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2021 Specialized Stumpjumper S-Works

Vital Rating: (Outstanding)
2021 Stumpjumper S-Works (Redwood/Smoke/Carbon)
2021 Specialized Stumpjumper S-Works 2021 Specialized Stumpjumper S-Works 2021 Specialized Stumpjumper S-Works 2021 Specialized Stumpjumper S-Works 2021 Specialized Stumpjumper S-Works 2021 Specialized Stumpjumper S-Works
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Is This the Benchmark Trail Bike? The All-New Specialized Stumpjumper Line

Massive geometry and size updates along with a new suspension character bring the feature-rich Stumpjumper into the limelight.

Rating: Vital Review
Is This the Benchmark Trail Bike? The All-New Specialized Stumpjumper Line

With the recent release of the new Stumpjumper EVO, riders had to know a revised Stumpjumper was on the way. Today, Specialized delivered the goods. For the latest iteration of the hallmark line, Specialized sought to save weight, improve ride qualities and ultimately produce what they believe to be the epitome of today's trail bike. Whether they've succeeded is a matter of opinion to many, but Specialized has made a strong case for themselves with the new Stumpjumper line.


Stumpjumper Highlights

  • All-new carbon and alloy frames
  • 29-inch wheels only (ability to run 27.5-inch rear)
  • 130mm (5.1-inch) rear travel
  • 190x45mm rear shock
  • 140mm (5.5-inch) front travel
  • Carbon models feature larger SWAT compartment
  • All six build kits are 12-speed with dropper posts
  • Six size options (S1-S6)
  • Internally routed cables on both frame materials
  • Integrated, rubber molded protection on chainstay and down tube

What's New

A first look at the new Stumpjumper won't have much jumping out in the visuals department, most of what Specialized went after isn't readily apparent and lives more on charts and spreadsheets. Starting at the rear of the bike, the first standout is the absence of the Horst link. The new Stumpjumper has flexstays instead. Specialized went this route for numerous reasons, including a small weight savings and less maintenance due to fewer pivots.



From a performance standpoint, the engineering team sought to use carbon tuning in the flexstays to better improve overall ride qualities. When the rear shock is installed, the stays are somewhat preloaded and act as a negative spring of sorts. When the bike is at sag the force from the flex stay is neutral. Certainly the most standout point of the carbon tuning Specialized put into the new Stumpjumper, but certainly not the only bit. Throughout the bike, there are various carbon layups used to create a frame that Specialized states is stiffer for some on-trail riding forces (like pedaling and big hits) and more compliant for retaining traction in other on-trail situations. We know you've heard this from numerous brands, on countless bikes. Whether Specialized delivered on this promise with the Stumpjumper will be divulged in time.


In a quest to further improve the Stumpjumper's trail manners, Specialized went with an interesting shock tune on the rear FOX shocks. On the compression side, the shocks feature a light, linear tune to help the Stumpjumper line make use of the full 130mm if rear travel. Inside the FOX shock is a digressive piston with a dished head that adds a natural preload to the shim stack. The idea is to have enough low-speed compression without over-producing high-speed compression and a harsh ride. If riders want more ramp, they can add volume spacers to the shock. On the rebound side of the shock, the tune is light off the top but upon return from a deeper stroke of the travel, it will be slowed down. Specialized wanted the Stumpjumper to have a lively feel for small hits but not buck riders off larger compressions.




While the shapes of the new Stumpjumper are familiar, their proportions have been changed quite a bit. Much like the new EVO line, the Stumpy line has moved to the S sizing system, giving riders six size choices. This sizing method is more than just a rebranding of the old t-shirt sizing mentality and does give riders more options on what size bike they can ride. If you prefer the prior sizes, those still exist, albeit with some minor tweaks. Riders looking for the longer feel of today's trends will easily find and fit on the corresponding size. For example, last year's medium held a 425mm reach and 410mm seat tube. This year's S2 has a 430mm reach, the S3 has a 450mm reach and still only a 405mm seat tube. If you want to get really wild, the S4 has a 475mm reach and the seat tube only grows to 415mm, giving many riders three sizing options to find what they are looking for.


