SPECIALIZED STUMPJUMPER 15 ALLOY

The SPECIALIZED Stumpjumper 15 Alloy is the trail bike designed to tackle any path without compromise. It combines climbing efficiency, control on technical descents, and agile handling on the narrowest trails. Thanks to the new M5 Alloy frame, evolved kinematics, and fully adjustable geometry, this mountain bike offers high-level performance and exceptional versatility.

Perfect for riders seeking a modern trail bike capable of adapting to various terrains and riding styles, the Stumpjumper 15 Alloy combines advanced technology, reliability, and pure fun on the trails.

Refined Kinematics

The new Stumpjumper 15 Alloy has been designed to offer an ideal balance between pedaling efficiency and shock absorption. The suspension kinematics were developed by seeking the sweet spot between the previous Stumpjumper and Stumpjumper EVO, both renowned for their excellent pedaling capability.

The result is an extremely efficient trail bike on climbs, yet equally capable of handling impacts and technical descents with great confidence.

Modern Geometry and Total Control

The geometry of the Stumpjumper 15 Alloy ensures stability at high speeds and agility in the most technical sections. The spacious cockpit positions the rider perfectly at the center of the bike, improving traction and cornering control.

The low bottom bracket, slack head tube angle, and optimized fork offset contribute to a stable and precise ride even on the most demanding terrain.

Fully Adjustable Geometry

The Stumpjumper 15 Alloy is one of the most customizable trail bikes ever. Thanks to the geometry adjustment system, it is possible to choose between six different configurations.

The head tube angle and bottom bracket height can be modified to adapt the bike to your riding style and terrain type, shifting from a more stable configuration to a more responsive and agile one.

Frame Designed for Trail Riding

The M5 Alloy frame has been developed to offer the right balance between stiffness and flexibility. The structure integrates the front triangle, rear triangle, and suspension link into a system designed to ensure precise handling and comfort on the longest trails.

Furthermore, the SWAT™ Door storage compartment integrated into the downtube allows you to carry tools and accessories directly inside the frame.

Configurable Wheels

The Stumpjumper 15 Alloy allows you to choose the wheel configuration best suited to your riding style. You can use 29" wheels on both ends or opt for a mullet configuration with a 27.5" rear wheel for a more playful and responsive ride, while keeping the bike's geometry unchanged.

Long-Term Reliability

Like all SPECIALIZED full-suspension mountain bikes, the Stumpjumper 15 Alloy is engineered to withstand years of trail use. Furthermore, Specialized provides the original purchaser with a lifetime supply of rear suspension pivot bearings, ensuring long-term durability and reliability.

Technical Specifications:

Frame

Frame
M5 Alloy chassis and rear-end, Trail Geometry, SWAT™ Door integration, head angle adjustment, threaded bottom bracket, internal cable routing, 12x148 mm dropouts, sealed bearing pivots, SRAM UDH compatible, 145 mm travel

SWAT
SWAT internal downtube storage

Seat Collar
Alloy, 38.6 mm

Suspension

Fork
RockShox Psylo Silver, Motion Control Damper, 15x110 mm axle, 44 mm offset
S1: 140 mm travel
S2-S6: 150 mm travel

Rear Shock
X-Fusion 02 Pro RL, Ride Dynamics Trail Tune, rebound and lockout adjustment
S1: 210x52.5 mm
S2-S6: 210x55 mm

Brakes

Front Brake
Shimano BR-MT420, 4-piston caliper, 203 mm hydraulic disc

Rear Brake
Shimano BR-MT420, 4-piston caliper
S1-S2: 180 mm
S3-S6: 203 mm

Drivetrain

Shifters
Shimano Deore M6100, 12-speed

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

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

Chain
Shimano Deore M6100, 12-speed

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

Wheels

Rims
SPECIALIZED Alloy, Tubeless Ready, 29 mm internal width, 28 holes
Front: 29"
Rear: S1-S2 27.5", S3-S6 29"

Front Hub
Alloy, sealed bearings, 15x110 mm thru-axle, 28h

Rear Hub
Alloy, sealed bearings, 12x148 mm thru-axle, 28h

Spokes
Stainless steel 14g

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

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

Inner Tubes
Standard, Presta valve

Cockpit

Handlebar
SPECIALIZED 6000 series alloy
6° upsweep, 8° backsweep
S1-S2: 780 mm, 20 mm rise
S3-S4: 800 mm, 30 mm rise
S5-S6: 800 mm, 40 mm rise

Stem
Alloy Trail Stem, 35 mm diameter

Grips

SPECIALIZED Trail Grips

Seatpost / Saddle

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

Saddle
SPECIALIZED Bridge, steel rail
S1-S2: 155 mm
S3-S6: 143 mm