Overview
The 2026 Specialized Stumpjumper 15 marks the most significant evolution of this iconic trail bike in years. For MY26, the Stumpjumper lineup is exclusively EVO — the standard Stumpjumper is gone. Every model now ships with a 160mm fork and the new FOX FLOAT X GENIE rear shock delivering 145mm of rear travel. The result is a bike that blurs the line between aggressive trail and enduro, built for riders who want one bike that handles everything from technical climbs to rowdy descents.
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–S6) with Specialized’s size-specific chainstay lengths and mixed wheel options on smaller frames, the Stumpjumper 15 EVO continues to offer the six-way geometry adjustment system via press-in headset cups. Build kits range from the $2,200 alloy Deore build to the $11,300 S-Works XTR Di2, with carbon and alloy frame options throughout.
Geometry Diagram
Geometry Table
| S1 | S2 | S3 | S4 | S5 | S6 | |
|---|---|---|---|---|---|---|
| Reach | 400mm | 420mm | 445mm | 470mm | 495mm | 525mm |
| Stack | 611mm | 621mm | 630mm | 644mm | 658mm | 671mm |
| Head Tube Angle | 64° | 64° | 64° | 64° | 64° | 64° |
| Seat Tube Angle | 77.7° | 76.5° | 76.5° | 76° | 76° | 76° |
| Head Tube Length | 95mm | 100mm | 110mm | 125mm | 140mm | 155mm |
| Seat Tube Length | 385mm | 385mm | 405mm | 425mm | 445mm | 465mm |
| Chainstay Length | 430mm | 432mm | 435mm | 435mm | 445mm | 445mm |
| Wheelbase | 1153mm | 1186mm | 1217mm | 1249mm | 1290mm | 1327mm |
| Front Center | 724mm | 755mm | 785mm | 816mm | 848mm | 884mm |
| BB Height | 337mm | 340mm | 340mm | 340mm | 340mm | 340mm |
| BB Drop | 38mm | 35mm | 35mm | 35mm | 35mm | 35mm |
| Trail | 133mm | 134mm | 134mm | 134mm | 134mm | 134mm |
| Fork Length (full) | 561mm | 573mm | 573mm | 573mm | 573mm | 573mm |
| Fork Rake/Offset | 44mm | 44mm | 44mm | 44mm | 44mm | 44mm |
| Top Tube Length | 542mm | 574mm | 596mm | 625mm | 649mm | 678mm |
| Standover Height | 738mm | 751mm | 745mm | 745mm | 745mm | 751mm |
| Max Seatpost Insertion | 245mm | 245mm | 255mm | 255mm | 285mm | 285mm |
| Crank Length | 165mm | 165mm | 165mm | 170mm | 170mm | 170mm |
| Handlebar Width | 780mm | 780mm | 800mm | 800mm | 800mm | 800mm |
| Stem Length | 40mm | 40mm | 40mm | 40mm | 40mm | 40mm |
| Saddle Width | 155mm | 155mm | 143mm | 143mm | 143mm | 143mm |
| Seatpost Travel | 125mm | 150mm | 175mm | 200mm | 200mm | 225mm |
Size Guide
Specialized uses their S1–S6 sizing system rather than traditional S/M/L designations. The Stumpjumper 15 EVO covers a wide rider range with 125mm of reach spread from the S1 (400mm) to S6 (525mm). Size-specific chainstay lengths — 430mm on S1, scaling to 445mm on S5/S6 — help maintain balanced handling proportions across the range rather than using a one-length-fits-all approach.
Smaller frames (S1–S2) get a 27.5″ rear wheel paired with a 29″ front for improved standover and maneuverability, while S3–S6 run full 29″ wheels. With 200mm+ dropper posts available from S4 up and a generous max seatpost insertion across all sizes, there’s plenty of room for aggressive saddle positioning.
| Size | Rider Height (approx.) | Reach | Chainstay | Wheelbase | Rear Wheel |
|---|---|---|---|---|---|
| S1 | 5’0″–5’4″ | 400mm | 430mm | 1153mm | 27.5″ |
| S2 | 5’4″–5’8″ | 420mm | 432mm | 1186mm | 27.5″ |
| S3 | 5’7″–5’11” | 445mm | 435mm | 1217mm | 29″ |
| S4 | 5’10″–6’1″ | 470mm | 435mm | 1249mm | 29″ |
| S5 | 6’0″–6’3″ | 495mm | 445mm | 1290mm | 29″ |
| S6 | 6’3″–6’6″ | 525mm | 445mm | 1327mm | 29″ |
Ride Characteristics
The defining geometry story of the 2026 Stumpjumper is the full commitment to EVO. With a 64° head tube angle across all sizes, this bike sits a full degree slacker than the outgoing standard Stumpjumper — and that degree translates to meaningfully more confident descending, especially on steep, loose terrain where front wheel traction matters most.
