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We've heard it all before: 'This bike's for going fast, that one's for having fun.' 'This one pedals well, that one shreds.' Why not make one bike that does everything well? Well, we did, and it's called the S-Works Stumpjumper. Unrivaled handling and stiffness, sublime suspension kinematics, and a complete abandon of proprietary nonsense—it rides like a dream. And with 29-inch wheels, you're free to climb and descend at the hyper speed that 29ers are known for.
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 3.0' 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.
As with every S-Works build, this S-Works Stumpjumper 29 comes with only top-of-the-line parts, like a full SRAM XX1 Eagle drivetrain, SRAM Guide RSC disc brakes, FOX Factory front and rear suspension (150/140mm respectively), and the best carbon wheels money can buy, the Roval Traverse SL 29.
|CHAIN||SRAM XX1 Eagle, 12-speed w/ PowerLock®|
|BOTTOM BRACKET||SRAM GXP|
|CRANKSET||SRAM XX1 Eagle, Boost™ 148, 170mm crankarm, 24mm spindle|
|SHIFT LEVERS||SRAM XX1 Eagle, trigger, 12-speed|
|CASSETTE||SRAM XG-1295 Eagle, 12-speed, 10-50t|
|REAR DERAILLEUR||SRAM XX1 Eagle, 12-speed|
|FORK||FOX 36 29" 150mm FACTORY|
|REAR SHOCK||FOX FLOAT DPX2 Factory, Rx Trail Tune, EVOL Air sleeve, Kashima Coat, 3-position adjustment w/ Open Mode adjustment, 210x50mm|
|FRONT HUB||Roval Traverse, sealed cartridge bearings, 15mm thru-axle, 110mm spacing, 24h|
|REAR HUB||Roval Traverse, DT Swiss Star Ratchet, 54t engagement, SRAM XD driver body, 12mm thru-axle, 148mm spacing, 28h|
|INNER TUBES||Standard, Presta valve|
|SPOKES||DT Swiss Revolution|
|RIMS||Roval Traverse SL 29, hookless carbon, 30mm inner width, 24h/28h, tubeless ready, hand-built|
|FRONT TIRE||Butcher, GRID casing, GRIPTON® compound, 2Bliss Ready, 29x2.6"|
|REAR TIRE||Purgatory, GRID casing, GRIPTON® compound, 2Bliss ready, 29 x2.6"|
|SADDLE||Body Geometry Phenom Expert, Adaptive Edge design, hollow titanium rails, carbon fiber base, 143mm|
|SEATPOST||Command Post IRcc, 16-position micro-height adjustable, two-bolt head, bottom mount cable routing, remote SRL lever, 34.9mm, S: 130mm, M/L/XL: 160mm of travel|
|STEM||Syntace MegaForce 2, 6-degree, 31.8mm clamp|
|HANDLEBARS||Specialized Trail, FACT carbon, 6-degree upsweep, 8-degree backsweep, 27mm rise, 780mm, 31.8mm|
|GRIPS||Specialized Sip Grip, half-waffle, S/M: regular thickness, L/XL: XL thickness|
|FRONT BRAKE||SRAM Guide RSC, hydraulic disc, organic pads, Guide S4 4-piston caliper, 200mm rotor|
|REAR BRAKE||SRAM Guide RSC, hydraulic disc, organic pads, Guide S4 4-piston caliper, 180mm rotor|
|SEAT BINDER||Alloy, 38.6mm|
|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, 140mm of travel|
|Top Tube Length, Horizontal||572mm||595mm||628mm||662mm|
|Seat Tube Angle||74.8°||74.5°||74.1°||73.7°|
|Head Tube Angle||66.5°||66.5°||66.5°||66.5°|
|Seat Tube Length||380mm||410mm||455mm||505mm|
|Head Tube Length||95mm||95mm||125mm||140mm|
|Bike Standover Height||747mm||750mm||762mm||775mm|
|Fork Length, Full||560mm||560mm||560mm||560mm|