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2019 Men's Stumpjumper ST Expert 29

4.7

6 Reviews

Trail bikes can't usually 'shred the gnarly stuff' and 'climb with your XC buddies,'…

The All-New Stumpjumper

Product Details

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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 2.6" 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 an 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.

Technical Specifications

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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

SUSPENSION

FORK

RockShox Pike RC, DebonAir, rebound / low-speed compression adjust, tapered steerer, 51mm offset, 15mm Maxle® Stealth thru-axle, 15x110mm Boost™, 130mm of travel

REAR SHOCK

RockShox Deluxe RT3, Rx Trail Tune, rebound & 3-position compression adjust, 190x42.5mm

COCKPIT

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, 40mm

GRIPS

Specialized Sip grip, half-waffle, S/M: regular thickness, L/XL: XL thickness

SADDLE

Body Geometry Phenom Comp, hollow Cr-Mo rails, 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

SEAT BINDER

Specialized bolt-type, alloy, 38.6mm

BRAKES

FRONT BRAKE

SRAM Guide R, hydraulic disc, organic pads, Guide S4 4-piston caliper, 200mm

REAR BRAKE

SRAM Guide R, hydraulic disc, organic pads, Guide S4 4-piston caliper, 180mm

DRIVETRAIN

SHIFT LEVERS

SRAM GX Eagle, trigger, 12-speed

REAR DERAILLEUR

SRAM GX Eagle, 12-speed

CASSETTE

SRAM GX Eagle, 12-speed, 10-50t

CRANKSET

Truvativ Descendant, aluminum, Boost™ 148, 170mm crankarm, 24mm spindle

CHAINRINGS

30T

BOTTOM BRACKET

SRAM GXP

CHAIN

SRAM GX Eagle, 12-speed

WHEELS & TIRES

RIMS

Roval Traverse Carbon 29, hookless carbon, 30mm inner width, 28h, tubeless ready, hand-built

FRONT HUB

Specialized, sealed cartridge bearings, 15x110mm spacing, 28h

REAR HUB

Specialized, sealed cartridge bearings, 12x148mm thru-axle, 28h

SPOKES

DT Swiss Industry

FRONT TIRE

Butcher, GRID Casing, GRIPTON® compound, 2Bliss Ready, 29x2.3"

REAR TIRE

Purgatory, GRID casing, GRIPTON® compound, 2Bliss Ready, 29x2.3"

INNER TUBES

Standard, Presta valve

ACCESSORIES

PEDALS

Specialized Dirt

* Weights based on production painted frames as pictured. Actual weights will vary based on colorway, frame size, and component variation. Specifications are subject to change without notice.

Geometry

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SMLXL
Crank Length170MM170MM170MM170MM
Handlebar Width780mm780mm780mm780mm
Stem Length40MM40MM50MM50MM
Saddle Width143mm143mm143mm143mm
Seatpost Length369mm429mm429mm429mm
Stack607mm607mm635mm649mm
Reach415mm435mm455mm480mm
Head Tube Length95mm95mm125mm140mm
Head Tube Angle67.5°67.5°67.5°67.5°
BB Height333mm333mm333mm333mm
BB Drop39mm39mm39mm39mm
Trail99mm99mm99mm99mm
Fork Length, Full540mm540mm540mm540mm
Fork Rake/Offset51mm51mm51mm51mm
Front Center707mm727mm758mm789mm
Chainstay Length437mm437mm437mm437mm
Wheelbase1141mm1161mm1192mm1223mm
Top Tube Length, Horizontal569mm592mm624mm657mm
Bike Standover Height740mm743mm755mm768mm
Seat Tube Length380mm410mm455mm505mm
Seat Tube Angle75.8°75.5°75.1°74.7°
Geometry

Complete Your Ride

Rider Reviews

4.7

6 Reviews

 

East Coast Single Track Slayer

I ride east coast New England trails. They are rocky and involve a lot of climbing. The SL is a climbing machine and rewards you on the way down with snappy tight turns and eats up the chunder. My friends with long travel bikes can't keep up. I have not found the limits of this bike yet. The 29 inch wheels mow over rock gardens and roots. I love this machine.... so much that I bought the Comp Alloy version for my son.


Name:
Jim S.

Helpful?

GREAT PRODUCT- Customer Service a bit lacking

One can understand COVID-19 and the struggles a business would go through, I am a business owner. But not to even answer emails over the course of a week is inexcusable when we spend so much money for our mental health! Really team, ""work"" from home, answer emails...PLEASE! And no, your answer is not in my SPAM folder.


Name:
Br

Helpful?

Fun and Fast

This is my favorite bike to ride! Stand over is nice and roomy for me. pure fun all around as the bike climbs really well, descends like a champ and takes the berms like you own it. Effortlessly chomps away at technical trails. This bike is fun. I swapped out the saddle for the Power Saddle with mimic. You get what you pay for.... A GREAT BIKE with an AMAZING SPEC!


Name:
Karen

Helpful?

Really Good

I have had the bike for 11 months, and its Really good. I am in south florida so no climbing or downhill, just rocky rooty technical trails. I must say full suspension was hard to get used to.....once I dialed in tire pressures it felt amazing. This thing kills it on trail AND more when i do urban assault rides! It jumps really well, is very balanced, and i continue to get faster on the trails. Side note I have done a thousand or so miles on the road and the tires still look brand new, and still grip amazingly well on the trail! Definitely not cheap, but the best spec/price ratio for someone that is not a pro racer. I stuck with specialized partly because the way they handled frame replacement on a carbon hard tail i had.


Name:
R H.

Helpful?

I would definitely recommend this bike!

This is a great do everything bike! The Stumpjumper ST (29 Expert) climbs well, descends great and is just all around fun. It's ready for long days where you have to earn every foot of descent. Even with it's great climbing efficiency, it can still rip on the descents and hold its own. If you only ride park, maybe check out the non-ST version of the bike or the Enduro if you still want a bike you can pedal. But if you live anywhere that requires pedaling to the top, then this bike is a great option. Part spec at the Expert level is solid also. Definitely recommend!


Name:
T J.

Helpful?

The PERFECT trail bike!!

The Stumpjumper ST is a nimble, playful, efficient, and incredibly fun trail bike. Specialized maintained all of the good characteristics of the Camber, and added a modern geometry and stiffer frame, both of which are a noticeable improvement in technical terrain. The head-tube angle (high position) is spot-on for tighter trails where the bike isn't always pointed downhill (think East Coast). This is the perfect do-it-all trail bike!!


Name:
Ne R.

Helpful?