Specialized Stumpjumper 15 Alloy Frameset FOX GENIE Performance Trail MTB

Specialized Stumpjumper 15 Alloy Frameset

M5 Alloy | FOX FLOAT GENIE Performance Shock | Trail MTB

The Specialized Stumpjumper 15 Alloy Frameset is built to eliminate compromises on the trail. Combining an all-new M5 alloy chassis with Specialized's revolutionary GENIE air spring technology, it delivers the traction and sensitivity of a coil shock, the bottom-out resistance of an air shock, and unmatched adjustability for every riding style.

Whether you're charging technical descents, flowing through singletrack, or climbing efficiently back to the top, the Stumpjumper 15 Alloy adapts to your terrain with six-way geometry adjustment, configurable wheel sizes, and SWAT™ integrated storage.

Available from Stage 21 Bikes, your trusted source for genuine Specialized bikes, frames, and performance upgrades.

Breakthrough Trail Performance

The Stumpjumper 15 Alloy combines:

• Big-bike confidence on descents
• Efficient climbing performance
• Playful handling
• Outstanding traction
• Extensive rider customization

This is the most adjustable Stumpjumper ever built.

GENIE Suspension Technology

At the heart of the Stumpjumper 15 Alloy is Specialized GENIE, a patent-pending air spring system that combines the advantages of coil and air suspension.

GENIE delivers:

• Coil-like small bump sensitivity
• Improved mid-stroke support
• Progressive end-stroke ramp-up
• Excellent bottom-out resistance
• Independent tuning of mid- and end-stroke support

Better Bump Management

Compared to a conventional air shock, GENIE provides:

• 16.3% better bump force management
• 57% more traction
• 39% fewer bottom-outs

The result is increased control, smoother suspension action, and more confidence on technical terrain.

Ride Dynamics Tuned FOX FLOAT Performance Shock

Included with the frameset:

• FOX FLOAT Performance Shock
• Specialized Ride Dynamics tune
• Integrated GENIE air spring technology
• Open/Firm two-position damper adjustment

Ride Your Way

The Stumpjumper 15 Alloy offers six distinct geometry configurations.

Adjustments include:

• Head tube angle
• Bottom bracket height
• Mixed-wheel compatibility
• Full 29-inch compatibility
• Tunable suspension progression

Customize the bike for aggressive descending, technical climbing, or all-around trail performance.

Wheel Choice

Compatible with:

• Full 29-inch wheels
• Mixed-wheel (29"/27.5") setup using aftermarket shock links

Geometry remains properly balanced regardless of wheel configuration.

SWAT™ Storage

Integrated SWAT™ downtube storage provides secure internal space for:

• Tools
• Tubes
• CO₂ cartridges
• Ride essentials

Durable M5 Alloy Construction

Features include:

• All-new M5 premium alloy frame
• Internal cable routing
• Integrated SWAT™ door
• Modern trail geometry
• Optimized stiffness and compliance

Lifetime Pivot Bearing Support

Specialized backs the Stumpjumper 15 Alloy with:

• Lifetime replacement suspension pivot bearings
• Original owner coverage
• Industry-leading long-term support

Frameset Specifications

Frame

• Specialized M5 Alloy
• Integrated SWAT™ storage
• Internal cable routing

Rear Shock

• FOX FLOAT Performance
• Specialized GENIE air spring
• Ride Dynamics tuned
• Two-position Open/Firm adjustment

Rear Travel

• 145mm

Geometry Highlights

Available Color & Part Numbers

Satin Obsidian / Silver Dust

Key Features

• All-new M5 alloy frame
• FOX FLOAT Performance shock
• Specialized GENIE air spring technology
• 145mm rear travel
• Six-way geometry adjustment
• Mixed-wheel compatibility
• Full 29er compatibility
• Integrated SWAT™ downtube storage
• Ride Dynamics suspension tuning
• Lifetime replacement pivot bearings for the original owner

Ideal For

• Technical trail riding
• All-mountain adventures
• Aggressive singletrack
• Endurance trail rides
• Riders seeking maximum adjustability
• Riders wanting coil-like suspension performance with air shock efficiency

Why Choose the Stumpjumper 15 Alloy Frameset?

The Specialized Stumpjumper 15 Alloy Frameset delivers trail performance without compromise. Its innovative GENIE suspension technology combines coil-like traction with progressive air spring support, while six-way geometry adjustment, mixed-wheel compatibility, and integrated SWAT™ storage let you tailor the bike to your riding style. Backed by Specialized's lifetime pivot bearing replacement policy for the original owner, it's built to handle years of demanding trail riding.

Specifications Summary