Stumpjumper Expert Technical Specifications
FRAMESET
Frame
FACT 11m carbon chassis and rear-end, asymmetrical design, 29 Trail Geometry, SWAT™ Door integration, flip chip Head Tube/Bottom Bracket adjustment, threaded BB, fully enclosed internal cable routing, 12x148mm dropouts, sealed cartridge bearing pivots, replaceable derailleur hanger, 130mm of travel
Seat Binder
Alloy, 38.6mm
SUSPENSION
Rear Shock
FOX FLOAT DPS Performance Elite, Rx Trail Tune, EVOL Air sleeve, 3-position adjustment w/ Open Mode Adjustment, 190x45mm
Fork
FOX FLOAT 34 Performance Elite, GRIP2 damper, 15x110mm, 44mm offset, 140mm of travel
COCKPIT
Stem
Alloy Trail Stem, 35mm bar bore
Handlebars
Specialized Trail, 7050 alloy, 8-degree backsweep, 6-degree upsweep, 30mm rise, 780mm, 35mm clamp
Grips
Deity, Knuckleduster, Black
Saddle
Bridge Comp, Hollow Cr-mo rails, 155/143mm
SeatPost
OneUp, Dropper Post-V2, MMX lever, 34.9 (S1:120mm, S2/S3:150mm, S4: 180mm, S5/S6: 210mm)
BRAKES
Front Brake
SRAM G2 RSC, 4-piston caliper, hydraulic disc, 200mm
Rear Brake
SRAM G2 RSC, 4-piston caliper, hydraulic disc, 180mm
DRIVETRAIN
Rear Derailleur
Sram X01 Eagle, 12-speed
Shift Levers
SRAM X01 Eagle, trigger, 12-speed
Cassette
SRAM XG-1295 Eagle, 10-52t
Chain
SRAM GX Eagle, 12-speed
Crankset
SRAM Descendant 7K, DUB, S1:165mm, S2-S5: 170mm, S6: 175mm
Chainrings
Alloy, 30T
Bottom Bracket
SRAM DUB, BSA 73mm, threaded
WHEELS
Rims
Roval Traverse 29 Alloy, 30mm inner width, hand-built, 2Bliss Ready
Front Hub
Roval, sealed cartridge bearings, 15x110mm spacing, 28h
Rear Hub
Roval DT Swiss 370, Ratchet LN, SRAM XD driver body, 12mm thru-axle, 148mm spacing, 28h
Spokes
DT Swiss Competition Race
Front Tire
Butcher, GRID casing, GRIPTON® T7 compound, 29×2.3″
Rear Tire
Purgatory, GRID casing, GRIPTON® T7 compound, 29×2.3″
Inner Tubes
Standard, Presta valve
* Specifications are subject to change without notice
Stumpjumper Expert Geometry
| S1 | S2 | S3 | S4 | S5 | S6 | |
|---|---|---|---|---|---|---|
| Crank Length | 165mm | 170mm | 170mm | 170mm | 170mm | 175mm |
| Handlebar Width | 780mm | 780mm | 780mm | 780mm | 780mm | 780mm |
| Stem Length | 40mm | 40mm | 50mm | 50mm | 50mm | 50mm |
| Saddle Width | 155mm | 155mm | 143mm | 143mm | 143mm | 143mm |
| Seatpost Length | 120mm | 150mm | 150mm | 180mm | 210mm | 210mm |
| Stack (Low BB) | 614mm | 613mm | 622mm | 632mm | 641mm | 650mm |
| Stack (High BB) | 610mm | 609mm | 618mm | 627mm | 636mm | 646mm |
| Reach (Low BB) | 410mm | 430mm | 450mm | 475mm | 500mm | 530mm |
| Reach (High BB) | 415mm | 435mm | 455mm | 480mm | 505mm | 535mm |
| Headtube Length | 95mm | 100mm | 110mm | 120mm | 130mm | 140mm |
| Headtube Angle (Low BB) | 65° | 65° | 65° | 65° | 65° | 65° |
| Headtube Angle (High BB) | 65.5° | 65.5° | 65.5° | 65.5° | 65.5° | 65.5° |
| BB Height (Low BB) | 328mm | 333mm | 333mm | 333mm | 333mm | 333mm |
