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Men's Stumpjumper Expert 27.5

2019 Men's Stumpjumper Expert 27.5

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.

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.

For the build, you get a solid components package with a full SRAM GX1 Eagle drivetrain, SRAM Guide R disc brakes, RockShox front and rear suspension (150/150mm of travel respectively), and Roval Traverse Carbon 27.5 wheels.

Especificaciones técnicas

FRAMESET

FRAME

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

SUSPENSION

REAR SHOCK

RockShox Deluxe RT3, Rx Trail Tune, rebound & 3-position compression adjust, 210x52.5mm

FORK

RockShox Pike RC, DebonAir, rebound/low-speed compression adjust, tapered steerer, 46mm offset, 15mm Maxle® Stealth thru-axle, 15x110mm Boost™, 150mm of travel

COCKPIT

HANDLEBARS

Specialized Trail, 7050 alloy, 8-degree backsweep, 6-degree upsweep, 27mm rise, 780mm, 31.8mm clamp

STEM

Specialized Trail, forged alloy, 4-bolt, 5mm rise, 40mm

GRIPS

Specialized Sip grip, half-waffle, S/M: regular thickness, L/XL: XL thickness

SADDLE

Body Geometry Phenom Comp, hollow Cr-Mo rails, 143mm

SEATPOST

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

BRAKES

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

DRIVETRAIN

SHIFT LEVERS

SRAM GX Eagle, trigger, 12-speed

REAR DERAILLEUR

SRAM GX Eagle, 12-speed

CASSETTE

SRAM GX Eagle, 12-speed, 10-50t

CRANKSET

Truvativ Descendant, aluminum, Boost™ 148, 170mm crankarm, 24mm spindle

CHAINRINGS

32T

CHAIN

SRAM GX Eagle, 12-speed

BOTTOM BRACKET

SRAM GXP

WHEELS & TIRES

RIMS

Roval Traverse Carbon 27.5, hookless carbon, 30mm inner width, hand-built, tubeless ready, 28h

FRONT HUB

Specialized, sealed cartridge bearings, 15x110mm spacing, 28h

REAR HUB

Specialized, sealed cartridge bearings, 12x148mm thru-axle, 28h

SPOKES

DT Swiss Industry

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"

INNER TUBES

Presta, 40mm valve

ACCESSORIES

PEDALS

Specialized Dirt

* Pesos basados en cuadros pintados de producción como se muestra en la imagen. Los pesos reales variarán en función del color, tamaño del cuadro y variación de componentes. Las especificaciones están sujetas a cambios sin previo aviso.

Geometría

SMLXL
Largo de biela170MM170MM170MM170MM
Ancho de manubrio780mm780mm780mm780mm
Largo de avance40MM40MM50MM50MM
Saddle Width143mm143mm143mm143mm
Largo de poste de asiento369mm429mm429mm429mm
Stack592mm596mm623mm637mm
Alcance415mm435mm455mm480mm
Largo de tubo de dirección105mm110mm140mm155mm
Ángulo de tubo de dirección65.5°65.5°65.5°65.5°
BB Height336mm336mm336mm336mm
BB Drop21mm21mm21mm21mm
Trail112mm112mm112mm112mm
Fork Length, Full542mm542mm542mm542mm
Fork Rake/Offset46mm46mm46mm46mm
Distancia726mm748mm780mm812mm
Largo de vaina inferior432mm432mm432mm432mm
Distancia entre ejes1157mm1179mm1212mm1243mm
Largo de tubo superior, Horizontal570mm595mm627mm660mm
Bike Standover Height739mm743mm758mm774mm
Seat Tube Length380mm410mm455mm505mm
Ángulo de tubo de asiento75.3°75°74.6°74.2°
Geometría

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