Ever had a ride that felt more like an experience than just a ride? Us, too, and we've been chasing that feeling ever since. With the Stumpjumper Expert 27.5, we've bottled up that feeling and put into a radical new frame design that's so agile, lively, and in-tune with the trail, the bike feels like an extension of your body. Seriously, it's going to make you rethink how a trail bike should ride.
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.
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
- The Stumpjumper's asymmetrical, FACT 11m carbon fiber construction is lightweight, stiff, and ready to take on the trail. It's built off our 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.
- With three different compression adjustments—open/pedal/lock—incredible damping performance, and our Rx Trail Tune, the RockShox Deluxe RT3 perfectly complements the Stumpjumper.
- RockShox's Pike is known for its trail performance, and the RC found here has stiff stanchions, a Charger damper, and plenty of sensitivity.
FACT 11m 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
RockShox Pike RC, DebonAir, rebound/low-speed compression adjust, tapered steerer, 46mm offset, 15mm Maxle® Stealth thru-axle, 15x110mm Boost™, 150mm of travel
RockShox Deluxe RT3, Rx Trail Tune, rebound & 3-position compression adjust, 210x52.5mm
|FRONT HUB||Specialized, sealed cartridge bearings, 15x110mm spacing, 28h|
|REAR HUB||Specialized, sealed cartridge bearings, 12x148mm thru-axle, 28h|
|SPOKES||DT Swiss Industry|
|RIMS||Roval Traverse Carbon 27.5, hookless carbon, 30mm inner width, hand-built, tubeless ready, 28h|
|INNER TUBES||Presta, 40mm valve|
|FRONT TIRE||Butcher, GRID casing, GRIPTON® compound, 2Bliss Ready, 27.5 x 2.6"|
|REAR TIRE||Purgatory, GRID casing, GRIPTON® compound, 2Bliss Ready, 27.5 x 2.6"|
|CRANKSET||Truvativ Descendant, aluminum, Boost™ 148, 170mm crankarm, 24mm spindle|
|BOTTOM BRACKET||SRAM GXP|
|SHIFT LEVERS||SRAM GX Eagle, trigger, 12-speed|
|REAR DERAILLEUR||SRAM GX Eagle, 12-speed|
|CASSETTE||SRAM GX Eagle, 12-speed, 10-50t|
|CHAIN||SRAM GX Eagle, 12-speed|
|FRONT BRAKE||SRAM Guide R, hydraulic disc, organic pads, Guide S4 4-piston caliper, 200mm|
|REAR BRAKE||SRAM Guide R, hydraulic disc, organic pads, Guide S4 4-piston caliper, 180mm|
Specialized Trail, 7050 alloy, 8-degree backsweep, 6-degree upsweep, 27mm rise, 780mm, 31.8mm clamp
|GRIPS||Specialized Sip grip, half-waffle, S/M: regular thickness, L/XL: XL thickness|
|STEM||Specialized Trail, forged alloy, 4-bolt, 5mm rise|
|SADDLE||Body Geometry Phenom Comp, hollow Cr-Mo rails, 143mm|
Command Post IRcc, 16-position micro-height adjustable, two-bolt head, bottom mount cable routing, remote SRL lever, 34.9mm, S: 130mm, M/L/XL: 160mm of travel
|SEAT BINDER||Specialized bolt-type, alloy, 38.6mm|