Specialized Stumpjumper 15 Alloy

The Stumpjumper 15 Alloy obliterates every trade-off in the trail game. Devour bumps like a big bike? Check. Short-travel control, playfulness, and efficiency? Double check. And with a heaping helping of personalization, it’s tailored to the rider who matters most—you.

Highlights

Kinematics Perfected
The Stumpjumper 15 Alloy delivers optimal bump force management and efficiency. Its anti-squat balance strikes the perfect middle ground between previous Stumpjumper models and the Stumpjumper EVO, giving you excellent pedaling performance without sacrificing control.

Honed Geometry
Big bike capability meets nimble agility. Low bottom bracket, slack head tube angle, optimized fork offset, and a generous cockpit optimize traction, cornering, and stability in rough terrain. Efficient climbing and responsive handling make it feel at home on any trail.

Ride Your Way
Six geometry settings allow you to fine-tune the bike to your style and terrain. Adjust the head angle and bottom bracket to prioritize either stability or clearance, giving you the most personalizable trail bike experience ever.

Form Follows Fun
The M5 Alloy chassis balances stiffness and compliance for a playful yet controlled ride. Engineered as a single unit, front to rear, it hits the trail stiffness target while maintaining a lively, fun ride.

Wheel Choice
Coil-sprung models come with mixed wheels by default. Aftermarket link shock links allow you to choose big wheels front and rear or a 27.5” rear for a more playful, responsive ride—geometry remains unaffected.

Carry It All
Integrated SWAT downtube storage lets you carry tools and essentials without compromising frame performance.

More Relentless Than You
Built to endure years of hard riding, the Stumpjumper 15 Alloy comes with lifetime replacement suspension pivot bearings for the original owner, ensuring your bike stays trail-ready for years.

Technical Specifications

Frameset

Frame
M5 Alloy chassis and rear-end, Trail Geometry, SWAT™ Door integration, adjustable head tube angle, threaded BB, internal cable routing, 12x148mm dropouts, sealed cartridge bearing pivots, SRAM UDH compatible, 145mm travel

Seat Binder
Alloy, 38.6mm

Suspension

Rear Shock
X-Fusion 02 Pro RL, Ride Dynamics Trail Tune, rebound adjust, lockout
S1: 210x52.5mm
S2–S6: 210x55mm

Fork
RockShox Psylo Silver, Motion Control Damper, 15x110mm axle, 44mm offset
S1: 140mm travel
S2–S6: 150mm travel

Brakes

Front Brake
Shimano MT-420, 4-piston, hydraulic disc, 203mm

Rear Brake
Shimano MT-420, 4-piston, hydraulic disc
S1–S2: 180mm
S3–S6: 203mm

Drivetrain

Shift Levers
Shimano Deore M6100, 12-speed

Rear Derailleur
Shimano Deore M6100, Shadow Plus, 12-speed

Cassette
Shimano Deore M6100, 10–51t, Hyperglide+, 12-speed

Crankset
Shimano Deore M6120, 30T chainring, 55mm chainline
S1–S3: 165mm
S4–S6: 170mm

Chain
Shimano Deore M6100, 12-speed

Wheels & Tires

Rims
Specialized Alloy, Tubeless Ready, 29mm internal width, 28h
Front: 29"
Rear: S1–S2: 27.5", S3–S6: 29"

Front Hub
Alloy, sealed cartridge bearings, 15x110mm thru-axle, 28h

Rear Hub
Alloy, sealed cartridge bearings, 12x148mm thru-axle, 28h

Spokes
Stainless, 14g

Front Tire
Butcher, GRID TRAIL casing, GRIPTON® T9 compound, 2Bliss Ready, 29x2.3"

Rear Tire
Eliminator, GRID TRAIL casing, GRIPTON® T7 compound, 2Bliss Ready
S1–S2: 27.5x2.3"
S3–S6: 29x2.3"

Inner Tubes
Standard, Presta valve

Cockpit

Stem
Alloy Trail Stem, 35mm bar bore

Handlebars
Specialized 6000 series Alloy
S1–S2: 780mm width, 20mm rise
S3–S4: 800mm width, 30mm rise
S5–S6: 800mm width, 40mm rise
6° upsweep, 8° backsweep

Grips
Specialized Trail Grips

Saddle
Bridge, Steel rails
S1–S2: 155mm
S3–S6: 143mm

Seatpost
TranzX Dropper, remote SLR LE lever, 34.9mm
S1: 125mm
S2: 150mm
S3: 170mm
S4–S6: 200mm

Accessories

SWAT
Integrated downtube storage

Weight

Weight
16.57 kg (36 lb, 8.5 oz)
Measured Size: S4