialized
Handlebar
- Specialized
Pedals
- Specialized
Saddle

Body Geometry Henge Sport, steel rails, 143mm Not identified
Seatpost

Alloy, two-bolt clamp, 34.9mm Not identified
Stem
- Specialized

Sizes and geometry

4 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 444mm

Stack 590mm

Wheelbase 1170mm

Head angle 66.5°

Seat angle 75.6°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 27.5″ wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 4 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	425	444	465	490
Stackmm	586	590	618	631
Top tube lengthmm	568	591	624	657
Seat tube lengthmm	380	410	455	505
Head tube lengthmm	105	110	140	155
Head tube angle	66.5°	66.5°	66.5°	66.5°
Seat tube angle	75.2°	75.6°	76°	76.3°
Chainstay lengthmm	432	432	432	432
Wheelbasemm	1149	1170	1203	1234
Front centermm	718	739	772	803
Bottom bracket dropmm	28	28	28	28
Bottom bracket heightmm	325	325	325	325
Standover heightmm	744	749	761	762
Fork rakemm	46	46	46	46
Trailmm	103	103	103	103
Stack/reach ratio	1.38	1.33	1.33	1.29
Suspension and parts
Crank lengthmm	170	170	170	170
Handlebar widthmm	780	780	780	780
Stem lengthmm	50	50	50	50
Seatpost lengthmm	375	375	435	435

Not published by the manufacturer: Front travel, Rear travel, Stem angle and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum

Suspension

Suspension configuration: Full suspension
Front travel: 130 mm
Rear travel: 130 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 32
Largest chainring: 32
Rear sprockets: 11
Smallest sprocket: 11
Largest sprocket: 46
Lowest gear: 19.1 in
Highest gear: 80.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Bottom bracket standard: BSA
Fork spring: Air
Tire width: 2.3″
Wheel material: Aluminum
Wheel size: 27.5″

Technical analysis

4 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Front travel

130 mm

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2018
Sample: 916 bicycles with this information
Coverage: 98.6% of the class

Lowest gear

19.1 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2018
Sample: 836 bicycles with this information
Coverage: 89.9% of the class

Highest gear

80.0 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2018
Sample: 836 bicycles with this information
Coverage: 89.9% of the class

Shifting

Mechanical

25 of 929 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2018
Sample: 929 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 7.3 km/h
Highest gear: 30.6 km/h

Total gear range 418%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.

This bicycle: 19.1–80.0 gear inches
Class reference (p10–p90): 16.5–93.5 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Trail Model year: 2018
Lowest gear: 836 bicycles with this information, 89.9% of the class
Highest gear: 836 bicycles with this information, 89.9% of the class

Lineup changes

The published facts that differ across this family's builds and from the same model a year earlier. Missing information never counts as zero.

Differences across 2018 builds

Differences across 2018 builds
Specification	This bicycle Specialized Men's Stumpjumper ST Alloy 27.5	Specialized Men's Stumpjumper Comp Alloy 27.5	Specialized Men's Stumpjumper Comp Alloy 29	Specialized Men's Stumpjumper Comp Carbon 27.5	Specialized Men's Stumpjumper Comp Carbon 29	Specialized Men's Stumpjumper Expert 27.5
Frame
Frame material	Aluminum	Aluminum	Aluminum	Carbon	Carbon	Carbon
Fork material	Not informed	Aluminum	Aluminum	Aluminum	Aluminum	Not informed
Suspension
Front travel	130 mm	150 mm	150 mm	150 mm	150 mm	150 mm
Rear travel	130 mm	150 mm	140 mm	150 mm	140 mm	150 mm
Drivetrain
Smallest chainring	32	32	30	32	30	32
Largest chainring	32	32	30	32	30	32
Rear sprockets	11	11	11	11	11	12
Smallest sprocket	11	11	11	11	11	10
Largest sprocket	46	46	46	46	46	50
Lowest gear	19.1 in	19.1 in	18.9 in	19.1 in	18.9 in	17.6 in
Highest gear	80.0 in	80.0 in	79.1 in	80.0 in	79.1 in	88.0 in
Cockpit
Seatpost	Rigid seatpost	Dropper seatpost	Dropper seatpost	Dropper seatpost	Dropper seatpost	Dropper seatpost
Other specifications
Tire width	2.3″	2.6″	2.6″	2.6″	2.6″	2.6″
Wheel material	Aluminum	Aluminum	Aluminum	Aluminum	Aluminum	Not informed
Wheel size	27.5″	27.5″	29″	27.5″	29″	27.5″