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Men's Stumpjumper Comp Alloy 27.5
2018 Men's Stumpjumper Comp Alloy 27.5
No need to fret—we haven't forgotten about all you alloy fans out there. In fact, the new Stumpjumper Comp Alloy 27.5 may be the most radically designed alloy bike ever made. For real, though. And with new tube shapes, an asymmetrical design, and the nimble 27.5 handling that we all love, it's plenty capable and ready to take on the trail.
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 a Shimano SLX drivetrain with RaceFace cranks, Shimano SLX disc brakes, FOX front and rear suspension, and Roval Traverse 27.5 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, 150mm of travel
SEAT BINDER
Specialized bolt-type, alloy, 38.6mm
COCKPIT
HANDLEBARS
Specialized, 6061 alloy, 6-degree upsweep, 8-degree backsweep, 27mm rise, 780mm width
STEM
Specialized Trail, 3D-forged alloy, 4-bolt, 6-degree rise
SEATPOST
X-Fusion Manic, infinite adjustable, two-bolt head, bottom mount cable routing, remote SRL LE lever, 34.9mm, S: 125mm, M/L/XL: 150mm of travel
SADDLE
Body Geometry Phenom Comp, Adaptive Edge design, hollow Cr-Mo rails, 143mm
GRIPS
Specialized Sip grip, half-waffle, S/M: regular thickness, L/XL: XL thickness
SUSPENSION
REAR SHOCK
FOX FLOAT DPS Performance, Rx Trail Tune, rebound and 3-position compression adjust, 210x52.5mm
FORK
FOX FLOAT Rhythm 34 27.5, 44mm offset, 2-position, tapered alloy steerer, 15x110mm Boost™, 150mm of travel
BRAKES
FRONT BRAKE
Shimano SLX, hydraulic disc, resin pads, 200mm
REAR BRAKE
Shimano SLX, hydraulic disc, resin pads, 180mm
DRIVETRAIN
SHIFT LEVERS
Shimano SLX, 11-speed
CASSETTE
Shimano SLX, 11-speed, 11-46t
REAR DERAILLEUR
Shimano XT, Shadow Plus, GS cage, 11-speed
BOTTOM BRACKET
Threaded BB, 24mm spindle
CHAINRINGS
32T
CHAIN
KMC X11, 11-speed w/ Missing Link™
CRANKSET
RaceFace Aeffect, 24mm spindle, 170mm crankarm
WHEELS
REAR HUB
Specialized, sealed cartridge bearings, 12x148mm thru-axle, 28h
SPOKES
DT Swiss Industry
FRONT HUB
Specialized, sealed cartridge bearings, 15x110mm spacing, 28h
RIMS
Roval Traverse 27.5, hookless alloy, 29mm inner width, tubeless ready, 28h
INNER TUBES
Presta, 40mm valve
FRONT TIRE
Butcher, GRID casing, GRIPTON® compound, 2Bliss Ready, 27.5 x 2.6"
REAR TIRE
Purgatory, GRID casing, GRIPTON® compound, 2Bliss Ready, 27.5 x 2.6"
ACCESSORIES
PEDALS
Specialized Dirt
* Weights based on production painted frames as pictured. Actual weights will vary based on colourway, 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 | 45MM | 45MM | 45MM | 45MM |
| Saddle Width | 143mm | 143mm | 143mm | 143mm |
| Seatpost Length | 376mm | 438mm | 438mm | 438mm |
| Stack | 592mm | 596mm | 623mm | 637mm |
| Reach | 415mm | 435mm | 455mm | 480mm |
| Head Tube Length | 105mm | 110mm | 140mm | 155mm |
| Head Tube Angle | 65.5° | 65.5° | 65.5° | 65.5° |
| BB Height | 336mm | 336mm | 336mm | 336mm |
| BB Drop | 21mm | 21mm | 21mm | 21mm |
| Trail | 112mm | 112mm | 112mm | 112mm |
| Fork Length, Full | 542mm | 542mm | 542mm | 542mm |
| Fork Rake/Offset | 46mm | 46mm | 46mm | 46mm |
| Front Center | 726mm | 748mm | 780mm | 812mm |
| Chainstay Length | 432mm | 432mm | 432mm | 432mm |
| Wheelbase | 1157mm | 1179mm | 1212mm | 1243mm |
| Top Tube Length, Horizontal | 570mm | 595mm | 627mm | 660mm |
| Bike Standover Height | 752mm | 757mm | 769mm | 770mm |
| Seat Tube Length | 380mm | 410mm | 455mm | 505mm |
| Seat Tube Angle | 75.3° | 75° | 74.6° | 74.2° |
Rider Reviews
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