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2018 Specialized Mens S-Works Stumpjumper ST 29
We love the fast and planted feeling of the new Stumpjumper, but not everyone needs 150mm of travel. And if you're in the market for a trail bike that's more nimble and snappy in hard accelerations and long climbs, the S-Works Stumpjumper ST 29 should be your first choice. Its shorter travel (130mm front/120mm rear), and slightly steeper geometry, bring out the true "feel" of the trail-making popping off lips and railing berms even more lively and fun.
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.
The build features only top-of-the-line parts, like a full SRAM XX1 Eagle drivetrain, SRAM Guide RSC disc brakes, FOX Factory front and rear suspension (130/120mm respectively), and the best carbon wheels money can buy, the Roval Traverse SL 29s.
- The Stumpjumper ST's asymmetrical, FACT 11m carbon fiber construction is lightweight, stiff, and ready for technical climbs and rowdy descents. It's built off of our 29 Trail Geometry, so it's both capable and comfortable. And with SWAT™ integration in the down tube, a threaded BB, easy cable routing, and an brand new chain silencer, it's ready for anything the trail, or you, throw at it.
- The FOX DPS Factory rear shock features our Rx Trail Tune, ensuring that no matter the wheel or frame size, your bike is dialed-in perfectly.
- With the legendary FIT4 damper, large and lightweight stanchions, and buttery-smooth Kashima coating, the FOX 34 Factory 130mm fork is one of the best out there.
|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|
|Front Tire||Butcher, GRID Casing, GRIPTON|
|Rear Brake||SRAM Guide RSC, hydraulic disc, organic pads, Guide S4 4-piston caliper, 180mm rotor|
|Seat Binder||Specialized bolt-type, alloy, 38.6mm|
|Fork||FOX FLOAT 34 Factory, FIT4 damper, 3-position adjustment, Kashima Coat, 15x110mm Kabolt axle, 51mm offset, 130mm of travel|
|RearShock||FOX FLOAT DPS Factory, Rx Trail Tune, EVOL Air sleeve, Kashima Coat, 3-position adjustment w/ Open Mode Adjustment, 190x42.5mm|
|Front Brake||SRAM Guide RSC, hydraulic disc, organic pads, Guide S4 4-piston caliper, 200mm rotor|
|Shift Levers||SRAM XX1 Eagle, trigger, 12-speed|
|Rear Derailleur||SRAM XX1 Eagle™, 12-speed|
|Cassette||SRAM X01 Eagle, 12-speed, 10-50t|
|Chain||SRAM XX1 Eagle, 12-speed w/ PowerLock|
|Crankset||SRAM XX1 Eagle, Boost™ 148, 170mm crankarm, 24mm spindle|
|Bottom Bracket||SRAM GXP|
|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|
|Seat||Body Geometry Phenom Expert, Adaptive Edge design, hollow titanium rails, carbon fiber base, 143mm|
|Bar||Specialized Trail, FACT carbon, 6-degree upsweep, 8-degree backsweep, 27mm rise, 780mm, 31.8mm|
|Stem||Syntace MegaForce 2, 6-degree, 31.8mm clamp|
|Grips||Specialized Sip Grip, half-waffle, S/M: regular thickness, L/XL: XL thickness|
|Tubes||Presta, 40mm valve|
|Rear Tire||Purgatory, GRID casing, GRIPTON|