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Specialized Men's Stumpjumper ST Expert 29 - 2019

Specialized Men's Stumpjumper ST Expert 29
  • Color: Satin/Carbon/Black
  • Color: Satin/Dusty Turquoise/Team Yellow
$5,000.00
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Details

Trail bikes can't usually 'shred the gnarly stuff' and 'climb with your XC buddies,' but we're confident in saying that the Stumpjumper Expert ST 29 is totally capable of both. It combines precise handling, perfect suspension kinematics, and a complete abandon of proprietary nonsense with a slightly steeper geometry, less travel (130mm front/120mm rear), and 29-inch wheels to make it a true 'do-it-all' trail bike.

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.

For the build, you get a solid components package with a full SRAM GX1 Eagle drivetrain, SRAM Guide R disc brakes, RockShox Pike RC fork and a Deluxe RT3 rear shock (130/120mm of travel respectively), and Roval Traverse Carbon 29 wheels.

- 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 a brand new chain silencer, it's ready for anything the trail, or you, throw at it.

- With three different compression adjustments—open/pedal/lock—incredible damping performance, and our Rx Trail Tune, the RockShox Deluxe RT3 perfectly complements the Stumpjumper.

- RockShox's Pike is known for its trail performance, and the RC found here has stiff stanchions, a Charger damper, and plenty of sensitivity.

Specs

Frame FACT 11m, full carbon chassis and rear end, asymmetrical design, 29 Trail Geometry, SWAT Door integration, threaded BB, fully enclosed internal cable
Fork RockShox Pike RC, DebonAir, rebound / low-speed compression adjust, tapered steerer, 51mm offset, 130mm of travel
Axles Front: 15x110mm Boost
Rear: 12x148mm thru-axle
Rims/Wheels Roval Traverse Carbon 29, hookless carbon, 30mm inner width, 28h, tubeless ready, hand-built
Hubs Specialized, sealed cartridge bearings, 28h
Spokes DT Swiss Industry
Tires Front: Butcher, GRID Casing, GRIPTON compound, 2Bliss Ready, 29x2.3"
Rear: Purgatory, GRID casing, GRIPTON compound, 2Bliss Ready, 29x2.3"
Crankset Truvativ Descendant, aluminum, Boost 148, 170mm crankarm, 24mm spindle
Chainrings 30T
Bottom Bracket SRAM GXP
Chain SRAM GX Eagle, 12-speed
Rear Derailleur SRAM GX Eagle, 12-speed
Cassette/Rear Cogs SRAM GX Eagle, 12-speed, 10-50t
Shifters SRAM GX Eagle, trigger, 12-speed
Handlebars Specialized Trail, 7050 alloy, 8-degree backsweep, 6-degree upsweep, 27mm rise, 780mm, 31.8mm clamp
Stem Specialized Trail, forged alloy, 4-bolt, 5mm rise
Brakes SRAM Guide R, hydraulic disc, organic pads, Guide S4 4-piston caliper, 200mm/180mm
Pedals Specialized Dirt
Saddle Body Geometry Phenom Comp, hollow Cr-Mo rails, 143mm
Seat Post 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

* Subject to change without notice.

Part Numbers

Option UPC MPN Store SKU
Satin/Carbon/Black / Small 888818492817 93218-3702
Satin/Carbon/Black / Medium 888818492848 93218-3703 91574
Satin/Carbon/Black / Large 888818492794 93218-3704 91573
Satin/Carbon/Black / X-Large 888818492664 93218-3705 91481
Satin/Dusty Turquoise/Team Yellow / Small 888818492688 93218-3802
Satin/Dusty Turquoise/Team Yellow / Medium 888818492800 93218-3803 93377

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