Specialized Stumpjumper 15 Alloy Complete Mountain Bike 2025
Model Info
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Product Info
The Specialized Stumpjumper 15 Alloy Complete Mountain Bike is a budget friendly trail-taming machine that blends a robust M5 alloy frame with 145mm of rear travel and a 150mm RockShox Psylo Silver fork, delivering a ride that's both responsive and composed. Equipped with mixed wheels, adjustable geometry, and SWAT™ internal storage, it's built to ride everything from technical climbs to rowdy descents with confidence and style.
Product Details
Key Features
M5 Alloy Chassis – 100% Redesigned durable alloy chassis.
Wheel Size – Mixed Wheel (29" Front / 27.5" Rear)
Travel – Travel - 150mm Front / 145mm Rear
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.
Adjustable Geometry – The Stumpjumper 15 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, any terrain. Head angle and bottom bracket height can be fine-tuned for stability or clearance.
Wheel Choice – With aftermarket 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.
SWAT 4.0 – SWAT 4.0 on Stumpjumper 15 elevates downtube storage, an innovation Specialized pioneered. It’s the smoothest operating, most weather-resistant, flush-mounted system ever.
Specs
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Biking Type:
Mountain
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Biking Type
Mountain Mountain bikes are built for tackling rough terrain with frames made of durable materials like aluminum or carbon fiber, ensuring stability and maneuverability. They feature suspension to absorb impacts from rocks, roots, and drops, providing a smoother ride.
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Used For:
Trail
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Used For
Trail Trail bikes are the quintessential “mountain bikes.” If you’re heading into the woods expecting to do it all on two wheels – climbing, technical sections, AND fun descents – you’re looking for a trail bike.
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Suspension:
Full Suspension
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Suspension
Full Suspension Engineered to tackle the most challenging terrain with enhanced comfort and control. Unlike hardtail bikes, full suspension bikes feature both front and rear suspension systems that allow the wheels to move independently from the frame.
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Frame Material:
Aluminum Alloy
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Frame Material
Aluminum Alloy Aluminum is the second lightest material per cubic inch, after carbon, but it is significantly more affordable. It offers versatility, strength, and durability that works well in all trail disciplines.
- Gearing: 1 x 12
- Water Bottle Mounts: 1
- Fork: RockShox Psylo Silver
- Stanchion Diameter (mm): 36
- Fork Travel (mm): 150
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Rear Shock:
X-Fusion 02 Pro R
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Rear Shock
X-Fusion 02 Pro R The 02 series line of shocks see a host of changes, including a new air canister design which adds 15% more air for smoother ramp up, increased tuning options with three different size air-can volume spacers, and larger, more ergonomic knobs to allow for easier access to the adjustments. - Rear Travel (mm): 145
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Shifters:
Shimano Deore SL-M6100
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Shifters
Shimano Deore SL-M6100 With quick lever access and a light, responsive lever action, Shimano's Rapidfire Plus Deore shift lever delivers smooth control out on the trail. -
Rear Derailleur:
Shimano Deore M6100, 12-Speed
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Rear Derailleur
Shimano Deore M6100, 12-Speed The Shimano Deore M6100 rear derailleurs deliver advanced shifting performance with decreased tension in the low gear position. Larger 13T pulleys increase efficiency and chain management while compatibility with Shimano's 12-speed cassettes boosts range. -
Crankset:
Shimano Deore M6100
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Crankset
Shimano Deore M6100 The Shimano Deore FC-M6100-1 crank features an entirely new construction, using direct mount chainrings, special gear tooth profile for improved chain retention. -
Cassette:
Shimano Deore M6100, 10-51t
