2025 Specialized Stumpjumper 15 Comp Alloy 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.
BREAKTHROUGH CAPABILITY: GENIE Shock Technology combines a poppy, playful ride with a bottomless DH feel.
ULTIMATE CONTROL: Measurably better traction than “Bike of the Year” Stumpjumper EVO.
UNMATCHED PERSONALIZATION: Six-way geometry adjustment, mixed wheel or 29”; tunable spring curve, and more.
GENIE—The Magic Carpet Ride: The biggest innovation on the Stumpjumper 15 Alloy is GENIE. This patent-pending air spring technology we invented grants every trail rider three wishes: the maximum grip and traction of a coil spring feel, better bottom-out prevention than a standard air spring, and the ability to tune mid-stroke and end-stroke support independently.
ILLUMINATING GENIE: 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 avoid bottom-outs. Truly, it's the best of both worlds – coil and air – with extra tunability. Say goodbye to compromises and hello to the future of riding.
WHAT BUMP?: With 16.3% better bump force management than a traditional air-sprung shock, GENIE makes the Stumpjumper 15 Alloy ride like a bike with more travel. For example, the Stumpjumper 15 Alloy (with 145 mm rear wheel travel) and our Enduro (170 mm travel) both use 101 mm of travel to absorb a 1080 N bump force.
TRACTION GALORE: Extensive field testing proves that Stumpjumper 15 Alloy with GENIE delivers 57% better traction 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: 39% fewer bottom-outs than a standard air spring. During big hit events, you benefit from the rising rate in the last 30% of the GENIE stroke. Because of this two-stage, pronounced rising rate, GENIE reduces the frequency and severity of bottom-outs.
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, any terrain. The head angle and bottom bracket height can be fine-tuned for stability or clearance.
WHEEL CHOICE: With our 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.
CARRY IT ALL: SWAT on Stumpjumper 15 Alloy 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 policies 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
- Robust Specialized alloy wheels with sealed cartridge bearings
- Ride Dynamics tuned FOX FLOAT Performance with Specialized GENIE patent-pending air spring technology provides maximum grip and traction found in a linear coil spring, bottom-out prevention found in a progressive air spring, and the ability to tune mid-stroke and end-stroke support independently. 2-position open and firm damper adjustments.
- Eat up the chunkiest trails with the FOX FLOAT 36 Rhythm fork with GRIP damper
- Performance-focused and durable Shimano SLX drivetrain
- Big stopping power from TRP Trail EVO 4-piston brakes
- Trustworthy time and time again X-Fusion Manic 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 36 Rhythm, GRIP damper, two position Sweep adjustment, 15x110mm QR axle, 44mm offset, S1:140mm of travel, S2-S6:150mm of travel |
| Rear Shock | FOX FLOAT Performance with Specialized GENIE Shock Tech, Ride Dynamics Trail Tune, 2-position lever w/ LSR adjustment, S1:210x52.5mm, S2-S6:210x55mm |
| 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, S1-S3:165mm, S4-S6: 170mm |
| Bottom Bracket | Shimano, BB-MT801, Threaded |
| Rims | Specialized, hookless alloy, 30mm inner width, tubeless ready, Front: 29, Rear: S1-S2: 27.5, S3- S6: 29 |
| Front Hub | Specialized alloy front hub disc, sealed cartridge bearings, 6-bolt, 15x110mm thru-axle, 32h |
| Rear Hub | Alloy, sealed cartridge bearings, 12x148mm thru-axle, 28h |
| Spokes | DT Swiss Industry |
| 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 |
| Front Brake | TRP Trail EVO, 4-piston caliper, hydraulic disc, 203mm |
| Rear Brake | TRP Trail EVO, 4-piston caliper, hydraulic disc, S1-S2: 180mm, S3-S6: 203mm |
| 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 Comp, Hollow Cr-mo rails, S1-S2: 155mm, S3-S6: 143mm |
| Seatpost | X-Fusion Manic, infinite adjustable, two-bolt head, bottom mount cable routing, remote SLR LE lever, 34.9, S1: 125mm, S2: 150mm, S3: 170mm, S4-S6: 190mm |
2025 Specialized Stumpjumper 15 Comp Alloy
| Bike/Frame Size | S1 | S2 | S3 | S4 | S5 | S6 |
|---|---|---|---|---|---|---|
| Stack | 608 mm | 618 mm | 627 mm | 640 mm | 654 mm | 667 mm |
| Reach | 400 mm | 425 mm | 450 mm | 475 mm | 500 mm | 530 mm |
| Chainstay Length | 430 mm | 432 mm | 435 mm | 435 mm | 445 mm | 445 mm |
| Wheelbase | 1149 mm | 1181 mm | 1213 mm | 1244 mm | 1285 mm | 1322 mm |
| Top-tube Length (horizontal) | 541 mm | 573 mm | 595 mm | 624 mm | 647 mm | 677 mm |
| Bike Standover Height | 738 mm | 751 mm | 745 mm | 745 mm | 745 mm | 751 mm |
| Seat Tube Length | 385 mm | 385 mm | 405 mm | 425 mm | 445 mm | 465 mm |
| Seat Tube Angle | 78° | 77° | 77° | 76.5° | 76.5° | 76.5° |
| Saddle Height for Effective ST Angle | 645 mm | 690 mm | 735 mm | 780 mm | 825 mm | 870 mm |
| Max Seatpost Insertion | 245 mm | 245 mm | 255 mm | 255 mm | 285 mm | 285 mm |
| Min Seatpost Insertion | 80 mm | 80 mm | 80 mm | 80 mm | 80 mm | 80 mm |
| Headtube Length | 95 mm | 100 mm | 110 mm | 125 mm | 140 mm | 155 mm |
| Headtube Angle | 64.5° | 64.5° | 64.5° | 64.5° | 64.5° | 64.5° |
| BB Height | 334 mm | 337 mm | 337 mm | 337 mm | 337 mm | 337 mm |
| BB Drop | 41 mm | 38 mm | 38 mm | 38 mm | 38 mm | 38 mm |
| Trail | 129 mm | 130 mm | 130 mm | 130 mm | 130 mm | 130 mm |
| Fork Length (full) | 551 mm | 561 mm | 561 mm | 561 mm | 561 mm | 561 mm |
| Fork Rake/Offset | 44 mm | 44 mm | 44 mm | 44 mm | 44 mm | 44 mm |
| Front Center | 720 mm | 751 mm | 780 mm | 812 mm | 843 mm | 879 mm |
Size Guide: 2025 Specialized Stumpjumper 15 Comp Alloy
