Ex-Demo: 2019 Specialized Stumpjumper Comp Carbon 27.5 MTN Bike Medium

As this is not a brand new bike, it may not feature the full original technical specification and is subject to change.

S-Works doesn't get to have all the fun; the new Stumpjumper Comp Carbon features powerful components to give you the most excitement on the trails.

It features the same nimble handling and frame with a full 11m carbon chassis and rear-end as its older brother, but with a solid list of no-fuss components for an everyman's budget. The 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 frame's 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.

Specialized started by creating our own mountain-specific stiffness test, and then looked at the layout with Finite Element Analysis (FEA) to see where the biggest stiffness improvements could be made. 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. Specialized 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, a radical new sidearm design was developed. 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 minimises frame flex when the rear suspension is active.

Specialized 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 Rx Tune is used 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 - a specific Rx Tune was developed 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, room was made for up to a 3.0" tyre. You're also free to run whatever aftermarket rear shock you want, since they're using standard metric shocks. The SWAT™ box was also revamped, making it sleeker, lighter, and with more volume. Customisation 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, Specialized 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.

The build on this Comp model comes with a list of components that deliver undeniable quality, like a Shimano SLX drivetrain with RaceFace cranks, Shimano SLX disc brakes, FOX front and rear suspension, and Roval Traverse 27.5 wheels.

• The Stumpjumper's asymmetrical, FACT 11m carbon fibre construction is lightweight, stiff, and ready to take on the trail. It's built off 27.5 Trail Geometry, so it's 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, it's ready for anything the trail, or you, throw at it.
• The FOX DPS Performance rear shock features Rx Trail Tune, ensuring that no matter the wheel or frame size, your bike is dialed-in perfectly.
• A FOX 34 Rhythm fork handles suspension duties up front, with stiff stanchions and plenty of adjustability.