Specialized Stumpjumper 15 Comp Alloy 2025 Mountain Bike

The Stumpjumper 15 Alloy takes the groundbreaking performance of the Stumpy platform and brings it to a robust, high-value alloy chassis without sacrificing capability. With GENIE shock technology delivering coil-like suppleness, improved traction, and exceptional bottom-out resistance, it rides like a bike with far more travel. Its balanced geometry provides stability in rough terrain, agility in tight sections, and efficiency on climbs—perfect for riders who demand versatility.

Personalization is at the core of the Stumpjumper 15 Alloy, offering six-way adjustable geometry, mixed-wheel compatibility, and a highly tunable suspension platform. Combined with SWAT storage integration, reliable components, and Specialized’s industry-leading durability support, it’s built to perform for years while letting riders tailor every ride to their style and terrain.

Key Features

• All-new M5 alloy frame with SWAT door integration


• Ride Dynamics tuned FOX FLOAT Performance shock with GENIE air-spring technology


• FOX FLOAT 36 Rhythm fork with GRIP damper for confident front-end control


• Durable Shimano SLX drivetrain paired with TRP Trail EVO 4-piston brakes


• Mixed-wheel or full-29" compatibility with six-way adjustable geometry

Specifications

Frameset

• 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


• Fork: FOX FLOAT 36 Rhythm, GRIP damper, two position Sweep adjustment, 15x110mm QR axle, 44mm offset, S1:140mm of travel, S2-S6:150mm of travel


• Rear Shock: FOX FLOAT Performance with Specialized GENIE Shock Tech, Ride Dynamics Trail Tune, 2-position lever w/ LSR adjustment, S1:210x52.5mm, S2-S6:210x55mm

Wheels

• Rims: Specialized, hookless alloy, 30mm inner width, tubeless ready, Front: 29, Rear: S1-S2: 27.5, S3- S6: 29


• Tyres: Front: Butcher, GRID TRAIL casing, GRIPTON® T9 compound, 2Bliss Ready, 29x2.3. Rear: Eliminator, GRID TRAIL casing, GRIPTON® T7 compound, 2Bliss Ready, S1-S2: 27.5x2.3, S3- S6: 29x2.3

Drivetrain

• Crankset: Shimano SLX, M7120, 32T ring, 55mm chainline, S1-S3:165mm, S4-S6: 170mm


• Shifters: Shimano SLX, M7100, 12spd


• Rear Derailleur: Shimano SLX, M7100, SGS, 12-speed


• Chain: Shimano SLX, M7100, 12-speed


• Cassette: Shimano SLX, CS-M7100, 12-speed, 10-51t

Components

• Handlebar: 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


• Stem: Alloy Trail Stem, 35mm bar bore


• Grips: Specialized Trail Grips


• Brakes: TRP Trail EVO, 4-piston caliper, hydraulic disc, 203mm


• Saddle: Bridge Comp, Hollow Cr-mo rails, S1-S2: 155mm, S3-S6: 143mm


• Seatpost: X-Fusion Manic, infinite adjustable, two-bolt head, bottom mount cable routing, remote SLR LE lever, 34.9, S1: 125mm, S2: 150mm, S3: 170mm, S4-S6: 190mm

Specialized Stumpjumper Sizing

Product code: 910481