Specialized Stumpjumper 15 EVO Expert - FACT 11m carbon, FOX Performance Elite w/ GENIE, GX Eagle AXS

Specialized Stumpjumper 15 EVO Expert 2026

The Specialized Stumpjumper 15 EVO Expert is a premium carbon trail bike for riders who want plenty of descending control without turning every trail ride into an enduro mission. Its FACT 11m carbon frame, FOX Performance Elite suspension, GENIE shock technology and SRAM GX AXS Transmission create a lightweight and highly adjustable bike that climbs efficiently and feels composed when the terrain becomes steep or rough.

Lightweight FACT 11m Carbon Frame

The FACT 11m carbon chassis and rear end keep the claimed weight to 14.61kg in size S4 while providing the strength and stiffness required for demanding trail riding. Specialized has tuned the complete frame structure to feel precise without becoming excessively harsh through rough sections.

A threaded bottom bracket, sealed cartridge-bearing pivots and SRAM UDH compatibility make the frame practical to service. Internal brake and dropper routing also keeps the bike tidy without placing every cable through the headset.

FOX 36 Performance Elite Control

The FOX FLOAT 36 Performance Elite fork provides 150mm of travel on size S1 and 160mm on sizes S2 to S6. Its GRIP X2 damper offers separate high- and low-speed compression and rebound adjustments, allowing experienced riders to tune the fork precisely for their weight, terrain and riding style.

The 36mm chassis provides accurate steering and useful support through steep sections, hard braking and repeated impacts.

GENIE Suspension Performance

The FOX FLOAT X Performance Elite shock uses Specialized GENIE technology to provide a supple feel through the early and middle parts of its travel, helping the rear wheel maintain contact across roots, rocks and braking bumps.

As the shock moves deeper into its travel, the spring rate becomes more progressive to provide support through larger compressions and reduce harsh bottom-outs. Low-speed compression and rebound adjustments allow the setup to be refined, while the two-position lever provides quick access to a firmer setting.

Adjustable Trail Geometry

Six geometry configurations allow riders to adjust the head angle and bottom-bracket height. A lower and slacker setup adds stability for steep, fast terrain, while a higher position provides more pedal clearance and a sharper feel on tighter trails.

Compatible aftermarket shock links also allow the bike to use either matching 29-inch wheels or a mixed-wheel setup with a 27.5-inch rear wheel while maintaining its intended geometry.

SRAM GX AXS Transmission

SRAM GX Eagle AXS Transmission provides wireless electronic shifting through an AXS Pod controller. The full-mount derailleur is designed to shift accurately under load, while the 10–52T cassette supplies a broad range for steep climbs and faster trail sections.

The removable AXS battery makes charging straightforward, while the direct-mount design removes the need for a conventional derailleur hanger.

Powerful Maven Braking

SRAM Maven Silver four-piston brakes provide the power required for steep and sustained descents. A 200mm front rotor delivers strong braking control, while the rear uses a 180mm rotor on S1–S2 and a 200mm rotor on S3–S6.

The high level of braking power means riders can control speed with less lever effort, helping reduce hand fatigue on longer descents.

Key Features

• Frame: FACT 11m carbon chassis and rear end
• Rear travel: 145mm
• Fork: FOX FLOAT 36 Performance Elite with GRIP X2 damper
• Fork travel: 150mm on S1 and 160mm on S2–S6
• Rear shock: FOX FLOAT X Performance Elite with Specialized GENIE technology
• Drivetrain: SRAM GX Eagle AXS Transmission
• Controller: SRAM AXS Pod
• Cassette: SRAM XG-1275 Transmission, 12-speed, 10–52T
• Brakes: SRAM Maven Silver four-piston hydraulic disc
• Front rotor: 200mm
• Rear rotor: 180mm on S1–S2 and 200mm on S3–S6
• Wheels: Roval Traverse alloy with DT Swiss 370 hubs
• Front tyre: Specialized Butcher GRID TRAIL T9, 29 x 2.4 inches
• Rear tyre: Specialized Eliminator GRID TRAIL T7, 2.4 inches
• Wheel setup: Mixed wheel on S1–S2 and full 29-inch on S3–S6
• Dropper post: PNW Loam with tool-free travel adjustment
• Geometry: Six adjustable configurations
• Storage: SWAT 4.0 internal downtube storage
• Frame standards: Threaded bottom bracket, Boost 12 x 148mm and SRAM UDH
• Drivetrain compatibility: Electronic drivetrains only
• Claimed weight: 14.61kg in size S4
• Frame support: Lifetime replacement suspension pivot bearings for the original owner, subject to Specialized’s terms