The 134mm of trail (133mm on S1) is substantial. For context, many dedicated enduro race bikes run less trail than this. Combined with the 44mm fork offset, the front end is engineered to track predictably at speed through rough terrain. Riders coming from cross-country-leaning trail bikes will notice the steering is less twitchy at pace — the bike wants to hold a line rather than dart around. At low speed on tight switchbacks, that stability means you’ll need to be more deliberate with steering inputs.
The 35mm BB drop (38mm on S1) gives a low center of gravity that plants the bike in corners, but won’t have you constantly clipping pedals on rocky trails. The reach numbers are moderate by current standards — 470mm on the S4 puts it right in the sweet spot between the stretched-out race geometry of bikes like the Trek Fuel EX and the more compact cockpit of a Santa Cruz 5010. This is a bike that pedals efficiently uphill without feeling like you’re reaching for the bars on long climbs.
The size-specific chainstay lengths deserve attention. At 430–445mm depending on frame size, the rear end is short enough to keep the bike playful and easy to manual, while growing proportionally to maintain that balanced weight distribution on larger frames. The S5/S6 at 445mm won’t feel as snappy as the smaller sizes, but the longer wheelbase (1290–1327mm) provides the stability that taller riders need at speed.
Overall, the geometry says “aggressive trail bike that can pinch-hit for enduro duty.” The 64° HTA and 160mm fork are firmly in enduro territory, while the 145mm rear travel and efficient pedaling position keep it from being a pure gravity sled. For BC-style riding with long climbs and rowdy descents, this is a near-ideal geometry package.
Suspension & Kinematics
The big story for MY26 is the FOX FLOAT X GENIE rear shock, which is exclusive to Specialized. The GENIE technology uses a progressive air spring design that delivers a linear spring rate through the initial bump zone for small-bump sensitivity, then ramps up progressively deeper in the stroke to resist bottoming. Think of it as a self-adjusting volume spacer — you get plush trail comfort without sacrificing bottom-out resistance on big hits.
With 145mm of rear travel and the GENIE’s progressive nature, the Stumpjumper should handle everything from choppy rock gardens to gap jumps without needing constant shock tuning. The 160mm FOX 36 fork up front (sized down to a shorter axle-to-crown on S1 for proportional fit) provides a balanced front-to-rear travel split that favors descending confidence without making the bike feel over-forked on mellower trails.
The six-way geometry adjustment system uses interchangeable headset cups that allow ±1° of head angle change, effectively giving you three head angle settings between 63° and 65°. Combined with the flip chip for high/low BB positions, you can tune the bike from a slack enduro setup to a steeper, more nimble trail configuration depending on your local terrain.
What’s New for 2026
The most significant change is the elimination of the standard (non-EVO) Stumpjumper. For MY26, every Stumpjumper 15 is an EVO, meaning every model gets the 160mm fork (up from 150mm on the outgoing standard model), the GENIE shock, and the full adjustable geometry system. This simplifies the lineup and pushes the entire range toward more capable terrain.
Compared to the MY25 Stumpjumper 15 EVO, the geometry changes are subtle but meaningful. The head angle has slackened by approximately 0.5° to a uniform 64° across all sizes. The seat tube angle has steepened slightly on the S1 (now 77.7° vs. approximately 77° previously), improving climbing efficiency for smaller riders. Chainstay lengths remain close to the previous generation but with slight refinements at the size-specific boundaries.
The FOX FLOAT X GENIE shock replaces the standard FLOAT X on all builds, previously this was reserved for higher-tier models. Dropper post travel has also increased, with 225mm now available on the S6 frame. The SWAT internal storage system has been updated to version 4.0, and all builds now use Roval Traverse wheels with 30mm internal width hookless rims as standard.
