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Specialized Stumpjumper ST Alloy 29 Mountain Bike

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

£1,899

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Product Information

Specialized Stumpjumper ST Alloy 29 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 short-travel 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

FEATURES

TECHNOLOGIES

The ultimate trail bike 

The innovative sidearm frame design makes a lighter, better-handling bike. By directly connecting all three mounting points of the rear-end and shock to the frame, Specialized has increased both stiffness and performance over bumps. End result? Total control.

 

Perfectly-balanced suspension

Specialized's in-house suspension-tuning team develops custom shock tunes, perfectly paired to each bike’s kinematics. Specialized call this Rx Tune and while it’s not the easy way to build a suspension bike, it’s worth it. You feel Rx Tune as perfectly-balanced suspension.

 

Smart part picks

  • 29er wheels roll over obstacles and maintain your momentum with ease.
  • 130-millimetres of suspension courtesy of a RockShox Recon RL fork.
  • SX Eagle 12-speed drivetrain gives you single-ring simplicity and gearing to spare.

FULL SPECIFICATION

Frameset

Frame - M5 alloy chassis and rear-end, an asymmetrical design, 29 Trail Geometry, threaded BB, fully enclosed internal cable routing, 12x148mm dropouts, sealed cartridge bearing pivots, replaceable derailleur hanger, 120mm of travel

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

 

Suspension

Fork - RockShox Recon RL, Motion Control damper with low-speed compression to lockout, 51mm offset, rebound adjust, 15x110mm Boost™ Maxle® Lite thru-axle, 130mm of travel

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

 

Drivetrain

Chain - SRAM SX Eagle, Powerspline, 170mm

Bottom Bracket - SRAM Powerspline

Crankset - SRAM SX Eagle, Powerspline, 170mm

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

Cassette - SRAM PG-1210 Eagle, 11-50t

Chainrings - Steel, 32T

Rear Derailleur - SRAM SX Eagle

 

Wheels

Front Hub -  Specialized, sealed cartridge bearings, 15x110mm thru-axle, 32h

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

Spokes - Stainless, 14g

Rims - Double-wall alloy, 27mm internal width

Front Tyre - Eliminator, GRID TRAIL casing, GRIPTON® compound, 2Bliss Ready, 29x2.3"

Rear Tyre - Purgatory, GRID Casing, 2Bliss Ready, 29x2.3"

 

Brakeset

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

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

 

Cockpit

Saddle - Body Geometry Myth -155 XS/S, Body Geometry Henge:143 M/L/XL, steel rails 

Seatpost - TransX dropper, 34.9mm, XS: 100mm, S: 125mm, ML/XL: 150mm Travel

Stem - Specialized, 3D-forged alloy, 4-bolt, 7-degree rise

Handlebars - Specialized Trail, 6061 alloy, 8-degree backsweep, 6-degree upsweep, 27mm rise, 780mm, 31.8mm clamp

Grips - Specialized Sip Grip, half-waffle, slip-on