Why Riders Love the Specialized Stumpjumper 15 EVO Expert

The Specialized Stumpjumper 15 EVO Expert suits riders who want one high-quality trail bike for everyday singletrack, technical descents and long days in varied terrain. It combines a lightweight carbon frame with meaningful suspension, braking and drivetrain upgrades without moving into the cost of an S-Works build.

Balanced Trail Performance

Its 145mm rear travel and longer FOX 36 fork provide the control required for rough terrain while retaining the lively and efficient character expected from a Stumpjumper.

GENIE Suspension

The GENIE-equipped rear shock improves sensitivity and traction through smaller impacts while adding progressive support deeper in the travel.

Highly Adjustable Suspension

The FOX GRIP X2 damper and FLOAT X shock provide enough adjustment for riders who want to refine compression and rebound behaviour for different terrain.

Wireless Shifting

SRAM GX AXS Transmission provides precise electronic shifting without a cable running between the handlebar controller and rear derailleur.

Adjustable Handling

Six geometry settings and optional wheel configurations allow riders to prioritise stability, agility or pedal clearance.

Strong Braking Control

Maven Silver brakes and appropriately sized rotors provide the stopping power needed for steep, fast and sustained descents.

Premium Practicality

SWAT storage, a threaded bottom bracket, adjustable dropper travel and modern frame standards make the bike easier to own and adapt over time.

Who Is This Bike For?

Perfect For

✔ Technical trail riding
✔ Steep and rough descents
✔ All-day rides across varied terrain
✔ Riders wanting a lightweight carbon trail bike
✔ Riders who value detailed suspension adjustment
✔ Riders wanting SRAM AXS shifting
✔ Riders wanting adjustable geometry and wheel options
✔ Anyone seeking premium performance below flagship pricing

Our Thoughts on the Specialized Stumpjumper 15 EVO Expert

The Stumpjumper 15 EVO Expert is the model we would look at if you want the benefits of the carbon EVO platform with suspension and components that are already at a very high level. At 14.61kg it remains manageable on climbs, but it has the fork, shock and brakes needed for genuinely demanding trails.

The FOX 36 Performance Elite uses the same GRIP X2 damper found in more expensive fork packages, so the main difference is the finish rather than a major reduction in performance. The GENIE-equipped FLOAT X shock also gives the rear suspension a useful combination of traction, support and resistance to bottoming out.

SRAM GX AXS Transmission, Maven Silver brakes and Roval Traverse wheels leave little that needs changing from the outset. For riders who want a premium trail bike without paying extra for top-level carbon wheels or boutique finishing parts, the Expert is one of the strongest builds in the Stumpjumper 15 EVO range.

Why Buy from Chain Reaction?

✔ Official Specialized Dealer
✔ Professionally assembled, safety checked and workshop tuned before collection or dispatch
✔ Brakes professionally pre-bedded before collection or dispatch
✔ Suspension initially set according to rider weight
✔ Premium handover including bike setup, suspension adjustment, a complete feature walkthrough and practical maintenance advice
✔ Expert bike sizing and setup advice
✔ Lifetime workshop support from experienced mechanics
✔ Nationwide New Zealand delivery
✔ Finance and WorkRide options available

Geometry

The Stumpjumper 15 EVO Expert offers six geometry configurations through its adjustable head angle and bottom-bracket height. Geometry measurements vary according to frame size, wheel configuration and selected setting.