Jumping into geometry a bit more, nearly every number has changed with the new Stumpjumper. Examining the bike in the slack setting, the new 65-degree head angle is kept in check by a 44mm reduced-offset fork. The seat tube angle is steepened to 76-degrees and the chainstays are somewhat size-specific with the four smallest sizes sporting a 432mm length and the largest two at 442mm. As mentioned, seat tubes across the board are shorter, meaning that depending on what size riders pick, reach numbers have grown significantly across the board.



There is, however, one number that is missing from the Stumpjumper line: 27.5. Specialized noted that because the new Stumpy has a lower standover and a more-catered geometry, along with shop requests and general sales numbers, they did not see a point in making a 27.5-inch wheeled version. If riders want to run a mullet (27.5 rear, 29 front) bike, that option does exist.

Build Kits


Specialized offers the Stumpjumper line in six build options, two are alloy, four are carbon. Riders can jump into the lineup for $2,199 with the Stumpjumper Alloy which will yield a SRAM SX Eagle drivetrain and entry-level suspension from RockShox and X-Fusion. For a thousand dollars more, riders get SRAM's NX drivetrain and a massive upgrade to G2 brakes and FOX suspension. Compared to the 2020 line, this is a slight drop in price. Carbon models start with the Comp at $3,999 and escalate from there, all the way to the S-Works, which is what Specialized sent us.


Full disclosure, it is highly unlikely that any of us at Vital would shell out the $9,499 for the SRAM AXS, FOX Factory suspended bike that we tested. That said, it merits saying that this is a drop in price over the 2020 S-Works AXS model, so there's that. To look at the full line, with specs and pricing, head to our Product Guide where we have it laid out for you.

Stumpjumper Alloy - $2,199
Stumpjumper Alloy Comp - $3,199
Stumpjumper Comp - $3,999

S-Works Frame - $2,799

Stumpjumper Expert - $4,699
Stumpjumper Pro - $6,999
S-Works - $9,499

First Impressions On the Trail

Vital tester, Kevin Lillywhite, has been making his way through a slew of new 29ers lately. At 5-foot 11-inches, he typically opts for a large and in the case of the Stumpjumper, he rode an S4. Kevin has some background with the prior generation of Stumpjumper and used this to extract some straight up comparisons between models. While time was limited, Kevin did make a few immediate notes. First was a perceptible increase in torsional stiffness with the new model. The new suspension curve gave the Stumpjumper an improved trail feel, with better feedback, pop, and pedaling efficiency. Something that Kevin could not decipher was the presence of flex stays over the traditional Horst link. Ultimately, that may be a compliment. As we move through the long-term review, we'll see how the bike holds up and how our impressions of the bike evolve.


When Specialized presented the new Stumpjumper they came at us strong, with bold promises of an incredible new ride. Did they deliver? It's too early in our testing to draw any definitive conclusions but so far, we have to say things are off to a strong start. The new Stumpjumper makes use of thoughtfully crafted details beyond just marketing-speak that deliver an on-trail feel that riders will appreciate. Hustle over to or your local dealer to get a look for yourself.



