Don't worry, S-Works doesn't get to have all of the fun—the new Stumpjumper Comp Carbon 27.5 features the same frame with a full 11m carbon chassis and rear-end as its older brother, but with a solid list of no-fuss components, including a SRAM NX Eagle 12-speed groupset, for an everyman's budget.
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 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.
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 2.8" tire. You're also free to run whatever aftermarket rear shock you want, since we're 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.
The build on this Comp model comes with a list of components that deliver undeniable quality, like a 12-speed SRAM NX Eagle drivetrain, SRAM Guide R disc brakes, FOX front and rear suspension, and Roval Traverse 27.5 wheels.
•Bottom Bracket: SRAM DUB, threaded BB
•Cassette: SRAM NX Eagle, 12-speed, 11-50t
•Chain: SRAM NX Eagle, 12-speed
•Chainrings: Steel, 32T
•Crankset: SRAM NX Eagle, DUB, 170mm
•Fork: FOX FLOAT Rhythm, 34, GRIP Damper, 44mm offset, 2-position sweep adjust, 15x110mm, tapered alloy steerer, 150mm of travel
•Frame: FACT 11m, full carbon chassis and rear-end, asymmetrical design, 27.5 Trail Geometry, SWAT™ Door integration, threaded BB, fully enclosed internal cable routing, 12x148mm dropouts, sealed cartridge bearing pivots, replaceable derailleur hanger, 150mm of travel
•Front Brake: SRAM Guide R, hydraulic disc, organic pads, Guide S4 4-piston caliper, 200mm
•Front Hub: Specialized, sealed cartridge bearings, 15x110mm spacing, 28h
•Front Tire: Butcher, GRID casing, GRIPTON® compound, 2Bliss Ready, 27.5 x 2.6"
•Grips: Specialized Sip grip, half-waffle, S/M: regular thickness, L/XL: XL thickness
•Handlebars: Specialized Trail, 6061 alloy, 8-degree backsweep, 6-degree upsweep, 27mm rise, 780mm, 31.8mm clamp
•Inner Tubes: Presta, 40mm valve
•Pedals: Specialized Dirt
•Rear Brake: SRAM Guide R, hydraulic disc, organic pads, Guide S4 4-piston caliper, 180mm
•Rear Derailleur: SRAM NX Eagle, 12-speed
•Rear Hub: Specialized, sealed cartridge bearings, 12x148mm thru-axle, 28h
•Rear Shock: FOX FLOAT DPS Performance, Rx Trail Tune, rebound and 3-position compression adjust, 210x52.5mm
•Rear Tire: Purgatory, GRID casing, GRIPTON® compound, 2Bliss Ready, 27.5 x 2.6"
•Rims: Roval Traverse 27.5, hookless alloy, 30mm inner width, tubeless ready, 28h
•Saddle: Body Geometry Phenom Comp, hollow Cr-Mo rails, 143mm
•Seat Binder: Specialized bolt-type, alloy, 38.6mm
•Seatpost: X-Fusion Manic, infinite adjustable, two-bolt head, bottom mount cable routing, remote SRL LE lever, 34.9mm, S: 125mm, M/L/XL: 150mm of travel
•Shift Levers: SRAM NX Eagle, trigger, 12-speed
•Spokes: DT Swiss Industry
•Stem: Specialized Trail, 3D-forged alloy, 4-bolt, 6-degree rise