With the same 11m carbon construction as the S-Works, the Specialized Stumpjumper ST Comp Carbon 29 with 12-speed SRAM NX Eagle 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.
Specialized's 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. To fix this, they had to get to work on dialling-in the materials, shapes, and layout.
Specialized started by creating their mountain-specific stiffness test, and then they looked at the layout with Finite Element Analysis (FEA) to see where they could get the biggest stiffness improvements. This led to a big discovery: The Large and XL frames needed more front-end stiffness while the Smalls and Mediums were just fine. In the end, they 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, Specialized set out to develop 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.
Continuing 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 they've used their 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—they even developed a specific RX Tune for each platform. So, no matter what wheel size you prefer, you'll get a perfectly linear suspension.
Steps were also taken to make this bike easy to live with. Threaded bottom brackets make a triumphant return, and Specialized has made room for up to a 3.0-inch tyre. You're also free to run whatever aftermarket rear shock you want since they are now using standard metric shocks. The bike features a 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, they 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 12-speed SRAM NX Eagle drivetrain, SRAM Guide R 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.
- The Stumpjumper ST's asymmetrical, FACT 11m carbon fibre construction is lightweight, stiff and ready for technical climbs and rowdy descents
- The frame is built off Specialized's 29 Trail Geometry, so it's both capable and comfortable
- SWAT™ integration in the down tube, a threaded BB, easy cable routing, and a brand new chain silencer, it's ready for anything the trail, or you, throw at it
- The FOX DPS Performance rear shock features their RX Trail Tune, ensuring that no matter the frame or wheel size, your bike is dialled-in perfectly
- SRAM's 12-speed NX Eagle groupset features a wide gear range that delivers climbing and descending efficiency in spades
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
FOX FLOAT Rhythm 34, GRIP Damper, 51mm offset, 2-position sweep adjust, 15x110mm, tapered alloy steerer, 130mm of travel
FOX FLOAT DPS Performance, Rx Trail Tune, rebound and 3-position compression adjust, 190x42.5mm
Roval Traverse 29, hookless alloy, 30mm inner width, tubeless-ready
Front: Specialized, sealed cartridge bearings, 15x110mm spacing, 28h
Rear: Specialized, sealed cartridge bearings, 12x148mm thru-axle, 28h
DT Swiss Industry
Front: Butcher, GRID casing, GRIPTON® compound, 2Bliss Ready, 29x2.3"
Rear: Purgatory, GRID casing, GRIPTON® compound, 2Bliss Ready, 29x2.3"
SRAM NX Eagle, DUB, 170mm - Steel, 30T
SRAM DUB, threaded BB
SRAM NX Eagle, 12-speed
SRAM NX Eagle, 12-speed, 11-50t
SRAM NX Eagle, 12-speed
SRAM NX Eagle, trigger, 12-speed
Specialized, 6061 alloy, 6-degree upsweep, 8-degree backsweep, 27mm rise, 780mm width
Specialized Sip grip, half-waffle, S/M: regular thickness, L/XL: XL thickness
Specialized Trail, 3D-forged alloy, 4-bolt, 6-degree rise
SRAM Guide R, hydraulic disc, organic pads, Guide S4 4-piston calliper, 200/180mm
SRAM Guide R
Body Geometry Phenom Comp, hollow Cr-Mo rails, 143mm
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
Specifications correct at time of data entry sourced from official documentation, whilst rare sometimes manufactures will change a specification without notifying their dealers.
Stumpjumper Size Guide
||158 - 165
||5'2" - 5'5"
||165 - 178
||5'5" - 5'10"
||178 - 185
||5'10" - 6'1"
||185 - 193
||6'1" - 6'4"
Sizing charts provided as a guide, we recommend you contact us or better still, visit our store for advice.