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Cassette
Shimano Deore M6100, 10-51t With its Beam Spider construction, the Shimano Deore M6100 12-speed cassette shaves weight while increasing Shimano's MTB gearing range another gear. Using Shimano's new Micro Spline freehub body and HYPERGLIDE+ tooth profile, the 10-51T cassette delivers advanced shifting performance. -
Chain:
Shimano Deore M6100, 12-Speed
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Chain
Shimano Deore M6100, 12-Speed The M6100 chain provides smooth shifting and enhanced chain retention thanks to an extended portion of the inner plate. The chain features Quick-Link assembly and is optimized for HYPERGLIDE+ cassettes and Dynamic Chain Engagement+ chainrings. - Pedals: Not Included
- Brake Levers: Shimano
- Brake Calipers: Shimano
- Rotors: Shimano, BR-MT420, 4-piston caliper, hydraulic disc
- Stem: Alloy Trail Stem, 35mm bar bore
- Saddle: Bridge, Steel rails, S1-S2: 155mm, S3-S6: 143mm
- Seatpost: TranzX Dropper Post
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Wheelset:
Specialized Alloy, 30mm
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Wheelset
Specialized Alloy, 30mm At 30mm wide, these hookless alloy wheels are the perfect width for aggressive trail riding. They have sealed cartridge hubs with 32 spokes front and rear, built for light weight and very high strength. - Hubs: Alloy, sealed cartridge bearings | Front: 15x110mm thru-axle / Rear: 12x148mm thru-axle
- Rims: Specialized Alloy, Tubeless Ready, 29mm internal width, 28h, Front: 29, Rear: S1-S2: 27.5, S3- S6: 29
- Spokes: Stainless, 14g
- Tires: Specialized
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Front Tire:
Specialized Butcher 2.3" | Grid Trail, Gripton® T9, 2Bliss Ready
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Front Tire
Specialized Butcher 2.3" | Grid Trail, Gripton® T9, 2Bliss Ready The Butcher GRID TRAIL 2Bliss Ready T9 features a World-Cup proven aggressive tread design to bite and grip in any condition. Ramped and siped, the center tread blocks provide maximum traction and accurate steering. The sawtooth faced shoulder knobs offer a continuous biting edge for railing through corners.- GRID TRAIL casing is a step up from GRID with more reinforcement, delivering better handling at lower pressures—all while increasing pinch flat protection by 15% and puncture protection by 30%.
- High-dampening GRIPTON® T9 compound rebounds slowly to grip and stick to the ground for total traction and control.
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Rear Tire:
Specialized Eliminator 2.3" | Grid Trail, Gripton® T7, 2Bliss Ready
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Rear Tire
Specialized Eliminator 2.3" | Grid Trail, Gripton® T7, 2Bliss Ready The Eliminator tire features a tread that combines an aggressive block design with a well-balanced tread pattern. Its transition knobs help bridge the traditional channel between center and shoulder knobs, making the Eliminator extremely predictable on soft to hardpack trails. It’s perfect for enduro and E-bikes where versatility and confidence are key.- GRID TRAIL casing is a step up from GRID with more reinforcement, delivering better handling at lower pressures—all while increasing pinch flat protection by 15% and puncture protection by 30%.
- T7 GRIPTON® compound enhances rolling speed while still providing tons of grip.
- Warranty: Limited Lifetime
| Size | S1 | S2 | S3 | S4 | S5 | S6 |
| Rider Height | 4'11" - 5'3" | 5'2" - 5'8" | 5''5" - 5'11" | 5'8" - 6'2" | 5'10" - 6'4" | 6'2" - 6'8" |
| Reach (mm) | 400 | 425 | 450 | 475 | 500 | 530 |
| Stack (mm) | 608 | 618 | 627 | 640 | 644 | 667 |
| Effective Top Tube (mm) | 541 | 573 | 595 | 624 | 647 | 677 |
| Seat Tube (mm) | 385 | 385 | 405 | 425 | 445 | 465 |
| Head Tube Angle (°) | 64.5 | 64.5 | 64.5 | 64.5 | 64.5 | 64.5 |
| Seat Tube Angle (°) | 77 | 76.5 | 77.2 | 76.9 | 77.3 | 77.6 |
| Chainstay Length (mm) | 430 | 432 | 435 | 435 | 445 | 445 |
| Bottom Bracket Height (mm) | 334 | 337 | 337 | 337 | 337 | 337 |
| Bottom Bracket Drop (mm) | 41 | 38 | 38 | 38 | 38 | 38 |
| Head Tube Length (mm) | 95 | 100 | 110 | 125 | 140 | 155 |
| Wheelbase (mm) | 1149 | 1181 | 1213 | 1244 | 1285 | 1322 |
| Standover Height (mm) | 738 | 751 | 745 | 745 | 745 | 751 |
| Wheel Size | Mixed Wheel | Mixed Wheel | Mixed Wheel | Mixed Wheel | Mixed Wheel | Mixed Wheel |