Specialized Stumpjumper 15 EVO Expert AXS 2026

Stumpjumper 15 EVO is here to obliterate every trade-off in the trail game. Devour bumps like a big bike? Check. Short-travel control, playfulness, and efficiency? Double check. How about a heaping helping of personalization to make it perfect for the only rider who really matters—you?  Check, check, check.

BREAKTHROUGH CAPABILITY: GENIE Shock Technology combines a poppy, playful ride with a bottomless DH feel.

ULTIMATE CONTROL: Measurably better traction than “Bike of the Year” Stumpjumper EVO.

UNMATCHED PERSONALIZATION: Six-way geometry adjustment, mixed wheel or 29”, tunable spring curve, and more.

GENIE—The Magic Carpet Ride: The biggest innovation on the Stumpjumper 15 is GENIE. This patent-pending air spring technology that we invented grants every trail rider’s three wishes: the feel and control of a coil spring, better bottom-out prevention than a standard air spring, and a tunable “platform” for a playful feel.

ILLUMINATING GENIE: GENIE combines the control-enhancing linear spring rate of a coil spring through the “bump zone” with the progressive spring rate of an air spring at the end of the stroke to avoid bottom-outs. Truly, it's the best of both worlds – coil and air – with extra tunability. Say goodbye to compromises and hello to the future of riding.

WHAT BUMP?: With 16.3% better bump force management than a traditional air-sprung shock, GENIE makes the Stumpy 15 ride like a bike with more travel. For example, the Stumpjumper 15 (with 145 mm rear wheel travel) and our Enduro (170 mm travel) both use 101 mm of travel to absorb a 1080 N bump force.

TRACTION GALORE: Extensive field testing proves that Stumpjumper 15 with GENIE delivers 57% better traction than a standard air-sprung shock because GENIE technology gives you supple, coil-like performance, which keeps the wheel in contact with the ground a greater percent of the time than a typical air spring would.

BYE, BYE, BOTTOM-OUTS: 39% fewer bottom-outs than a standard air spring. During big hit events, you benefit from the rising rate in the last 30% of the GENIE stroke. Because of this two-stage, pronounced rising rate, GENIE reduces the frequency and severity of bottom-outs.

HONED GEOMETRY: This bike’s geometry delivers big bike capability when you need it, a nimble feel in tight sections, and lively, efficient climbing manners. The generous cockpit centers you on the bike, optimizing traction and corner control. The low bottom bracket, slack head tube angle, and optimized fork offset keep things stable in the rough.

RIDE YOUR WAY: The Stumpjumper 15 seamlessly integrates benchmark geo adjustability, making it the most personalizable trail bike ever. Six distinct geometry settings allow you to hone performance for any style, any terrain. Head angle and bottom bracket height can be fine-tuned for stability or clearance.

WHEEL CHOICE: With our aftermarket shock links, you can choose between big wheels front and rear or mix things up with a 27.5” rear for a more responsive and playful ride. No matter what you choose, geometry is unaffected.

CARRY IT ALL: SWAT 4.0 on Stumpjumper 15 elevates downtube storage, an innovation we pioneered. It’s the smoothest operating, most weather-resistant, flush-mounted system ever.

MORE RELENTLESS THAN YOU: Our full suspension bikes are built to be relentless, designed to endure years of hard riding and backed by the best support and policies to keep you on the trail. Our unbeatable lifetime, no-questions-asked replacement of suspension pivot bearings to the original owner is just one way we've got you covered.

• Lightweight FACT 11m carbon chassis and rear-end
• Ride Dynamics tuned FOX FLOAT X Performance Elite with Specialized GENIE Shock Tech. Highly adjustable 2-position open and firm mode with the 3-position open mode compression adjuster
• Supportive and tuneable FOX FLOAT 36 Performance Elite fork with GRIP X2 damper
• Strong and trusted Roval Traverse wheels, DT Swiss 370 hub
• Smooth and precise SRAM GX Eagle T-Type AXS drivetrain
• Powerful and reliable SRAM Maven Silver 4-piston brakes
• Adjustable travel with PNW LOAM dropper post
• Lifetime replacement of suspension pivot bearings to the original owner
• Compatible with electronic drivetrains only

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.