2021 Specialized Bicycles Stumpjumper Base 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 | 632mm |
| Reach | 475mm |
| Stack to Reach Ratio | 1.33:1 |
| Seat Tube Length, Unknown | 425mm |
| Top Tube Length, Effective/Horizontal Center | 632mm |
| Top Tube Slope | 20.8deg |
| Head Tube Angle | 65deg |
| Seat Tube Angle | 76deg |
| Head Tube Length | 120mm |
| Bottom Bracket Drop | 42mm |
| Bottom Bracket Height | 327.4mm |
| Chainstay Length | 432mm |
| Chainstay Length Horizontal | 430mm |
| Front-Center | 800mm |
| Front-Center Horizontal | 798.1mm |
| Wheelbase | 1228mm |
| Fork Offset/Rake | 44mm |
| Fork Length, Unknown | 550mm |
| Trail | 123.7mm very high |
| Mechanical Trail | 112.1mm |
| Wheel Flop | 47.4mm |
| Standover Height | 749mm |
| Tire to Pedal Spindle Distance With 170 mm cranks | 260.6mm |
| Pedal Spindle to Ground Clearance With 170 mm cranks | 157.4mm |
Base Build
| Wheel Size | 700C, 29 inch (622mm BSD) |
| Tire Width | 2.3in |
| Tire Outer Diameter | 738.8mm |
| Bike Length with Tires | 1966.8mm |
| Crank Length | 170mm |
| Handlebar Width | 780mm |
| Stem Length | 50mm |
| Suspension Type | Full suspension |
| Bar Type | Flat Bar |
| Fork Travel | 140mm |
| Rear Travel | 130mm |
| Suspension Sag | Unknown |
| Frame Material | Carbon/Composite |
| Fork Material | Unknown |
| Brake Type | Disc |
Source:https://www.specialized.com/us/en/s-works-stumpjumper/p/175248?color=281582-175248&searchText=93321-0001