| BB Height (High BB) | 335mm | 340mm | 340mm | 340mm | 340mm | 340mm |
| BB Drop (Low BB) | 47mm | 42mm | 42mm | 42mm | 42mm | 42mm |
| BB Drop (High BB) | 40mm | 35mm | 35mm | 35mm | 35mm | 35mm |
| Trail (Low BB) | 126mm | 126mm | 126mm | 126mm | 126mm | 126mm |
| Trail (High BB) | 123mm | 123mm | 123mm | 123mm | 123mm | 123mm |
| Fork Length (full) | 550mm | 550mm | 550mm | 550mm | 550mm | 550mm |
| Fork Rake/Offset | 44mm | 44mm | 44mm | 44mm | 44mm | 44mm |
| Front Center | 724mm | 746mm | 770mm | 800mm | 829mm | 863mm |
| Chainstay Length | 432mm | 432mm | 432mm | 432mm | 442mm | 442mm |
| Wheelbase | 1152mm | 1175mm | 1200mm | 1228mm | 1268mm | 1302mm |
| Top-tube Length (horizontal) | 563mm | 583mm | 605mm | 632mm | 660mm | 692mm |
| Bike Standover Height | 730mm | 734mm | 744mm | 749mm | 757mm | 757mm |
| Seat Tube Length | 385mm | 385mm | 405mm | 425mm | 445mm | 465mm |
| Seat Tube Angle (Low BB) | 76° | 76° | 76° | 76° | 76° | 76° |
| Seat Tube Angle (High BB) | 76.5° | 76.5° | 76.5° | 76.5° | 76.5° | 76.5° |
| Max Seatpost Insertion | 220mm | 220mm | 240mm | 260mm | 280mm | 300mm |
| Min Seatpost Insertion | 80mm | 80mm | 80mm | 80mm | 80mm | 80mm |
STUMPJUMPER
SINGLETRACK FLOW FINDER
Combining the lightweight efficient DNA of the Epic EVO with the benchmark handling and capability of the new Stumpjumper EVO, the new Stumpjumper is the ultimate singletrack flow finder. It climbs and accelerates like it has a motor, descends with authority, and flat out tears through every conceivable trail condition. There’s never been an all-round trail bike this light, this efficient, this capable.
The generous cockpit centers you on the bike, improving traction and corner control. The low bottom bracket, slack headtube angle and reduced fork offset keep things stable in the rough. A steep seat tube optimizes power output and climbing balance. Short chainstays keep things nimble.
ADJUSTABLE GEOMETRY
To hone handling to your style and terrain, simply switch the FlipChip at the rear shock eye to change bottom bracket height by 7mm and headtube angle by one-half degree. Low and lax delivers more stability, while high and steep makes for a more nimble ride.
NOTHING IS LIGHTER AND STIFFER
The frame is the backbone of the bike. It’s the origin of control and efficiency, and it’s the centerpiece of any serious weight saving effort. The full Stumpjumper frame assembly* (barely) tips the scales at an unbelievable 5.3 lbs (2,420g), but we didn’t compromise in our quest for light weight. The Stumpy punches above its weight, setting the bar for mid-travel trail bikes in handling characteristics, pedaling efficiency and trail toughness.
*Weight of a production S-4 Stumpjumper frame including paint, shock, assembly hardware, link, carbon extension, molded downtube and chainstay protectors, axle, seat clamp.
