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Ever had a ride that felt more like an experience than a ride? Us, too, and we've been chasing that feeling ever since. With the Stumpjumper Expert 29, we've come up with that feeling and put it into a new frame design that's so in tune with the trail. Seriously, it's going to make you rethink how to ride a bike.
Our design goal for the new Stumpjumper was simple-build the ultimate trail bike, one that feels telepathic. And it turns out that feeling all comes down to stiffness. Thinking of it this way: when the frame is telling your hands one thing and 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 making our own mountain-specific stiffness tests, and then we went to 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 those 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 the middle of the adjustment spectrum, and this gives you the greatest possible range to fine-tune your ride. Rx Tune for each platform. So, no matter what size you prefer, you'll get perfectly linear suspension.
Steps were taken to make this bike easy to live with. Threaded bottom brackets make a triumphant return, and we made room for a 3.0 "tire, so you're free to run whatever you want after using standard metric shocks, we revamped the SWAT ™ box, too, making it sleeker, lighter, and with more volume 6mm and slackens the head tube by half-a-degree Little details so you jump out to surprise you, like a newly designed ribbed chainstay protector that makes chain slap a thing of the past and almost silences the drivetrain No more lazy loop, hidden stashes of magnets, pokey spokes, more about the carbon frame or pillows to cry in.
SRAM GX1 Eagle drivetrain, SRAM Guide R disc brakes, RockShox front and rear suspension (150 / 140mm of travel respectively), and Roval Traverse Carbon 29 wheels.