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Stumpjumper 15 Alloy

5

1 Reviews

Stumpjumper 15 Alloy is here to obliterate every trade-off in the trail game. Devour…

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GENIE Grants Every Trail Rider’s Wishes

GENIE Grants Every Trail Rider’s Wishes

This game-changing, patent-pending air spring technology that we invented grants every trail rider three wishes: feel and control of a coil spring, better bottom-out prevention than a standard air spring, and a tunable “platform” for a playful feel.

What’s Inside GENIE

What’s Inside GENIE

Check out how GENIE combines the control-enhancing linear spring rate of a coil spring through the “bump zone” with the progressive spring rate of an air spring at the end of the stroke to reduce bottom-outs. It's the best of both worlds – coil and air – with extra tuneability. Say goodbye to compromises and hello to the future of riding.

Unlock Your Ride with Tunable Geo

Unlock Your Ride with Tunable Geo

Stumpjumper 15 boasts the planet's most capable trail geometry. With six-way adjustability, tailor your ride to perfectly match your style and terrain. Explore our interactive Geo Finder to pinpoint your ideal setting.

Eats Bumps Like an Enduro

Eats Bumps Like an Enduro

GENIE shock technology gives the Stumpy 15 16.3% better bump performance than ‘Bike of the Year’ Stumpjumper EVO. It literally uses more travel for the same size bump, thanks to its flatter spring curve in the first 70% of travel.

57% Better Traction

57% Better Traction

GENIE delivers 57% less traction loss time than a standard air-sprung shock because GENIE technology gives you supple, coil-like performance, which keeps the wheel in contact with the ground a greater percent of the time than a typical air spring would.

Bye, Bye, Bottom Outs

Bye, Bye, Bottom Outs

Send it with confidence knowing that in field testing GENIE eliminated 39% of severe bottom out events compared to a standard FOX Float air spring.

Meet the Creators

Meet the Creators

Many (dirty) hands, one (awesome) bike. Over 50 R&D teammates, each and every one a trail rider, worked for more than three years to make Stumpjumper 15 One Bike to Rule All Trails.

All You Need to Know

All You Need to Know

Don’t like to read? No problem. Check out this short video and learn of all the highlights about the Stumpjumper 15.

Stumpjumper 15 - All You Need to Know

Product Details

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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

Technical Specifications

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Frameset

SWAT

SWAT internal downtube storage

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

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

Brakes

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

Drivetrain

Shift Levers

Shimano Deore, M6100, 12spd

Rear Derailleur

Shimano Deore, M6100, 12pd, Shadow Plus

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

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, 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

Product Details

Product ID

276239

Weight

Weight

16.57 kg (36 lb, 8.5 oz)

Weight Size

S4

* Weights based on production painted frames as pictured. Actual weights will vary based on colorway, frame size, and component variation. Specifications are subject to change without notice.

Geometry

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S1S2S3S4S5S6
Crank Length165mm165mm165mm170mm170mm170mm
Handlebar Width780mm780mm800mm800mm800mm800mm
Stem Length40mm40mm40mm40mm40mm40mm
Saddle Width155mm155mm143mm143mm143mm143mm
Seatpost Length125mm150mm170mm200mm200mm200mm
Stack608mm618mm627mm640mm654mm667mm
Reach400mm425mm450mm475mm500mm530mm
Headtube Length95mm100mm110mm125mm140mm155mm
Headtube Angle64.5°64.5°64.5°64.5°64.5°64.5°
BB Height334mm337mm337mm337mm337mm337mm
BB Drop41mm38mm38mm38mm38mm38mm
Trail129mm130mm130mm130mm130mm130mm
Fork Length (full)551mm561mm561mm561mm561mm561mm
Fork Rake/Offset44mm44mm44mm44mm44mm44mm
Front Center720mm751mm780mm812mm843mm879mm
Chainstay Length430mm432mm435mm435mm445mm445mm
Wheelbase1149mm1181mm1213mm1244mm1285mm1322mm
Top-tube Length (horizontal)541mm573mm595mm624mm647mm677mm
Bike Standover Height738mm751mm745mm745mm745mm751mm
Seat Tube Length385mm385mm405mm425mm445mm465mm
Seat Tube Angle78°77°77°76.5°76.5°76.5°
Saddle Height for Effective ST Angle645mm690mm735mm780mm825mm870mm
Max Seatpost Insertion245mm245mm255mm255mm285mm285mm
Min Seatpost Insertion80mm80mm80mm80mm80mm80mm
Geometry

Rider Reviews

5

1 Reviews

 

2025 Al Stumpy

It really is a tuneable bike. Light, plush,and smooth. Swat storage is great, Deore drive train is ok, brakes are smooth. Dropper feels great. I've even enjoyed the stock rubber so far.


Name:
Jeffrey

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