S-Works Stumpjumper ST 29
$11,839.00
Part No.  

S-Works Stumpjumper ST 29

$11,839.00
Part No.  
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S-Works Stumpjumper ST 29
Overview
Technical Specifications
Geometry

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.

Technical Specifications

DRIVETRAIN
BOTTOM BRACKET SRAM GXP
CHAIN SRAM XX1 Eagle, 12-speed
CRANKSET SRAM XX1 Eagle, Boost™ 148, 170mm crankarm, 24mm spindle
SHIFT LEVERS SRAM XX1 Eagle, trigger, 12-speed
CASSETTE SRAM X01 Eagle, 12-speed, 10-50t
CHAINRINGS 30T
REAR DERAILLEUR SRAM XX1 Eagle, 12-speed
SUSPENSION
FORK FOX FLOAT 34 Factory, FIT4 damper, 3-position adjustment, Kashima Coating, 15x110mm Kabolt axle, 51mm offset, 130mm of travel
REAR SHOCK FOX FLOAT DPS Factory, Rx Trail Tune, EVOL Air sleeve, Kashima Coat, 3-position adjustment w/ Open Mode Adjustment, 190x42.5mm
COCKPIT
SADDLE Body Geometry Phenom Expert, hollow titanium rails, carbon fiber base, 143mm
SEAT BINDER Alloy, 38.6mm
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
HANDLEBARS 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
WHEELS & TIRES
FRONT HUB Roval Traverse SL, sealed cartridge bearings, 15mm thru-axle, 110mm spacing, 24h
REAR HUB Roval Traverse SL, 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, tubeless ready, hand-built, 24/28h
FRONT TIRE Butcher, GRID Casing, GRIPTON® compound, 2Bliss Ready, 29x2.3"
REAR TIRE Purgatory, GRID casing, GRIPTON® compound, 2Bliss Ready, 29x2.3"
FRONT WHEEL WH-TRAVERSE SL 29 148 XX1 OHLINS
BRAKES
FRONT BRAKE SRAM Guide RSC, hydraulic disc, organic pads, Guide S4 4-piston caliper, 200mm
REAR BRAKE SRAM Guide RSC, hydraulic disc, organic pads, Guide S4 4-piston caliper, 180mm
ACCESSORIES
PEDALS Specialized Dirt
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
The All-New Stumpjumper
The All-New Stumpjumper

Geometry

Geometry Chart

Stumpjumper ST - Geometry

S M L XL
  S M L XL
Crank Length 170MM 170MM 170MM 170MM
Stem Length 40MM 40MM 50MM 50MM
Seatpost Length 369mm 429mm 429mm 429mm
Saddle Width 143mm 143mm 143mm 143mm
Handlebar Width 780mm 780mm 780mm 780mm
Reach 415mm 435mm 455mm 480mm
Top Tube Length, Horizontal 569mm 592mm 624mm 657mm
Stack 607mm 607mm 635mm 649mm
Wheelbase 1141mm 1161mm 1192mm 1223mm
Chainstay Length 437mm 437mm 437mm 437mm
Front Center 707mm 727mm 758mm 789mm
BB Drop 39mm 39mm 39mm 39mm
BB Height 333mm 333mm 333mm 333mm
Seat Tube Angle 75.8° 75.5° 75.1° 74.7°
Head Tube Angle 67.5° 67.5° 67.5° 67.5°
Seat Tube Length 380mm 410mm 455mm 505mm
Head Tube Length 95mm 95mm 125mm 140mm
Bike Standover Height 740mm 743mm 755mm 768mm
Fork Rake/Offset 51mm 51mm 51mm 51mm
Fork Length, Full 540mm 540mm 540mm 540mm
Trail 99mm 99mm 99mm 99mm