Specialized Stumpjumper 15 Comp Alloy – The “Best in Test” Trail Bike with GENIE Technology

Discover the Specialized Stumpjumper 15 Comp Alloy, the ultimate trail mountain bike that redefines performance on every terrain. Built on a robust and innovative M5 alloy frame, it integrates the patented GENIE suspension, offering a smooth, precise, and customizable ride like no other.

Officially the Best Trail Bike of the Year

The Stumpjumper 15 was voted “Best in Test” by Enduro Mountainbike Magazine, surpassing the most advanced trail bikes of 2025. An award that rewards the winning combination of handling, versatility, and GENIE suspension, making it the perfect bike for those who want to dominate any trail.

Strengths of the Specialized Stumpjumper 15 Comp Alloy

GENIE Technology – The Suspension of the Future

The suspension GENIE revolutionizes the trail bike category, combining the progression of an air spring and the sensitivity of a coil spring:

• +16.3% efficiency in impact management

• +57% traction compared to a traditional air shock

• -39% end stroke events, even on big impacts

Optimized Trail Geometry

The frame geometry is designed to ensure:

• Descending stability

• Climbing efficiency

• Agility on technical sections
  With a wide cockpit, low bottom bracket, and slack head angle, this bike offers maximum control in every situation.

Maximum Customization

Thanks to six geometry configurations, the Stumpjumper 15 perfectly adapts to your style:

• Adjust head angle and bottom bracket height

• Choose between 29" front and rear wheels, or mullet (27.5" rear) for a more responsive ride

SWAT™ 4.0 – Carry Everything With You

The innovative integrated SWAT™ storage system in the down tube lets you carry tools, snacks, or gear, eliminating the need for backpacks or additional bags.

Technical Specifications

Frame

• Material: M5 Alloy with matched rear triangle

• Geometry: Trail Geometry with adjustable head angle

• Extras: SWAT™ Door integration, internal cable routing, threaded bottom bracket

• Compatibility: SRAM UDH

• Rear travel: 145 mm

Suspensions

• Shock absorber: FOX FLOAT Performance with GENIE technology

  • LSR adjustment, two-position lever

  • Dimensions: S1: 210x52.5mm – S2-S6: 210x55mm

• Fork: FOX FLOAT 36 Rhythm with GRIP damper

  • 2-position sweep

  • S1: 140mm – S2-S6: 150mm

  • Offset: 44mm, axle 15x110mm

Brakes

• Front: TRP Trail EVO 4-piston, 203mm

• Rear: TRP Trail EVO 4-piston

  • S1-S2: 180mm

  • S3-S6: 203mm

Drivetrain

• Shifters: Shimano SLX M7100, 12 speed

• Rear derailleur: Shimano SLX M7100 SGS

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

• Chain: Shimano SLX M7100

• Crankset: Shimano SLX M7120, 32T

  • Lengths: S1-S3: 165mm – S4-S6: 170mm

• Bottom bracket: Shimano BB-MT801, threaded

Wheels

• Rims: Specialized alloy, hookless, 30 mm internal, tubeless ready

• Hubs: alloy with sealed cartridge bearings

  • Front: 15x110 mm – 28 holes

  • Rear: 12x148 mm – 28 holes

• Spokes: DT Swiss Industry

• Tires:

  • Front: Butcher GRID TRAIL, GRIPTON® T9, 29x2.3"

  • Rear: Eliminator GRID TRAIL, GRIPTON® T7

    • S1-S2: 27.5x2.3" – S3-S6: 29x2.3"

• Inner tubes: Standard, Presta valve

Cockpit

• Handlebar: Specialized 6000 series alloy

  • S1-S2: 780mm (20mm rise)

  • S3-S4: 800mm (30mm rise)

  • S5-S6: 800mm (40mm rise)

• Stem: Alloy Trail Stem, 35mm

• Grips: Specialized Trail Grips

• Saddle: Bridge Comp with Hollow Cr-mo rails

  • S1-S2: 155mm – S3-S6: 143mm

• Dropper post: X-Fusion Manic with remote lever

  • S1: 125mm – S2: 150mm – S3: 170mm – S4-S6: 190mm

  • Diameter: 34.9mm

Product Details

• Weight: 16.17 kg (size S4)

• Identifier: 221397

• Warranty: Lifetime supply of rear hub bearings for the original purchaser

Note Well

Technical specifications may change without notice depending on component availability.
Product images are for illustrative purposes only and may not exactly reflect the described features.

The Specialized Stumpjumper 15 Comp Alloy is not just a trail bike: it's your new secret weapon to tackle every trail with confidence, speed, and control. Get ready to redefine your concept of riding.