2021 Specialized Bicycles Stumpjumper Alloy (Low BB) S4

Build

700C/29 in × 2.3 in

Insights

Average stack and reach vs trend of full-suspension trail mtb bikes
Design deviates from other sizes of Specialized Bicycles Stumpjumper
Suspension sag unknown
Geometry may mis-represent actual riding geometry

Stack and Reach vs. Category Trend
View all sizes

Geometry

Stack
631mm
Reach
475mm
Stack to Reach Ratio
1.33:1
Seat Tube Length, C-T
425mm
Top Tube Length, Effective/Horizontal HT Top
615mm
Head Tube Angle
65deg
Effective Seat Tube Angle, Unknown
77.2deg
Head Tube Length
120mm
Bottom Bracket Drop
42mm
Bottom Bracket Height
327.4mm
Chainstay Length
444mm
Chainstay Length Horizontal
442mm
Front-Center
799mm
Front-Center Horizontal
799mm
Wheelbase
1241mm
Fork Offset/Rake
44mm
Fork Length (On-Axis)
550mm
Trail
123.7mm
very high
Mechanical Trail
112.1mm
Wheel Flop
47.4mm
Standover Height
753mm
Tire to Pedal Spindle Distance
With 170 mm cranks
259.6mm
Pedal Spindle to Ground Clearance
With 170 mm cranks
157.4mm

Alloy (Low BB) Build

Wheel Size
700C, 29 inch (622mm BSD)
Tire Width
2.3in
Tire Outer Diameter
738.8mm
Bike Length with Tires
1979.8mm
Crank Length
170mm
Handlebar Width
780mm
Stem Length
50mm
Suspension Type
Full suspension
Bar Type
Flat Bar
Fork Travel
140mm
Rear Travel
Unknown
Suspension Sag
Unknown
Frame Material
Aluminum
Fork Material
Steel
Brake Type
Disc
Source:https://www.specialized.com/au/en/stumpjumper-alloy/p/175253?color=300705-175253&searchText=93321-7101