Overview
The Specialized Stumpjumper 15 is the standard version of Specialized’s iconic trail bike, running 150mm of front travel and 145mm of rear travel with the FACT 11m carbon frame and FOX FLOAT suspension with Specialized’s proprietary GENIE technology. Where the Stumpjumper 15 EVO adds a longer 160mm fork and slacker geometry for more aggressive riding, the standard Stumpjumper 15 keeps things balanced — a true do-it-all trail bike that climbs as well as it descends.
New to bike geometry? Our complete guide to mountain bike geometry explains every measurement and what it means for your riding. You can also learn how to read a geometry chart to compare this bike against other models.
Available in six sizes (S1 through S6) using Specialized’s Rider-First Engineered sizing, the Stumpjumper 15 Comp starts at $4,999 with SRAM S-1000 Eagle AXS and FOX Performance suspension. The S-Works model tops the range. At 32 lbs 12 oz (S4), it’s competitive for a 150mm trail bike. The bike uses 29″ wheels on all sizes except S1 which runs a mixed 29/27.5 setup. Specialized’s SWAT storage door in the downtube provides trailside tool access without a pack.
Geometry Diagram
Geometry Table
| Measurement | S1 | S2 | S3 | S4 | S5 | S6 |
|---|---|---|---|---|---|---|
| Seat Tube Length | 385mm | 385mm | 405mm | 425mm | 445mm | 465mm |
| Seat Tube Angle | 78° | 77° | 77° | 76.5° | 76.5° | 76.5° |
| Top Tube Length | 541mm | 573mm | 595mm | 624mm | 647mm | 677mm |
| Head Tube Length | 95mm | 100mm | 110mm | 125mm | 140mm | 155mm |
| Head Tube Angle | 64.5° | 64.5° | 64.5° | 64.5° | 64.5° | 64.5° |
| Fork Rake | 44mm | 44mm | 44mm | 44mm | 44mm | 44mm |
| Trail | 129mm | 130mm | 130mm | 130mm | 130mm | 130mm |
| Wheelbase | 1149mm | 1181mm | 1213mm | 1244mm | 1285mm | 1322mm |
| Chainstay Length | 430mm | 432mm | 435mm | 435mm | 445mm | 445mm |
| BB Height | 334mm | 337mm | 337mm | 337mm | 337mm | 337mm |
| Stack | 608mm | 618mm | 627mm | 640mm | 654mm | 667mm |
| Reach | 400mm | 425mm | 450mm | 475mm | 500mm | 530mm |
Geometry Analysis
The Stumpjumper 15’s geometry is identical to the EVO in terms of frame dimensions — the difference is the fork. The 64.5° head angle is progressive for a 150mm trail bike, matching what many enduro bikes ran just a few years ago. Seat tube angle varies by size from 78° (S1) to 76.5° (S4-S6), reflecting Specialized’s Rider-First approach where geometry scales with the rider rather than applying uniform angles. Reach spans from 400mm (S1) to 530mm (S6) in even 25-30mm increments — exceptionally well-distributed across the size range. Chainstays scale too: 430mm on S1, 435mm on S3-S4, and 445mm on S5-S6, providing proportional handling across all sizes. BB height of 337mm (most sizes) is moderate, balancing pedal clearance with a planted feel through corners.
Ride Characteristics
The Stumpjumper 15 rides like the quintessential modern trail bike. The 150mm/145mm travel package smooths out roots, rocks, and small drops without the weight or complexity of longer-travel platforms. The FOX FLOAT shock with GENIE technology provides a progressive, bottomless feel that resists harsh bottom-outs. Climbing is where the standard Stumpy pulls ahead of the EVO — the 150mm fork keeps the front end slightly higher and more planted on steep climbs. Descending, the 64.5° head angle and long reach provide genuine confidence in rough terrain. The bike encourages an active riding style — it rewards pumping, cornering, and line choice rather than just pointing and plowing. The SWAT door is a genuine trail advantage, letting you carry tubes and tools inside the frame.