The shape of a composite frame determines the vast majority of that frame’s weight, stiffness and durability. After crunching countless Finite Element Analysis calculations, we optimized the shape of each of the Stumpy’s frame tubes and their intersections, eliminating “lazy” material that would otherwise hide in unoptimized corners, thereby ensuring that every fiber is delivering the most strength and stiffness it can. The result is maximum performance and minimal weight.
To achieve breakthrough weight and stiffness goals, the Stumpjumper employs the strongest, most expensive carbon we have ever used in a mountain bike frame. The result? Climbing speed and flickable handling of a lightweight, along with stiffness that delivers wicked pedaling efficiency and telepathic handling. You really can have it all.
Our Rider-First Engineered™ process delivers the optimal balance of tuned stiffness, weight and ride quality from all six sizes, ensuring every rider experiences the same ultimate trail ride characteristics.
SWAT
READY FOR ANYTHING
The SWAT door is a masterpiece of carbon fiber construction and spatial optimization that ensures you’ll be ready for whatever the trail dished out. Conveniently and cleanly stash everything from spare tubes and CO2 cartridges to a windbreaker and a banana (careful with that last one).
SUSPENSION OF DISBELIEF
130mm of Rx-Tuned rear travel delivers a ride feel that is lively and balanced, yet capable of absorbing big hits unlike any other mid-travel trail bike. Thanks to the combination of the progressive leverage ratio and mildly progressive spring rate what you feel on the trail is a playful, snappy ride for the first two-thirds of travel, then – thanks to the increasing spring rate – excellent bump force management and resistance to bottoming in big events. Believe it.
RX TUNE
YOUR PRESCRIPTION FOR FLOW
Our trail obsessed team of engineers stay awake at night thinking of how to make suspension work better. For the Stumpjumper they tailored every aspect that contributes to final suspension characteristics – kinematics, leverage curves, damping and spring rates – to work together in harmony to deliver a highly controlled, responsive and precise ride that handles bump forces like a bike with far more travel.
S-Sizing is based on what matters; rider size and style, not inseam. Six sizes, all with similar headtube lengths and standover allow you to choose the size that best suits your individual style. Smaller S-Size numbers are going to be more nimble, thanks to their shorter reach and front-center measurement, while bigger S-Sizes deliver more stability and a roomier ride.
With our aftermarket MulletLink, you can ride a 27.5” rear wheel to liven up responsiveness and give yourself more room to get rad without hooking your shorts on the rear wheel, all while retaining the geometry and suspension characteristics that enable the Stumpjumper to rip the way it’s meant to.
You won’t realize how much chain-slap was bumming your ride until it’s gone. Our chainstay protector makes the drivetrain virtually silent by disrupting the sine-wave of an unchecked chain clattering away in the rough. The result is the transcendent silence of one hand clapping.
THE ULTIMATE (ALLOY) TRAIL BIKE
Shaped by everything we’ve learned from 40 years of building Stumpjumpers, the alloy Stumps are 100% purebred, cutting edge trail bikes. A look under the hood bears this out: they employ the same benchmark geo, Rx-Tuned suspension, ride quality, and S-sizing as their carbon siblings. So it should come as no surprise that the alloy Stumpjumpers pack a trail performance punch beyond what you’ll find from any other aluminum trail bike.
FINISH AND THE FEELS
The graphics on the Stumpjumpers are inspired by the mountainous terrain that we love to ride. We wanted to capture the way light plays in nature; how it can cast the mountains in jagged relief but also soften and smooth depending on how the light hits, illuminating both hard lines and subtle fades. Multiple coats of ultra-high-quality paint result in a finish so smooth and deep it feels like you could dive into it.
STUMPJUMPER CREATORS
Being tasked with creating the rippingest trail bike we’ve ever made is no small feat. Steve Saletnik, Peter Denk, Matthias Segerer, Chance Ferro, Kayla Clarot, Luke Beemer, Fred Chiu, Tero Jakku, and more than a dozen others dug into every aspect of engineering, suspension dynamics, design, and R&D to do exactly that.
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