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Specialized S-works Stumpjumper 29er Frame Only 2019
We’ve heard it all before: “This bike’s for going fast that one’s for having fun.” “This one pedals well that one shreds.” Why not make one bike that does everything well? Well we did and its called the S-Works Stumpjumper. Unrivaled handling and stiffness sublime suspension kinematics and a complete abandon of proprietary nonsense—it rides like a dream. And with 29-inch wheels you’re free to climb and descend at the hyper speed that 29ers are known for.
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 frames 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 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 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. As with every S-Works build this S-Works Stumpjumper 29 comes with only top-of-the-line parts like a full SRAM XX1 Eagle drivetrain SRAM Guide RSC disc brakes FOX Factory front and rear suspension (150/150mm respectively) and the best carbon wheels money can buy the Roval Traverse SL 29. The Stumpjumpers asymmetrical FACT 11m carbon fiber construction is lightweight stiff and ready to take on the trail. Its built off our 29 Trail Geometry so its just the right amount of both capable and comfortable. And with SWAT™ integration in the down tube a threaded BB easy cable routing
and an all new chain silencer its ready for anything the trail or you throw at it. FOX FLOAT DPX2 Factory has three modes—Open Trail and Firm—that control large compression adjustments on-the-fly. Theres also a tool adjust compression adjustment that allows for fine-tuning of the compression in Open mode. SPECS & GEOS 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 140mm of travel REAR SHOCK FOX FLOAT DPX2 Factory Rx Trail Tune EVOL Air sleeve Kashima Coat 3-position adjustment w/ Open Mode adjustment 210x50mm SEAT BINDER Specialized bolt-type alloy 38.6mm
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 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 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. As with every S-Works build this S-Works Stumpjumper 29 comes with only top-of-the-line parts like a full SRAM XX1 Eagle drivetrain SRAM Guide RSC disc brakes FOX Factory front and rear suspension (150/150mm respectively) and the best carbon wheels money can buy the Roval Traverse SL 29. The Stumpjumpers asymmetrical FACT 11m carbon fiber construction is lightweight stiff and ready to take on the trail. Its built off our 29 Trail Geometry so its just the right amount of both capable and comfortable. And with SWAT™ integration in the down tube a threaded BB easy cable routing
and an all new chain silencer its ready for anything the trail or you throw at it. FOX FLOAT DPX2 Factory has three modes—Open Trail and Firm—that control large compression adjustments on-the-fly. Theres also a tool adjust compression adjustment that allows for fine-tuning of the compression in Open mode. SPECS & GEOS 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 140mm of travel REAR SHOCK FOX FLOAT DPX2 Factory Rx Trail Tune EVOL Air sleeve Kashima Coat 3-position adjustment w/ Open Mode adjustment 210x50mm SEAT BINDER Specialized bolt-type alloy 38.6mm
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