Key Specs
Frame: FACT 11m carbon, 145mm rear travel. Fork: FOX FLOAT 36 Rhythm/Performance/Factory, 150mm (140mm S1). Shock: FOX FLOAT Performance/Factory with GENIE technology. Wheel Size: 29″ (29/27.5 mixed on S1). Sizes: S1, S2, S3, S4, S5, S6. Weight: 32 lbs 12 oz (S4). Drivetrain: SRAM S-1000/GX/X0/XX Eagle AXS. Brakes: SRAM Maven Bronze/Silver/Ultimate. Price: $4,999 (Comp) to $12,500 (S-Works).
What’s New vs Previous Generation
The Stumpjumper 15 represents the 15th generation of Specialized’s iconic trail bike. Key advances include the GENIE shock technology (exclusive to Specialized), which uses a position-sensitive damping system for improved small-bump sensitivity and bottom-out resistance. The Rider-First Engineered frame means each size gets unique tube shapes, carbon layups, and geometry rather than simply scaling a single design. SRAM’s new S-1000 Eagle AXS electronic shifting brings wireless shifting to the Comp level. The SWAT storage integration continues from previous generations.
Who Should Consider This Bike
The standard Stumpjumper 15 is the ideal choice for riders who split their time evenly between climbing and descending. If your trails are varied — mix of climbing, flowing singletrack, and moderate technical terrain — the Stumpy 15 does it all without compromise. Riders who want more aggressive descending capability should look at the Stumpjumper 15 EVO (160mm fork, slacker head angle) or the Enduro. Riders wanting less travel for XC-focused riding should consider the Epic 8 EVO.
Comparable Models
The Stumpjumper 15 competes with the Trek Fuel EX, Giant Trance X, Santa Cruz Hightower, Ibis Ripmo, Canyon Spectral, and Yeti SB140. The Fuel EX runs 140mm/130mm — slightly less travel. The Trance X matches at 140mm/150mm with mullet capability. The Hightower runs 145mm/140mm on full 29. The Stumpy’s advantages include the GENIE shock technology, SWAT storage, and the exceptional six-size range with Rider-First engineering.
Related Geometry
More Specialized geometry: Specialized Demo 2020 Geometry, Specialized Demo 2023 Geometry, Specialized Enduro 2020 Geometry, Specialized Enduro 2023 Geometry, Specialized Enduro 2026 Geometry.
Compare all mountain bikes: 2023 Yeti SB140 Geometry, Commencal Meta AM 29 2020 Geometry, Commencal Meta AM 29 2021 Geometry.
Frequently Asked Questions
What is the difference between the Stumpjumper 15 and the Stumpjumper 15 EVO?
Both share the same frame with 145mm rear travel. The standard Stumpjumper 15 runs a 150mm fork and 64.5° head angle. The EVO runs a longer 160mm fork, has a slacker head angle, and includes the SWAT head tube angle adjuster for geometry customization. The standard is the balanced trail bike; the EVO is the aggressive option.
What wheel size does the Stumpjumper 15 use?
The Stumpjumper 15 uses 29″ wheels on sizes S2-S6. The smallest size (S1) runs a mixed 29″ front / 27.5″ rear setup to maintain proportional handling for smaller riders.
How much does the Specialized Stumpjumper 15 cost?
The 2026 Stumpjumper 15 ranges from $4,999 for the Comp to approximately $12,500 for the S-Works model with top-tier FOX Factory suspension and SRAM XX Eagle AXS.
What is GENIE technology on the Stumpjumper?
GENIE is Specialized’s proprietary shock technology that uses a position-sensitive damping system within the FOX FLOAT shock. It provides improved small-bump sensitivity in the early stroke while offering progressive resistance to bottom-out, without the need for volume spacers or external adjustments.
What sizes does the Stumpjumper 15 come in?
The Stumpjumper 15 comes in six sizes: S1, S2, S3, S4, S5, and S6. This expanded size range covers riders from approximately 4’11” to 6’7″, with each size featuring unique geometry tuning through Specialized’s Rider-First Engineering.