Specialized Releases 3 New Stumpjumpers

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REAL-WORLD TESTING

We loved the last Stumpjumper, but we can admit that it didn’t want to party when situations got a little hairy. We wanted to push it harder, and after identifying that this was really the result of a lack of stiffness, we developed our own mountain-specific stiffness test that examined the connection between a rider’s hands and feet. When each get different signals, you get confused. Extensive field testing was performed in order to fine-tune the front end stiffness.

Our team would go ride a working version of the frame, provide feedback, and then we’d overwrap the frame with carbon plies, test it in the lab to record the stiffness values, and then give it back to the rider. We did this exact fine-tuning process over and over until we hit the perfect balance of stiffness and handling. And the result is a bike that feels like it’s riding on rails. Point it where you want, and you’re going there. This is Rider First Engineered™ for mountain, and it delivers the ultimate trail ride—regardless of size.

ALL-NEW SIDEARM FRAME

We pulled out all the stops to lighten and stiffen up the frame, and what we arrived at was a vastly more efficient structure with a new sidearm design. The sidearm design directly connects all three mounting points of the rear end and shock to the frame, and this creates a significant increase in both stiffness and performance over bumps.

More explicitly, frame flex has been minimized when the rear suspension is active. In CAD, we were able to put the new 3D shape against the last iteration of the Stumpjumper, and with Finite Element Analysis (FEA), we were able to prove that the new layout was 20% more efficient. At the end of all of this, we’ve ended up with one of the lightest trail frames on the market.

A NEW FRAME YIELDS A NEW APPROACH

With over two decades of experience with FSR, we refined our proven design. We love it, because FSR allows us to tune every part of the suspension with the least amount of compromises. Bike suspension is a marriage between the frame kinematics and the shock, after all.

And given that we have our own Suspension Team, we had them working hand-in-hand with the frame engineers on the bike design from day one. Because of this union, we’re now able to rely more on the frame kinematics and less on the shock damper. What does this mean for the ride? Well, it’s now supple for the small bumps, with a firm mid-stroke and exceptional bottom-out support. This is the suspension that makes the Ultimate Trail Bike

RX TUNE

Every shock and fork gets a custom tune. Our in-house Suspension Team adjusts every shock to ensure that it’s perfectly paired for the specific kinematics of your bike, so it’ll ride in the sweet spot with an ideal range of adjustability.

We do this by adjusting the shim stacks for both compression and rebound, as well as by adjusting the air volume ratios. The aim is to land in the middle of the adjustment spectrum, so you can still fine-tune to your heart’s content.

ULTIMATE ADJUSTABILITY

This is the best mountain bike we’ve ever made when it comes to customizing it however you want. All of the configurations use standard stroke and eye-to-eye metric shocks, so you won’t find Shock Block anywhere. So yeah, if you want to swap shocks—be our guest. You won’t have any problems from us or the Stumpjumper.

We’ve also ditched the PF30 bottom bracket of yesteryear in favor of moving back to a threaded BB system, and both 27.5 and 29 frames can fit up to 3.0” tires, now. You’ll still want to check with your fork manufacturer to make sure a high-volume tire can fit, but this should be music to everyone’s ears.

FLIP CHIP

The Flip Chip allows you to change the frame geometry with ease, all to support your riding style. There are two settings, High and Low, and when you “flip the chip,” you effectively change the bottom bracket height by 6mm and the head tube angle by half-a-degree.

IMPROVED CABLE ROUTING

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 housing and it’ll come out the other end. No more lazy loop, hidden stashes of magnets, pokey spokes, or pillows to cry in.

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