Specialized Stumpjumper 15 Alloy Mountain Bike 2025

About this bike

Stumpjumper 15 Alloy 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.


KINEMATICS PERFECTED: As the quintessential trail bike Stumpjumper 15 Alloy balances efficiency and optimal bump force management. For the anti-squat on Stumpjumper 15 Alloy we struck a balance between the previous Stumpjumper and Stumpjumper EVO as both had excellent pedaling characteristics.
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 Alloy 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 and any terrain. The head angle and bottom bracket can be fine-tuned for stability or clearance.
FORM FOLLOWS FUN: We can make a frame as stiff as we want but there’s such a thing as too stiff. To be one with the bike requires engineered compliance in the frame. We engineered the M5 Alloy chassis—front end rear end and the link between them—as a single unit that hits the stiffness target we established for trail riding.
WHEEL SIZE: All coil-sprung models come with mixed wheels.
WHEEL CHOICE: With our aftermarket link 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 on Stumpjumper 15 elevates downtube storage an innovation we pioneered.
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 programs to keep you on the trail. Our unbeatable lifetime no-questions-asked replacement suspension pivot bearings to the original owner is just one way we've got you covered.



All-new M5 alloy frame with SWAT door integration
Ride Dynamics tuned X-Fusion 02 Pro RL shock with adjustable rebound and lockout
RockShox Psylo Silver fork with Motion Control Damper
Reliable Shimano MT-420 4-piston brakes
12-speed Shimano Deore drivetrain
Lifetime replacement of suspension pivot bearings to the original owner








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


SWAT
SWAT internal downtube storage


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 15x110 axle 44mm offset S1:140mm of travel S2-S6:150mm of travel


Stem
Alloy Trail Stem 35mm bar bore


Handlebars
Specialized 6000 series alloy 6-degree upsweep 8-degree backsweep. S1-S2: 780 width 20mm rise: S3-S4: 800 width 30mm rise: S5-S6: 800 width 40mm rise


Grips
Specialized Trail Grips


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


SeatPost
TranzX Dropper remote SLR LE lever 34.9 S1: 125mm S2: 150mm S3: 170mm S4-S6: 200mm


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


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


Rear Derailleur
Shimano Deore M6100 12pd Shadow Plus


Shift Levers
Shimano Deore M6100 12spd


Cassette
Shimano Deore M6100 12spd w/Hyperglide+ 10-51t


Chain
Shimano Deore M6100 12-speed


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


Bottom Bracket
Threaded


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


Seat Binder
Alloy 38.6mm


Weight
S4 - 16.57 kg (36 lb 8.5 oz)



As with any product specification is subject to change without prior notification. You are advised to confirm current specification before buying.
Please note that this bike does not come with pedals.

Description supplied by Cyclestore.