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Men's Stumpjumper ST Alloy 27.5
2018 Men's Stumpjumper ST Alloy 27.5
All of you die-hard alloy fans can rejoice. Yes, the new Stumpjumper ST comes in an alloy version, and it may be the most radically designed alloy bike ever made. And with new tube shapes, an asymmetrical design, and the snappy handling that the 27.5 platform is known for, the Stumpjumper ST Alloy 27.5 is sure to exceed your expectations of how a trail bike should ride.
Our design goal for the new Stumpjumper was simple—build the ultimate trail bike, one that feels telepathic. And it turns out that this feeling all comes down to stiffness. Think of it this way: when the frame's telling your hands one thing and your feet another, your brain gets confused with the imbalance and the bike feels unstable. In order to fix this, we had to get to work on dialing-in the materials and shapes.
We continued down the suspension path with a custom Rx Trail Tune on both the fork and rear shock. Suspension performance is highly dependent on frame, wheel, and rider size, so we use our Rx Tune to get each bike to land in the middle of the adjustment spectrum, and this gives you the biggest possible range to fine-tune your ride. Another focal point of the tune was matching the suspension characteristics between wheel sizes—we developed a specific Rx Tune for each platform. So, no matter what wheel size you prefer, you'll get perfectly linear suspension.
Steps were also taken to make this bike easy to live with. Threaded bottom brackets make a triumphant return, and we made room for up to a 2.8" tire. You're also free to run whatever aftermarket rear shock you want, since we're using standard metric shocks. And customization is furthered with a Flip Chip that lets you to dial-in your Stumpy to your riding style. Switch it from High to Low and it drops your bottom bracket 6mm and slackens the head tube by half-a-degree. Little details also jump out to surprise you, like a newly designed ribbed chainstay protector that makes chain slap a thing of the past and nearly silences the drivetrain.
The build here is no-nonsense with a focus on dependable, high-performing parts, like Shimano SLX front and rear derailleurs, Tektro Gemini disc brakes, a RockShox Recon RL fork with 130mm of travel, a custom X-Fusion 02 Pro RL rear shock with 130mm of travel, and wide alloy wheels.
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 190x42.5mm
FORK
RockShox Recon RL, Solo Air, 42mm offset, rebound adjust, lockout, 15x110mm Boost™ Maxle® Lite thru-axle, 130mm of travel
COCKPIT
STEM
Specialized, 3D-forged alloy, 4-bolt, 7-degree rise
HANDLEBARS
Specialized, 6061 alloy, 6-degree upsweep, 8-degree backsweep, 27mm rise, 780mm width
GRIPS
Specialized Sip Grip, half-waffle, slip-on
SADDLE
Body Geometry Henge Sport, steel rails, 143mm
SEATPOST
Alloy, two-bolt clamp, 34.9mm
BRAKES
FRONT BRAKE
Tektro Gemini Comp, hydraulic disc, resin pad, 200mm rotor
REAR BRAKE
Tektro Gemini Comp, hydraulic disc, resin pad, 180mm rotor
DRIVETRAIN
REAR DERAILLEUR
Shimano SLX, Shadow Plus, 11-speed
SHIFT LEVERS
Shimano SLX, 11-speed
CASSETTE
SunRace, 11-speed, 11-46t
CHAIN
KMC X11, 11-speed w/ Missing Link™
CHAINRINGS
32T
CRANKSET
SRAM NX, Boost™, direct-mount XSYNC, Powerspline
BOTTOM BRACKET
SRAM Power Spline
WHEELS
RIMS
700C disc, double-wall alloy, pinned
FRONT HUB
Specialized, sealed cartridge bearings, 15x110mm spacing, 32h
REAR HUB
Specialized, sealed cartridge bearings, 12x148mm thru-axle, 32h
SPOKES
Stainless, 14g
FRONT TIRE
Butcher, 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
ACCESSORIES
PEDALS
Specialized Dirt
* Weights based on production painted frames as pictured. Actual weights will vary based on colorway, frame size, and component variation. Specifications are subject to change without notice.
Geometry
| S | M | L | XL | |
|---|---|---|---|---|
| Crank Length | 170MM | 170MM | 170MM | 170MM |
| Handlebar Width | 780mm | 780mm | 780mm | 780mm |
| Stem Length | 50mm | 50mm | 50mm | 50mm |
| Saddle Width | 143mm | 143mm | 143mm | 143mm |
| Seatpost Length | 375mm | 375mm | 435mm | 435mm |
| Stack | 586mm | 590mm | 618mm | 631mm |
| Reach | 425mm | 444mm | 465mm | 490mm |
| Head Tube Length | 105mm | 110mm | 140mm | 155mm |
| Head Tube Angle | 66.5° | 66.5° | 66.5° | 66.5° |
| BB Height | 325mm | 325mm | 325mm | 325mm |
| BB Drop | 28mm | 28mm | 28mm | 28mm |
| Trail | 103mm | 103mm | 103mm | 103mm |
| Fork Length, Full | 522mm | 522mm | 522mm | 522mm |
| Fork Rake/Offset | 46mm | 46mm | 46mm | 46mm |
| Front Center | 718mm | 739mm | 772mm | 803mm |
| Chainstay Length | 432mm | 432mm | 432mm | 432mm |
| Wheelbase | 1149mm | 1170mm | 1203mm | 1234mm |
| Top Tube Length, Horizontal | 568mm | 591mm | 624mm | 657mm |
| Bike Standover Height | 744mm | 749mm | 761mm | 762mm |
| Seat Tube Length | 380mm | 410mm | 455mm | 505mm |
| Seat Tube Angle | 76.3° | 76° | 75.6° | 75.2° |
Rider Reviews
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