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Men's Stumpjumper ST Comp Carbon 29

2018 Men's Stumpjumper ST Comp Carbon 29

With the same 11m carbon construction as the S-Works, the Stumpjumper ST Comp Carbon 29 brings you transcendent handling, custom-tuned suspension, and an elimination of proprietary headaches—all while keeping the speed you look for with 29-inch wheels. And don't forget that with its "ST" distinction, this Stumpjumper gets slightly steeper angles and less suspension (130mm front/120mm rear), so you get more nimble and responsive climbing ability and sublime descending prowess.

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, shapes, and the layout.

We started by creating our own mountain-specific stiffness test, and then we looked at the layout with Finite Element Analysis (FEA) to see where we could get the biggest stiffness improvements. This led to a big discovery: The Large and X-Large frames needed more front-end stiffness while the Smalls and Mediums were just fine. We were able to create a frame design that was 20% more efficient. And in the end, this proved to be one of the lightest trail frames on the market, today.

When designing the frame with the stiffness targets being a main goal, we developed a radical new sidearm design. The front-end and rear-end are connected at three points, and the sidearm helps keep all these points super stiff and connected, all while taking about 100 grams out of the rear-end. More explicitly, this minimizes frame flex when the rear suspension is active.

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 2.6" tire. You're also free to run whatever aftermarket rear shock you want, since we're using standard metric shocks. We revamped the SWAT™ box, too, making it sleeker, lighter, and with more volume. 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. Lastly, we seriously couldn't make cable routing any easier on carbon models. Full tubes can be found throughout the carbon frame, so all you have to do is push the cable and it'll come out the other end. No more lazy loop, hidden stashes of magnets, pokey spokes, or pillows to cry in.

The build on this Comp model comes with a list of components that deliver undeniable quality, like a Shimano XT/SLX drivetrain with RaceFace cranks, Shimano SLX disc brakes, a FOX FLOAT Rhythm 34 for with 130mm of travel, a FOX FLOAT DPS rear shock with 120mm of travel, and Roval Traverse 29 wheels.

Technical Specifications

FRAMESET

FRAME

FACT 11m, full carbon chassis and rear end, asymmetrical design, 29 Trail Geometry, SWAT™ Door integration, threaded BB, fully enclosed internal cable routing, 12x148mm dropouts, sealed cartridge bearing pivots, replaceable derailleur hanger, 120mm of travel

SEAT BINDER

Specialized bolt-type, alloy, 38.6mm

SUSPENSION

REAR SHOCK

FOX FLOAT DPS Performance, Rx Trail Tune, rebound and 3-position compression adjust, 190x42.5MM

FORK

FOX FLOAT Rhythm 34, GRIP Damper, 51mm offset, 2-position sweep adjust, 15x110mm, tapered alloy steerer, 130mm of travel

COCKPIT

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

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

DRIVETRAIN

REAR DERAILLEUR

Shimano XT, Shadow Plus, GS cage, 11-speed

SHIFT LEVERS

Shimano SLX, 11-speed

CHAINRINGS

30T

CASSETTE

Shimano SLX, 11-speed, 11-46t

CRANKSET

RaceFace Aeffect, 24mm spindle, 170mm crankarm

CHAIN

KMC X11, 11-speed w/ Missing Link™

BOTTOM BRACKET

Threaded BB, 24mm spindle

BRAKES

FRONT BRAKE

Shimano SLX, hydraulic disc, resin pads, 200mm

REAR BRAKE

Shimano SLX, hydraulic disc, resin pads, 180mm

WHEELS

REAR HUB

Specialized, sealed cartridge bearings, 12x148mm thru-axle, 28h

FRONT HUB

Specialized, sealed cartridge bearings, 15x110mm spacing, 28h

RIMS

Roval Traverse 29, hookless alloy, 29mm inner width, tubeless ready, 28h

INNER TUBES

Standard, Presta valve

FRONT TIRE

Butcher, GRID Casing, GRIPTON® compound, 2Bliss Ready, 29x2.3"

REAR TIRE

Purgatory, GRID casing, GRIPTON® compound, 2Bliss Ready, 29x2.3"

SPOKES

DT Swiss Industry

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

SMLXL
Crank Length170mm170mm170mm170mm
Handlebar Width780mm780mm780mm780mm
Stem Length45MM45MM45MM45MM
Saddle Width143mm143mm143mm143mm
Seatpost Length376mm438mm438mm438mm
Stack607mm607mm635mm649mm
Reach415mm435mm455mm480mm
Head Tube Length95mm95mm125mm140mm
Head Tube Angle67.5°67.5°67.5°67.5°
BB Height333mm333mm333mm333mm
BB Drop39mm39mm39mm39mm
Trail99mm99mm99mm99mm
Fork Length, Full540mm540mm540mm540mm
Fork Rake/Offset51mm51mm51mm51mm
Front Center707mm727mm758mm789mm
Chainstay Length437mm437mm437mm437mm
Wheelbase1141mm1161mm1192mm1223mm
Top Tube Length, Horizontal569mm592mm624mm657mm
Bike Standover Height740mm743mm755mm768mm
Seat Tube Length380mm410mm455mm505mm
Seat Tube Angle75.8°75.5°75.1°74.7°
Geometry

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