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If youre looking for a traditional trail bike youve come to the wrong place. Pack your stuff say your goodbyes and get out. But if youre on the hunt for the perfect shred sled—you know a trail bike that you can take down DH trails huck off blind drops or plow through the rowdiest of rock gardens—youll find yourself right at home on the Stumpjumper EVO Pro 29.
Who exactly is EVO for? EVO is for the shredders—the gnarliest trail riders who live for gravity riding. Big drops huge kickers rocks roots—whatever you throw at it the Stumpjumper EVO can handle it. EVO uses the same style-specific sizing thats featured on our Demo. This sizing lets you choose the bike that fits the way you ride—not just by the seat tube measurement like with most bikes—and it narrows things down to two sizes S2 and S3. These are longer lower slacker and have seat tube and head tube heights that allow you to choose the size that best suits your style and terrain.
We started the construction 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 at the 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. This way youll 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. Youre also free to run whatever aftermarket rear shock you want since were 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 couldnt 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 itll come out the other end. No more lazy loop hidden stashes of magnets pokey spokes or pillows to cry in.
We kept the get gnarly motto going with the build kit of the Stumpjumper EVO Pro specing it with Fox front and rear suspension bomb-proof Roval Traverse Carbon wheels and a 12-speed SRAM GX Eagle groupset.
BOTTOM BRACKET | SRAM DUB threaded BB |
CHAIN | SRAM GX Eagle 12-speed |
CRANKSET | SRAM GX Eagle DUB 170mm |
SHIFT LEVERS | SRAM GX Eagle trigger 12-speed |
CASSETTE | SRAM GX Eagle 12-speed 10-50t |
CHAINRINGS | 30T |
REAR DERAILLEUR | SRAM GX Eagle 12-speed |
FORK | FOX FLOAT 36 Performance Elite GRIP2 damper 15x110mm 44mm offset 150mm of travel |
REAR SHOCK | FOX DHX2 Performance Elite Rx Trail Tune 2-position lever 210x52.5mm S2-500lb spring S3-550lb spring |
SADDLE | Body Geometry Phenom Expert hollow titanium rails carbon fiber base 143mm |
SEAT BINDER | Specialized bolt-type alloy 38.6mm |
SEATPOST | Command Post IRcc 16-position micro-height adjustable two-bolt head bottom mount cable routing remote SRL lever 34.9mm 160mm of travel |
HANDLEBARS | Specialized 7050 alloy 6-degree upsweep 8-degree backsweep 27mm rise 800mm width |
STEM | Specialized Trail forged alloy 4-bolt 5mm rise |
GRIPS | Deity Knuckleduster Black |
FRONT HUB | Specialized sealed cartridge bearings 15x110mm spacing 28h |
REAR HUB | DT Swiss 350 Star Ratchet 36t engagement SRAM XD driver body 12mm thru-axle 148mm spacing 28h |
INNER TUBES | Standard Presta valve |
SPOKES | DT Swiss Industry |
RIMS | Roval Traverse Carbon 29 hookless carbon 30mm inner width hand-built tubeless ready 28h |
FRONT TIRE | Butcher GRID casing GRIPTON® compound 2Bliss Ready 29x2.6 |
REAR TIRE | Butcher GRID casing GRIPTON® compound 2Bliss Ready 29x2.6 |
FRONT BRAKE | SRAM Code RSC 4-piston caliper hydraulic disc 200mm |
REAR BRAKE | SRAM Code RSC 4-piston caliper hydraulic disc 200mm |
PEDALS | Specialized Dirt |
FRAME | FACT 11m full carbon frame asymmetrical design 29 style-specific EVO Trail Geometry SWAT™ Door integration threaded BB fully enclosed internal cable routing 12x148mm dropouts sealed cartridge bearing pivots replaceable derailleur hanger 140mm of travel |
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