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Specialized Stumpjumper 15 Alloy Mountain Bike 2025 - Trail Full Suspension MTB

The Stumpjumper 15 Alloy combines lightweight alloy construction with a robust suspension system, ensuring smooth handling over rough terrains. Its Shimano Deore drivetrain and X-Fusion rear shock deliver a responsive and customisable ride for both seasoned riders and newcomers alike.

Key Features:

Frame: M5 alloy frame, Trail Geometry, SWAT™ door integration, 145mm travel
Front Suspension: RockShox Psylo Silver fork, Motion Control Damper, 150mm travel
Rear Suspension: X-Fusion 02 Pro RL shock, 145mm travel, with adjustable rebound and lockout
Drivetrain: Shimano Deore M6100, 12-speed for smooth and precise gear changes
Brakes: Shimano MT-420 4-piston hydraulic disc brakes for reliable stopping power
Wheels: Specialized Alloy rims, tubeless ready, 29” front, 27.5” rear for smaller frame sizes
Finance: Available with 0% APR finance options

The Stumpjumper 15 Alloy is designed to give riders the perfect blend of control, efficiency, and comfort on the trails. Built with an all-new M5 alloy frame, this bike features Specialized’s SWAT™ Door integration, allowing riders to store tools and gear for quick access on the go. The RockShox Psylo Silver fork with Motion Control Damper provides 150mm of travel, soaking up the roughest trail features with ease, while the X-Fusion 02 Pro RL rear shock offers 145mm of adjustable travel to smooth out the ride.

The Shimano Deore M6100 drivetrain ensures crisp, reliable shifting across 12 speeds, letting you tackle steep climbs and fast descents with confidence. For braking, Shimano MT-420 4-piston brakes offer powerful, controlled stopping performance, giving you the confidence to push your limits. The combination of Butcher and Eliminator GRID TRAIL tyres offers excellent grip and stability, allowing you to ride with confidence on a variety of surfaces.

With personalisation options like adjustable suspension settings and a dropper post for varied terrain, the Stumpjumper 15 Alloy is perfect for riders looking to refine their setup and tackle the most challenging trails. And with 0% APR finance available, it’s easier than ever to get this trail beast on the trails.

Occasionally, without notice, manufacturers change product design and/or specifications.

Specialized Stumpjumper 15 Size Chart

Size	Height (cm)	Height (inches)
S1 (XS)	150 – 160	4’11” – 5’3”
S2 (S)	157 – 173	5’2” – 5’8”
S3 (M)	165 – 180	5’5” – 5’11”
S4 (L)	173 – 188	5’8” – 6’2”
S5 (XL)	178 – 193	5’10” – 6’4”
S6 (XXL)	188 - 203	6’2” – 6’3”

Find your S Size

Determining your S-Size is easy. If you rode a Medium before, then S-3 will be your equivalent size. But if you want a more nimble ride, you should drop down to an S2. Want a bike that’s more stable at speed? Bump up to an S4. Following are examples of three riders, all 5’8” (1.73m), who chose three different sizes.

Stumpjumper S size examples

Specialized Stumpjumper 15 Geometry

	S1 (XS)	S2 (S)	S3 (M)	S4 (L)	S5 (XL)	S6 (XXL)
Crank Length	165mm	165mm	165mm	170mm	170mm	170mm
Handlebar Width	780mm	780mm	800mm	800mm	800mm	800mm
Stem Length	35mm	35mm	35mm	35mm	35mm	35mm
Saddle Width	155mm	155mm	143mm	143mm	143mm	143mm
Seatpost Length	125mm	150mm	170mm	170mm	170mm	170mm
Stack	608mm	618mm	627mm	640mm	654mm	667mm
Reach	400mm	425mm	450mm	475mm	500mm	530mm
Headtube Length	95mm	100mm	110mm	125mm	140mm	155mm
Headtube Angle	64.5°	64.5°	64.5°	64.5°	64.5°	64.5°
BB Height	334mm	337mm	337mm	337mm	337mm	337mm
BB Drop	41mm	38mm	38mm	38mm	38mm	38mm
Trail	129mm	130mm	130mm	130mm	130mm	130mm
Fork Length (full)	551mm	561mm	561mm	561mm	561mm	561mm
Fork Rake/Offset	44mm	44mm	44mm	44mm	44mm	44mm
Front Centre	720mm	751mm	780mm	812mm	843mm	879mm
Chainstay Length	430mm	432mm	435mm	435mm	445mm	445mm
Wheelbase	1149mm	1181mm	1213mm	1244mm	1285mm	1322mm
Top-tube Length (horizontal)	541mm	573mm	595mm	624mm	647mm	677mm
Bike Standover Height	738mm	751mm	745mm	745mm	745mm	751mm
Seat Tube Length	385mm	385mm	405mm	425mm	445mm	465mm
Seat Tube Angle	78°	77°	77°	76.5°	76.5°	76.5°
Saddle Height for Effective ST Angle	645mm	690mm	735mm	780mm	825mm	870mm
Max Seatpost Insertion	245mm	245mm	255mm	255mm	285mm	285mm
Min Seatpost Insertion	80mm	80mm	80mm	80mm	80mm	80mm

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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	RockShox, Psylo Silver, Motion Control Damper, 15x110 axle, 44mm offset, S1:140mm of travel, S2-S6:150mm of travel
Rear Shock	X-Fusion 02 Pro RL, Ride Dynamics Trail Tune, rebound adjust, lockout S1:210x52.5mm, S2-S6:210x55mm
Stem	Alloy Trail Stem, 35mm bar bore
Bars	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
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 Mech	Shimano Deore, M6100, 12pd, Shadow Plus
Shifters	Shimano Deore, M6100, 12spd
Speed	12
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 Tyre	Butcher, GRID TRAIL casing, GRIPTON® T9 compound, 2Bliss Ready, 29x2.3"
Rear Tyre	Eliminator, GRID TRAIL casing, GRIPTON® T7 compound, 2Bliss Ready, S1-S2: 27.5x2.3, S3- S6: 29x2.3"
Seat Post	TranzX Dropper, remote SLR LE lever, 34.9, S1: 125mm, S2: 150mm, S3: 170mm, S4-S6: 200mm
Saddle	Bridge, Steel rails, S1-S2: 155mm, S3-S6: 143mm
Chainset	Shimano Deore, M6120, 30T ring, 55mm chainline, S1-S3:165mm, S4-S6: 170mm
Chain	Shimano Deore, M6100, 12-speed
Cassette	Shimano Deore M6100, 12spd w/Hyperglide+, 10-51t
Pedals	Resin Platform
Weight	16.57 kg