Key Specs
| Spec | Detail |
|---|---|
| Rear Travel | 145mm |
| Fork Travel | 160mm (150mm on S1) |
| Rear Shock | FOX FLOAT X GENIE |
| Fork | FOX 36 (Performance to Factory depending on build) |
| Wheel Size | 29″ (S1-S2: 27.5″ rear / 29″ front) |
| Frame Material | FACT 11m Carbon or Alloy |
| Drivetrain | Shimano Deore to SRAM XX AXS / Shimano XTR Di2 |
| Brakes | SRAM Maven / Shimano XT/XTR 4-piston |
| Weight (S4) | 14.6 kg / 32.2 lb (Expert build) |
| Dropper | PNW LOAM (125–225mm travel by size) |
| Internal Storage | SWAT 4.0 |
| Geometry Adjust | 6-way (±1° HTA via headset cups + flip chip) |
Build Kits & Pricing
| Model | Drivetrain | Suspension | Price (USD) |
|---|---|---|---|
| Stumpjumper 15 EVO Alloy (Deore) | Shimano Deore | RockShox / X-Fusion | $2,200 |
| Stumpjumper 15 EVO Comp Alloy | Shimano SLX | FOX Rhythm | $2,800 |
| Stumpjumper 15 EVO Comp | SRAM S-1000 AXS | FOX Performance | $3,700 |
| Stumpjumper 15 EVO Alloy Comp | SRAM Eagle 70 | FOX Rhythm | $4,000 |
| Stumpjumper 15 EVO Expert (GX) | SRAM GX AXS | FOX Perf. Elite | $6,200 |
| Stumpjumper 15 EVO Expert (XT) | Shimano XT Di2 | FOX Perf. Elite | $6,200 |
| Stumpjumper 15 EVO Pro | SRAM X0 AXS | FOX Factory | $8,000 |
| S-Works Stumpjumper 15 EVO | Shimano XTR Di2 | FOX Factory | $11,300 |
Geometry Analysis
The Stumpjumper 15 EVO’s geometry reflects Specialized’s aggressive approach to modern trail bike design. The 64° head angle in the default setting places it firmly in the “aggressive trail” category — slacker than most XC-oriented trail bikes but not quite as slack as dedicated enduro machines. With the adjustable headset cups, riders can push this to 63° for a more gravity-biased setup or steepen to 65° for snappier climbing and tighter switchbacks.
Reach figures span from 430mm (S1) to 510mm (S6), following Specialized’s S-Sizing philosophy of proportional scaling rather than simply stretching the top tube. The chainstay lengths are size-specific at 430-445mm, which is relatively short for this travel class and contributes significantly to the bike’s playful, poppy character. Stack heights grow progressively from 598mm to 668mm across the size range, ensuring comfortable cockpit positions without excessive spacer stacks.
The 37mm BB drop provides a low center of gravity for cornering confidence while maintaining adequate pedal clearance for technical terrain. Combined with the 51mm offset fork, trail figures land around 120mm — providing stable, predictable steering that inspires confidence in steep, loose terrain without feeling sluggish on mellower trails.
Who Should Consider This Bike
The Stumpjumper 15 EVO is built for riders who want a single bike that handles the widest possible range of trail riding. If you ride steep, technical singletrack and want a bike that descends with confidence but still climbs efficiently, the Stumpy EVO delivers. The six-way geometry adjustment makes it particularly appealing for riders who want to experiment with setup or who ride diverse terrain — from mellower flow trails to aggressive natural terrain — and want to optimize for each.
This bike suits intermediate to advanced riders who push the limits of trail riding. Riders who want maximum descending capability should look at the Specialized Enduro, while those who prioritize climbing and efficiency might prefer the standard Stumpjumper 15 (non-EVO). The EVO hits the sweet spot between these two extremes.
Comparable Models
The Stumpjumper 15 EVO competes directly with aggressive trail bikes like the Trek Fuel EX Gen 7, Santa Cruz 5010 (or Bronson for mullet), YT Jeffsy, Norco Sight, and Rocky Mountain Instinct. Among these, the Stumpjumper’s six-way geometry adjustment is a standout feature — most competitors offer only a simple flip chip with two positions. The Trek Fuel EX Gen 7’s modular platform (convertible to MX or LX configurations) is the closest in terms of versatility. The Santa Cruz 5010 offers similar travel but with VPP suspension. The YT Jeffsy provides strong value as a direct-to-consumer alternative with comparable geometry.