Contact Chain Reaction if you would like help understanding the geometry options or choosing a setup for your terrain.

Size Guide

• S1: Approximately 150–160cm
• S2: Approximately 157–173cm
• S3: Approximately 165–180cm
• S4: Approximately 173–188cm
• S5: Approximately 178–193cm
• S6: Approximately 188–203cm

Rider height is only a starting point. Body proportions, riding style and preferred handling can influence the ideal size, particularly where recommendations overlap. Contact Chain Reaction for personalised sizing advice.

Delivery and Assembly

Every Specialized Stumpjumper 15 EVO Expert purchased from Chain Reaction is professionally assembled, tuned and safety checked by our workshop.

Your bike receives:

• Complete professional assembly
• Full workshop safety inspection
• SRAM AXS drivetrain setup and firmware check
• Brakes professionally pre-bedded using our Sinter Smart bedding-in machine
• Fork and shock pressures initially set according to rider weight
• Compression and rebound controls checked
• Dropper-post travel and operation checked
• Geometry and wheel configuration checked
• Tubeless-ready wheels and tyre pressures checked
• Secure packaging for transport
• Nationwide New Zealand delivery
• Click & Collect where available

For nationwide delivery, the bike is securely packaged after its workshop inspection. Some minor final assembly is required after unpacking. Instructions are included, and the Chain Reaction team is available if assistance is needed.

Specifications are based on manufacturer information and may change without notice.

Frameset

• Frame: FACT 11m carbon chassis and rear end, Trail Geometry, SWAT Door integration, head-tube angle adjustment, threaded BB, internal brake and dropper cable routing, 12 x 148mm dropouts, sealed cartridge-bearing pivots, SRAM UDH compatible, 145mm travel
• SWAT: SWAT 4.0 internal downtube storage
• Seat binder: Alloy, 38.6mm

Suspension

• Fork: FOX FLOAT 36 Performance Elite, GRIP X2 damper, high- and low-speed rebound and compression adjustment, 15 x 110mm Kabolt axle, 44mm offset, S1: 150mm travel, S2–S6: 160mm travel
• Rear shock: FOX FLOAT X Performance Elite with Specialized GENIE Shock Tech, Ride Dynamics Trail Tune, two-position lever, LSC adjustment, LSR adjustment, 210 x 55mm

Brakes

• Front brake: SRAM Maven Silver, four-piston caliper, hydraulic disc, 200mm Centerline rotor
• Rear brake: SRAM Maven Silver, four-piston caliper, hydraulic disc; S1–S2: 180mm, S3–S6: 200mm Centerline rotor

Drivetrain

• Rear derailleur: SRAM GX Eagle AXS Transmission
• Shift lever: SRAM AXS Pod Controller with discrete clamp
• Cassette: SRAM XG-1275 Transmission, 12-speed, 10–52T
• Chain: SRAM GX Eagle Transmission 12-speed Flattop
• Crankset: SRAM GX Eagle, S1–S3: 165mm, S4–S6: 170mm, 32T ring, integrated guard, 55mm chainline
• Bottom bracket: SRAM DUB Threaded Wide

Wheels and Tyres

• Front wheel: Roval Traverse 29-inch rim, hookless alloy, 30mm internal width, tubeless ready, DT Swiss 370 hub, 15 x 110mm, 28-hole, Sapim Force spokes
• Rear wheel: Roval Traverse rim, hookless alloy, 30mm internal width, tubeless ready, DT Swiss 370 hub, 15 x 110mm, 28-hole, Sapim Force spokes
• Front tyre: Specialized Butcher, GRID TRAIL casing, Gripton T9 compound, 29 x 2.4 inches
• Rear tyre: Specialized Eliminator, GRID TRAIL casing, Gripton T7 compound, tubeless ready; S1–S2: 27.5 x 2.4 inches, S3–S6: 29 x 2.4 inches
• Inner tubes: Standard, Presta valve

