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Our Stumpjumper ST models are snappy and nimble, yet Incredibly versatile—the perfect rigs for riders seeking both efficiency and capability. The Stumpjumper ST Alloy 27.5 makes that winning combo affordable, with components that are big on performance and small on dollar signs.
THE ULTIMATE TRAIL BIKE
The innovative sidearm frame design makes a lighter, better-handling bike. By directly connecting all three mounting points of the rear-end and shock to the frame, we've increased both stiffness and performance over bumps. End result? Total control.
PERFECTLY-BALANCED SUSPENSION
Our in-house suspension-tuning team develops custom shock tunes, perfectly paired to each bike's kinematics. We call this Rx Tune and while it's not the easy way to build a suspension bike, it's worth it. You feel Rx Tune as perfectly-balanced suspension.
SMART PARTS PICK
• 27.5 wheels accentuate the Stumpjumper ST's playful on-trail feel.
• 130-millimeters of suspension courtesy of a RockShox Recon RL fork.
• SX Eagle 12-speed drivetrain gives you single-ring simplicity and gearing to spare.
Manual Downloads
Technical Specifications
FRAMESET
| FRAME | M5 alloy chassis and rear end, asymmetrical design, 27.5 Trail Geometry, threaded BB, fully enclosed internal cable routing, 12x148mm dropouts, sealed cartridge bearing pivots, replaceable derailleur hanger, 130mm of travel |
| SEAT BINDER | Specialized bolt-type, alloy, 38.6mm |
SUSPENSION
| REAR SHOCK | X-Fusion 02 Pro RL, Rx Trail Tune, rebound adjust, lockout 190x45mm |
| FORK | RockShox Recon RL, Motion Control damper with low-speed compression to lockout, 46mm offset, rebound adjust, 15x110mm Boost™ Maxle® Lite thru-axle, 130mm of travel |
COCKPIT
| STEM | Specialized, 3D-forged alloy, 4-bolt, 7-degree rise |
| HANDLEBARS | Specialized Trail, 6061 alloy, 8-degree backsweep, 6-degree upsweep, 27mm rise, 31.8mm clamp, XS 720mm, S-XL 750mm, |
| GRIPS | Specialized Sip Grip, half-waffle, slip-on |
| SADDLE | Body Geometry Myth:155 XS/S, Body Geometry Henge:143 M/L/XL, steel rails |
| SEATPOST | TransX dropper, 34.9mm, XS: 100mm, S: 125mm, ML/XL: 150mm Travel |
BRAKES
| FRONT BRAKE | Tektro Gemini Comp, hydraulic disc, resin pad, 200mm |
| REAR BRAKE | Tektro Gemini Comp, hydraulic disc, resin pad, 180mm |
DRIVETRAIN
| REAR DERAILLEUR | SRAM SX Eagle, 12-speed |
| SHIFT LEVERS | SRAM SX Eagle, trigger, 12-speed |
| CASSETTE | SRAM PG-1210 Eagle, 11-50t |
| CHAIN | SRAM SX Eagle, 12-speed |
| CRANKSET | SRAM SX Eagle, Powerspline, 170mm |
| CHAINRINGS | Steel, 32T |
| BOTTOM BRACKET | SRAM Powerspline |
WHEELS
| RIMS | Double-wall alloy, 27mm internal width |
| FRONT HUB | Specialized, sealed cartridge bearings, 15x110mm thru-axle, 32h |
| REAR HUB | Specialized, sealed cartridge bearings, 12x148mm thru-axle, 32h |
| SPOKES | Stainless, 14g |
| FRONT TIRE | Purgatory, GRID casing, GRIPTON® compound, 2Bliss Ready, 27.5 x 2.3" |
| REAR TIRE | Purgatory, GRID casing, GRIPTON® compound, 2Bliss Ready, 27.5 x 2.3" |
| INNER TUBES | Presta, 40mm valve |
* Specifications are subject to change without notice
Geometry
Stumpjumper ST - Geometry
| XS | S | M | L | XL | |
|---|---|---|---|---|---|
| Crank Length | 170 | 170 | 170 | 170 | 170 |
| Stem Length | 50 | 50 | 50 | 50 | 50 |
| Seatpost Length | 356 | 406 | 456 | 456 | 456 |
| Saddle Width | 155mm | 143mm | 143mm | 143mm | 143mm |
| Handlebar Width | 780mm | 780mm | 780mm | 780mm | 780mm |
| Reach | 405mm | 415mm | 435mm | 455mm | 480mm |
| Top Tube Length, Horizontal | 544mm | 570mm | 595mm | 627mm | 660mm |
| Stack | 581mm | 592mm | 596mm | 623mm | 637mm |
| Wheelbase | 1127mm | 1157mm | 1179mm | 1212mm | 1243mm |
| Chainstay Length | 432mm | 432mm | 432mm | 432mm | 432mm |
| Front Centre | 696mm | 726mm | 748mm | 780mm | 812mm |
| BB Drop | 28mm | 21mm | 21mm | 21mm | 21mm |
| BB Height | 325mm | 336mm | 336mm | 336mm | 336mm |
| Seat Tube Angle | 76.5° | 75.3° | 75° | 74.6° | 74.2° |
| Head Tube Angle | 66.5° | 65.5° | 65.5° | 65.5° | 65.5° |
| Seat Tube Length | 380mm | 380mm | 410mm | 455mm | 505mm |
| Head Tube Length | 100mm | 105mm | 110mm | 140mm | 155mm |
| Bike Standover Height | 742mm | 752mm | 757mm | 769mm | 770mm |
| Fork Rake/Offset | 46mm | 46mm | 46mm | 46mm | 46mm |
| Fork Length, Full | 522mm | 542mm | 542mm | 542mm | 542mm |
| Trail | 103mm | 112mm | 112mm | 112mm | 112mm |
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