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 head angle of the Specialized Stumpjumper 15?
The 2026 Stumpjumper 15 EVO has a 64 degree head tube angle across all six sizes (S1-S6) in its default setting. However, the six-way geometry adjustment system allows you to change this by plus or minus 1 degree using interchangeable headset cups, giving you a range of approximately 63 to 65 degrees depending on configuration. This is roughly 1 degree slacker than the outgoing standard (non-EVO) Stumpjumper, which ran a 65 degree head angle.
Is the Specialized Stumpjumper a trail or enduro bike?
The 2026 Stumpjumper 15 EVO sits at the aggressive end of the trail bike category, blurring into enduro territory. With 160mm of front travel, 145mm rear, and a 64 degree head angle, its geometry numbers overlap with many dedicated enduro bikes. Specialized officially categorizes it as a trail bike, but the EVO-only lineup for 2026 pushes it firmly toward the “do everything” end of the spectrum — capable of racing enduro stages while still pedaling efficiently on all-day rides.
What is the geometry of the Stumpjumper Comp?
For 2026, every Stumpjumper 15 — including the Comp builds — shares identical geometry. The Comp SRAM S-1000 AXS ($3,700) and Comp Alloy Shimano SLX ($2,800) use the same frame dimensions as the Pro and S-Works models: 64 degree head angle, 76-77.7 degree seat tube angle (size-dependent), 430-445mm chainstays, and reach ranging from 400mm (S1) to 525mm (S6). The difference between build levels is components only, not frame geometry.
What is the Specialized Stumpjumper designed for?
The Stumpjumper is designed as an all-around mountain bike built for technical trail riding. For 2026, Specialized has pushed the platform further toward aggressive terrain capability with the EVO-only approach: 160mm fork, 145mm rear travel, and adjustable geometry that can be configured from a fast trail setup to a near-enduro configuration. It is intended for riders who want one bike that handles technical climbs, flowy singletrack, and rowdy descents without needing separate bikes for each discipline.
What size Stumpjumper should I get?
Specialized uses their S1-S6 sizing system based on reach rather than traditional S/M/L labels. As a general guide: S1 fits riders around 5 foot 0 to 5 foot 4, S2 for 5 foot 4 to 5 foot 8, S3 for 5 foot 7 to 5 foot 11, S4 for 5 foot 10 to 6 foot 1, S5 for 6 foot 0 to 6 foot 3, and S6 for 6 foot 3 to 6 foot 6. If you are between sizes, consider your riding style — sizing up adds stability at speed, while sizing down gives more nimble handling. Note that S1 and S2 run a 27.5 inch rear wheel (mullet setup), while S3-S6 are full 29 inch.
How does the 2026 Stumpjumper compare to the 2023 model?
The 2026 Stumpjumper 15 EVO is a significant departure from the 2023 model. The standard Stumpjumper no longer exists — every 2026 model is an EVO. Key geometry changes include a slacker head angle (64 degrees vs. 65 degrees on the 2023 standard), more rear travel (145mm vs. 130mm), a longer fork (160mm vs. 150mm), and the addition of the FOX FLOAT X GENIE shock across all builds. Reach numbers have been slightly tightened, and dropper post travel has increased significantly, with up to 225mm on the S6.
Verdict
The 2026 Stumpjumper 15 EVO is Specialized’s clearest statement yet about where trail bikes are heading: more travel, slacker geometry, and the capability to handle terrain that used to require a dedicated enduro bike. By consolidating the lineup under the EVO banner, Specialized is acknowledging what most riders already knew — the adjustable, more aggressive platform was the one people actually wanted.
The geometry is well-executed. The 64° head angle provides genuine descending confidence without making the bike feel sluggish on flatter trails. The size-specific chainstays keep handling balanced across the range, and the six-way geometry adjustment means you can dial the bike in for anything from XC-adjacent trail riding (65° HTA setting) to mini-enduro duties (63°). If the GENIE shock delivers on its promise of better small-bump sensitivity with progressive bottom-out support, this could be the best do-everything trail bike on the market.
The main competition comes from the Trek Fuel EX (similar travel, slightly steeper geometry), the Santa Cruz Hightower (longer chainstays, more playful suspension feel), and the YT Jeffsy (aggressive pricing, comparable specs). The Stumpjumper’s edge is its adjustability — no other bike in this category offers six distinct geometry settings out of the box.