Cockpit

• Handlebars: Specialized 6000-series alloy, 6-degree upsweep, 8-degree backsweep; S1–S2: 780mm width and 20mm rise; S3–S6: 800mm width and 50mm rise
• Stem: Alloy Trail Stem, 35mm bar bore
• Grips: Deity Lockjaw lock-on, 32mm outside diameter, 133mm length
• Saddle: Bridge Comp with hollow Cr-Mo rails; S1–S2: 155mm, S3–S6: 143mm
• Seatpost: PNW Loam Dropper with tool-free travel adjustment and Range lever, 34.9mm; S1: 125mm, S2: 150mm, S3: 175mm, S4–S5: 200mm, S6: 225mm

Product Details

• Product ID: 221478
• Model year: 2026
• Weight: 14.61kg
• Weight size: S4

Specialized Stumpjumper 15 Size Guide

The Stumpjumper 15 uses Specialized’s S-Sizing system. Instead of choosing a frame from height alone, S-Sizing allows many riders to choose between two sizes depending on whether they prefer a more agile bike or greater stability at speed.

Rider Height Recommended Size Traditional Equivalent Wheel Setup

S1 XS Mixed 29"/27.5"157–173cm

S2 Small Mixed 29"/27.5"165–180cm

S3 Medium 29-inch 173–188cm

S4 Large 29-inch 178–193cm

S5 XL29-inch 188–203cmS6XXL29-inch

How Specialized S-Sizing Works

The height ranges intentionally overlap. This gives many riders the option of choosing between two frame sizes based on their proportions, local terrain and preferred handling.

As a general starting point:

• S1 is similar to a traditional Extra Small
• S2 is similar to a traditional Small
• S3 is similar to a traditional Medium
• S4 is similar to a traditional Large
• S5 is similar to a traditional Extra Large
• S6 is similar to a traditional Extra Extra Large

Choose the Smaller Size If You Want:

• Quicker and more responsive handling
• A bike that is easier to move around on
• More confidence through tight corners
• A more playful feel on jumps and technical sections
• A shorter and more compact riding position

Choose the Larger Size If You Want:

• More stability at speed
• A roomier riding position
• Greater confidence through rough or steep terrain
• A longer wheelbase for high-speed descending
• More space for riders with longer arms or torsos

What If You Are Between Sizes?

If you sit within the overlap between two sizes, consider your body proportions as well as your riding style.

Riders with a longer torso or arms may feel more comfortable on the larger size. Riders with shorter arms, a shorter torso or a preference for agile handling may be better suited to the smaller option.

For example, a 178cm rider could potentially choose an S3, S4 or S5:

• S3 will feel compact and manoeuvrable
• S4 will provide the most balanced all-round fit
• S5 will feel longer and more stable at speed

Most riders should begin with the middle or traditionally equivalent size unless they have a clear preference for a more agile or more stable bike.

Wheel Size and Frame Size

The S1 and S2 use a mixed-wheel setup, with a 29-inch front wheel and 27.5-inch rear wheel. This provides the rollover ability of a larger front wheel while keeping the rear of the bike compact and easy to manoeuvre.

Sizes S3 through S6 use 29-inch wheels front and rear for stability, momentum and smoother performance over rough ground.

Standover height is useful, but it should not be used as the only measurement when choosing a Stumpjumper. Reach, arm length, riding position and handling preference are equally important.

Need Help Choosing Your Stumpjumper Size?

Contact the Chain Reaction team with your height, inside-leg measurement and current bike size. Let us know whether you prefer a more agile bike or greater stability, and we can help narrow down the best S-Size before you order.

Every Stumpjumper purchased from Chain Reaction is professionally assembled and safety checked, with expert suspension and setup advice available.

This guide applies to the 2026 Specialized Stumpjumper 15 range. It is intended as a starting point, as rider proportions, terrain and handling preferences can affect the best size.