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Specialized Stumpjumper Alloy Mountain Bike

  • Made to be nimble, snappy & a whole lot of fun, the Stumpjumper is designed ready for the trail
  • 1x12 speed groupset with 50T cassette provides plenty of range without front derailleur hassle
  • 29" wheels enhance & maintain momentum by easily overcoming obstacles, creating a smoother ride
  • TranzX seatpost puts you in control of your position when it comes to handling tricky descents




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Product Information

Specialized Stumpjumper Alloy Mountain Bike

The world's first mountain bike is continuing to develop at the fast rate that helped it to take its first steps. The Stumpjumper cultivates years of engineering to provide a fast, fun and comfortable feel on the trail. In its latest design, the Stumpjumper becomes even nippier promising to pump you full of adrenaline. 29" wheels help to maintain your hard-earned momentum by decreasing the angle of attack between you and the surface of the trail, meaning your ride is not only faster but more comfortable. The TranzX dropper seatpost puts you in control of your position for high-speed descents that require constant adaption. Finally, SRAM's 1x12 speed groupset, with a 50T cassette, provides plenty of gear range without the hassle of a front derailleur, meaning you can spend even more time on the trail rather than sorting your bike out. 

Full Specification



The Trail Benchmark

When Specialized set out to design the all-new Stumpjumper, they pursued some hefty goals. It had to excel on any kind of trail, for every style of rider. To achieve that, Specialized went after serious weight reduction without sacrificing durability, a stiff, responsive chassis that still rides light and lively, geometry that improves everyone’s riding, and the best suspension kinematics Specialized know how to design. Turns out, you can have your cake and eat it too with the new Stumpjumper.


The Technology

The Stumpjumper Alloy brings all-new suspension kinematics and progressive geometry into a full-alloy package that's both lightweight and extremely durable. Outfitted with a no-fuss SRAM SX 12-speed groupset, the Stumpjumper Alloy is your all-access pass for trail adventure. Specialized massaged the kinematics of the Stumpjumper suspension to bring out the very best all-round performance possible in a 130mm package. Countless hours of suspension lab development and field testing created a refined mid-travel ripper that eats big terrain like a gravity fed beast, handles like a dream everywhere, and climbs like it has a motor.


Progressive Geometry

The S-Sizing geometry of the new Stumpjumper hits the progressive sweet spot. It’s long, low and slack, with a short offset fork and a steeper seat tube angle. These numbers combine to make your ride more stable, more carvealicious, more comfortable climbing, more better everywhere. With FlipChip adjustability you’re able to further fine-tune your fit, ensuring that your new Stumpjumper performs flawlessly on whatever terrain you choose. Rider-First Engineered™ frames use a size-specific approach to ride characteristics that ensure benchmark handling and flawless performance, regardless of frame or rider size. Whether you’re a jump-happy grom riding an S1, or a DH-fiend giant in need of the lengthy S6, you’ll experience the same ride traits – rail-sharp cornering and balanced front and rear stiffness – at the lightest-possible weight, And by light, Specialized mean real light: 2,250 grams (S-Works, S-3 size, with rear shock).



Frame - Alloy chassis and rear-end, asymmetrical design, 29 Trail Geometry, horst pivot BB adjustment, threaded BB, 12x148mm dropouts, sealed cartridge bearing pivots, replaceable derailleur hanger, 130mm of travel

Seat Binder - Specialized bolt-type, alloy, 38.6mm



Fork - RockShox 35 Silver, Solo Air, 44mm offset, rebound adjust, TurnKey lockout, 15x110mm Boost™ Maxle® Lite thru-axle, 140mm of travel

Rear Shock - X-Fusion 02 Pro RL, Rx Trail Tune, rebound adjust, lockout S1:190x42.5mm, S2-S6: 190x45mm



Chain - SRAM SX Eagle, 12-speed

Bottom Bracket - SRAM Powerspline

Crankset - SRAM SX Eagle, DUB, S1:165mm, S2-S5: 170mm, S6: 175mm

Shift Levers - SRAM SX Eagle, trigger, 12-speed

Cassette - SRAM PG-1210 Eagle, 11-50t

Chainrings Steel, 30T

Rear Derailleur - SRAM SX Eagle, 12-speed



Front Hub Alloy, sealed cartridge bearings, 15x110mm thru-axle, 28h

Rear Hub - Alloy, sealed cartridge bearings, 12x148mm thru-axle, 28h

Spokes Stainless, 14g

Rims - 700c disc, double-wall alloy, sleeved, 32h

Front Tyre - Butcher, GRID casing, GRIPTON® compound, 29x2.3"

Rear Tyre - Purgatory, GRID Casing, GRIPTON® compound, 29x2.3"

Inner Tubes - Standard, Presta valve



Front Brake - Tektro Gemini Comp, hydraulic disc, resin pad, 200mm

Rear Brake Tektro Gemini Comp, hydraulic disc, resin pad, 180mm



Saddle - Body Geometry Bridge Saddle, steel rails

Seatpost - TranzX dropper, 34.9mm, XS-S: 100mm, M: 120mm, L/XL: 150mm Travel

Stem - Alloy Trail Stem, 35mm bar bore

Handlebars Specialized, 6061 alloy, 6-degree upsweep, 8-degree backsweep, 30mm rise, 800mm width