Ever had a ride that felt more like an experience than just a ride? With the Specialized Men's Stumpjumper Expert 29 Disc Mountain Bike, that feeling is bottled up and put it into a radical new frame design that's so 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.
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, Specialized had to get to work on dialing-in the materials, shapes, and the layout.
They started by creating their own mountain-specific stiffness test, and then looked at the layout with Finite Element Analysis (FEA) to see where the biggest stiffness improvements were. 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 was 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 primary goal, Specialized 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.
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 Specialized used their own 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--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, and there's room for up to a 3.0" tire. You're also free to run whatever aftermarket rear shock you want, since it comes with standard metric shocks. The SWAT box has been revamped, 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, the cable routing seriously couldn't be any easier. 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 (150/140mm of travel respectively), and Roval Traverse Carbon 29 wheels.
- The Stumpjumper's asymmetrical, FACT 11m carbon fiber construction is lightweight, stiff, and ready to take on the trail. It's built off 29 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 a 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.
- Frame - FACT 11m, full carbon chassis and rear-end, asymmetrical design, 29 Trail Geometry, SWAT Door integration, threaded BB, fully enclosed internal cable routing, sealed cartridge bearing pivots, replaceable derailleur hanger, 140mm of travel
- Fork - RockShox Pike RC, DebonAir, rebound/low-speed compression adjust, tapered steerer, 51mm offset, 150mm of travel
- Rear Shock - RockShox Deluxe RT3, Rx Trail Tune, rebound & 3-position compression adjust, 210x50mm
- Front Axle - 15x110mm Boost
- Rear Axle - 12x148mm
- Rims/Wheels - Roval Traverse Carbon 29, hookless carbon, 30mm inner width, hand-built, tubeless ready, 28h
- Hubs - Specialized, sealed cartridge bearings, 28h
- Spokes - DT Swiss Industry
- Front Tire - Butcher, GRID casing, GRIPTON compound, 2Bliss Ready, 29x2.6"
- Rear Tire - Purgatory, GRID casing, GRIPTON compound, 2Bliss ready, 29 x2.6"
- Crankset - Truvativ Descendant, aluminum, Boost 148, 170mm crankarm, 24mm spindle
- Chainrings - 30T
- Bottom Bracket - SRAM GXP
- Chain - SRAM GX Eagle, 12-speed
- Rear Derailleur - SRAM GX Eagle, 12-speed
- Cassette/Rear Cogs - SRAM GX Eagle, 12-speed, 10-50t
- Shifters - SRAM GX Eagle, trigger, 12-speed
- Handlebars - Specialized Trail, 7050 alloy, 8-degree backsweep, 6-degree upsweep, 27mm rise, 780mm, 31.8mm clamp
- Tape/Grips - Specialized Sip Grip, half-waffle, S/M: regular thickness, L/XL: XL thickness
- Stem - Specialized Trail, forged alloy, 4-bolt, 5mm rise
- Brakes - SRAM Guide R, hydraulic disc, organic pads, Guide S4 4-piston caliper, 200mm/180mm
- Pedals - Specialized Dirt
- Saddle - Body Geometry Phenom Comp, Adaptive Edge design, hollow Cr-Mo rails, 143mm
- Seat Post - 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