Product Specialized Stumpjumper S-Works
Model Year 2021
Riding Type Trail
Rider Unisex
Sizes and Geometry
S1 (High, Low), S2 (High, Low), S3 (High, Low), S4 (High, Low), S5 (High, Low), S6 (High, Low) View Geometry
Size S1 (High, Low) S2 (High, Low) S3 (High, Low) S4 (High, Low) S5 (High, Low) S6 (High, Low)
Top Tube Length 563 583 605 632 660 692
Head Tube Angle 65.5°, 65° 65.5°, 65° 65.5°, 65° 65.5°, 65° 65.5°, 65° 65.5°, 65°
Head Tube Length 95 100 110 120 130 140
Seat Tube Angle 76.5°, 76° 76.5°, 76° 76.5°, 76° 76.5°, 76° 76.5°, 76° 76.5°, 76°
Seat Tube Length 385 385 405 425 445 465
Bottom Bracket Height 335, 328 (40, 47 drop) 340, 333 (35, 42 drop) 340, 333 (35, 42 drop) 340, 333 (35, 42 drop) 340, 333 (35, 42 drop) 340, 333 (35, 42 drop)
Chainstay Length 432 432 432 432 442 442
Wheelbase 1152 1175 1200 1228 1268 1302
Standover 730 734 744 749 757 757
Reach 415, 410 435, 430 455, 450 480, 475 505, 500 535, 530
Stack 610, 614 609, 613 618, 622 627, 632 636, 641 646, 650
* Additional Info Measurements are in mm unless otherwise noted
High and Low adjustable geometry via a FlipChip in the rear shock eye
Wheel Size 29"
Frame Material Carbon Fiber
Frame Material Details FACT 11m carbon chassis and rear-end, asymmetrical design
Rear Travel 130mm
Rear Shock FOX FLOAT DPS Factory, Rx Trail Tune, EVOL Air sleeve, Kashima coat, 3-position adjustment with Open Mode adjustment
Size S1: 190x42.5mm, sizes S2-S6: 190x45mm
Fork FOX FLOAT 34 Factory, GRIP2 damper, Kashima coating, 15x110mm, 44mm offset
Fork Travel 140mm
Head Tube Diameter Tapered
Headset 1-1/8" Campagnolo standard compatible upper bearing, 1.5" lower bearing
Handlebar Specialized Trail, FACT Carbon, 6° upsweep, 8° backsweep, 27mm rise, 780mm, 35mm
Stem DEITY Copperhead, 35.0mm
Grips DEITY Knuckleduster, black
Brakes SRAM G2 Ultimate, 4-piston caliper, hydraulic disc, 200mm front / 180mm rear rotors
Brake Levers SRAM G2 Ultimate
Drivetrain 1x
Shifters SRAM XX1 Eagle AXS remote
Front Derailleur N/A
Rear Derailleur SRAM XX1 Eagle AXS
ISCG Tabs ISCG 05 (2-bolt)
Chainguide Top guide
Cranks SRAM XX1 Eagle, DUB
Size S1:165mm, sizes S2-S5: 170mm, size S6: 175mm
Chainrings 30 tooth, steel
Bottom Bracket Threaded
Pedals N/A
Chain SRAM XX1, 12-speed
Cassette SRAM XX1, 12-speed
Rims Roval Control 240, hookless carbon, 29mm inner width, hand-built, 2Bliss Ready
Hubs Front: DT Swiss 240, sealed cartridge bearings, 15x110mm spacing, 28 hole
Rear: DT Swiss 240, Ratchet EXP, 36-tooth engagement, SRAM XD driver body, 12mm thru-axle, 148mm spacing, 28 hole
Spokes DT Swiss Competition Race
Tires Front: Specialized Butcher, GRID casing, GRIPTON compound, 29"x2.3"
Rear: Specialized Purgatory, GRID casing, GRIPTON compound, 29"x2.3"
Saddle Specialized Bridge, 155/143mm, hollow Ti-rails
Seatpost RockShox Reverb AXS, 1X remote
Travel on size S1:100mm, S2: 125mm, S3: 150mm, S4-S6: 170mm
Seatpost Diameter 34.9mm
Seatpost Clamp Single bolt
Rear Dropout / Hub Dimensions 12mm x 148mm Boost
Max. Tire Size 29" x 2.6"
Bottle Cage Mounts Yes, with SWAT cage
Colors Gloss Black / Carbon
Satin Redwood / Smoke / Carbon
Warranty Limited lifetime frame and wheels, 2 years Specialized components
Weight N/A
  • S-Sizing is style-specific sizing – choose your frame size to complement your riding style, not your inseam
  • Flexstay flex zone along the seatstay serves up 130mm of travel without rear-end pivot hardware or redundant material required for bonding pivot parts in the carbon
  • One-piece design improves torsional and lateral stiffness, which in turn enhances responsiveness and pedaling efficiency
  • The Stumpjumper has a very progressive leverage rate with a steep slope
  • A FlipChip in the rear shock eye allows you to change bottom bracket height by 7mm and headtube angle by one-half degree
  • A size S-4 Stumpjumper chassis is 2,250 grams (including paint, shock, assembly hardware, molded downtube and chainstay protectors, axle, and seat clamp)
  • Increased SWAT volume and added a hidden 22-oz. SWAT Bladder
  • Fully enclosed internal cable routing, sealed cartridge bearing pivots, and replaceable derailleur hanger
  • Price $9,500
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