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 the 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, & it narrows things down to two sizes s 2 & s 3. These are longer, lower, slacker & have seat tube & head tube heights that allow you to choose the size that best suits your style & terrain. Specialied started the construction by creating thier own mountain-specific stiffness test & then looked at the layout with finite element analysis (fea) to see where they could get the biggest stiffness improvements. This led to a big discovery: the large & x-large frames needed more front-end stiffness, while the smalls & mediums were just fine. They were able to create a frame design that was 20% more efficient. & 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 they developed a radical new sidearm design. The front-end & rear-end are connected at three points & the sidearm helps keep all these points super stiff & connected, all while taking about 100 grams out of the rear-end. More explicitly this minimizes frame flex when the rear suspension is active. They continued down the suspension path with a custom rx trail tune at the rear shock. Suspension performance is highly dependent on frame wheel & rider size so they use the rx tune to get each bike to land in the middle of the adjustment spectrum & 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, they 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 & theyve made room for up to a 3.0" tire. Youre also free to run whatever aftermarket rear shock you want since theyre using standard metric shocks. They revamped the SWAT box too, making it sleeker, lighter & with more volume. Customization is furthered with a flip chip that lets you dial-in your stumpy to your riding style. Switch it from high to low & it drops your bottom bracket 6mm & 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 & nearly silences the drivetrain. Lastly, cable routing couldnt be any easier on carbon models. Full tubes can be found throughout the carbon frame so all you have to do is push the cable & itll come out the other end. No more lazy loops, hidden stashes of magnets, pokey spokes or pillows to cry in. They kept the "get gnarly" motto going with the build kit of the Stumpjumper Evo Pro, specing it with Fox front & rear suspension, bomb-proof Roval traverse carbon wheels & a 12-speed SRAM GX Eagle groupset.