2025 Specialized Stumpjumper 15 Alloy Fox Edition Features
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.
At a Glance
- All-new M5 alloy frame with SWAT door integration
- Roval Traverse alloy wheels with DT Swiss hubs
- Ride Dynamics Tuned FOX DHX Factory coil shock
- Beefy FOX FLOAT 38 Factory fork with GRIP X2 damper
- Performance-focused and durable Shimano SLX drivetrain
- Big stopping power from TRP DH-R EVO 4-piston brakes
- Adjustable travel PNW LOAM dropper post
- Lifetime replacement of suspension pivot bearings to the original owner
Component Specifications
| 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 |
| Fork | FOX FLOAT 38 Factory, GRIP X2 damper, HS and LS rebound and compression adjustment, 15x110mm QR axle, 44mm offset, 160mm of travel |
| Rear Shock | FOX DHX Factory, Ride Dynamics Trail Tune, 210x55mm, S2: 400lbs, S3: 450lbs, S4: 500bs, S5: 550lbs, S6: 600lbs |
| Shift Levers | Shimano SLX, M7100, 12spd |
| Rear Derailleur | Shimano SLX, M7100, SGS, 12-speed |
| Cassette | Shimano SLX, CS-M7100, 12-speed, 10-51t |
| Chain | Shimano SLX, M7100, 12-speed |
| Crankset | Shimano SLX, M7120, 32T ring, 55mm chainline, S2-S3:165mm, S4-S6: 170mm |
| Bottom Bracket | Shimano, BB-MT801, Threaded |
| Rims | Roval Traverse, hookless alloy, 30mm inner width, tubeless ready, Front: 29, Rear: 27.5 |
| Front Hub | DT Swiss 370, 15x110mm, 28h |
| Rear Hub | DT Swiss 370, 12x148mm, 32h |
| Spokes | Sapim Force |
| Front Tire | Butcher, GRID TRAIL casing, GRIPTON® T9 compound, 2Bliss Ready, 29x2.3" |
| Rear Tire | Eliminator, GRID GRAVITY casing, GRIPTON® T9/T7 compound, 2Bliss Ready, 27.5x2.3" |
| Inner Tubes | Standard, Presta valve |
| Front Brake | TRP DH-R EVO, 4-piston caliper, hydraulic disc, 220mm |
| Rear Brake | TRP DH-R EVO, 4-piston caliper, hydraulic disc, 203mm |
| Stem | Deity, 35mm clamp, 35mm length |
| Handlebars | Deity, Racepoint, 5-degree upsweep, 9-degree backsweep, 810 width, S2: 25mm rise: S3-S6: 38mm rise |
| Grips | Deity, Knuckleduster, Black |
| Saddle | Bridge Comp, Hollow Cr-mo rails, S1-S2: 155mm, S3-S6: 143mm |
| Seatpost | PNW Loam OE Dropper, tool-less travel adjust, Range lever, 34.9, S2: 150mm, S3: 170mm, S4-S6: 200mm |
2025 Specialized Stumpjumper 15 Alloy Fox Edition
| Bike/Frame Size | S2 | S3 | S4 | S5 | S6 |
|---|---|---|---|---|---|
| Stack | 621 mm | 630 mm | 644 mm | 657 mm | 671 mm |
| Reach | 420 mm | 445 mm | 470 mm | 495 mm | 525 mm |
| Chainstay Length | 432 mm | 432 mm | 432 mm | 442 mm | 442 mm |
| Wheelbase | 1186 mm | 1216 mm | 1247 mm | 1288 mm | 1325 mm |
| Top-tube Length (horizontal) | 574 mm | 596 mm | 625 mm | 649 mm | 678 mm |
| Bike Standover Height | 751 mm | 745 mm | 745 mm | 745 mm | 751 mm |
| Seat Tube Length | 385 mm | 405 mm | 425 mm | 445 mm | 465 mm |
| Seat Tube Angle | 76.5° | 76.5° | 76° | 76° | 76° |
| Saddle Height for Effective ST Angle | 690 mm | 735 mm | 780 mm | 825 mm | 870 mm |
| Max Seatpost Insertion | 245 mm | 255 mm | 255 mm | 285 mm | 285 mm |
| Min Seatpost Insertion | 80 mm | 80 mm | 80 mm | 80 mm | 80 mm |
| Headtube Length | 100 mm | 110 mm | 125 mm | 140 mm | 155 mm |
| Headtube Angle | 64° | 64° | 64° | 64° | 64° |
| BB Height | 340 mm | 340 mm | 340 mm | 340 mm | 340 mm |
| BB Drop | 35 mm | 35 mm | 35 mm | 35 mm | 35 mm |
| Trail | 134 mm | 134 mm | 134 mm | 134 mm | 134 mm |
| Fork Length (full) | 573 mm | 573 mm | 573 mm | 573 mm | 573 mm |
| Fork Rake/Offset | 44 mm | 44 mm | 44 mm | 44 mm | 44 mm |
| Front Center | 755 mm | 785 mm | 816 mm | 848 mm | 884 mm |
Size Guide: 2025 Specialized Stumpjumper 15 Alloy Fox Edition
