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