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Specialized Stumpjumper ST Alloy 27.5 Mountain Bike

  • The Stumpjumper is back in a snappy, nimble & versatile short-travel design for a playful feel
  • 130mm of travel at the front and back of the frame keeps the trail fast and comfortable
  • Single 32T front ring combined with a 11-50T 12-speed cassette gives you plenty of gear range
  • TranzX dropper seatpost enables you to adapt to the trail for better handling round fast bends
Specialized

£1,899

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Product Information

Specialized Stumpjumper ST Alloy 27.5 Mountain Bike

The Stumpjumper ST Alloy 27.5 is back and better than ever. This model brings snappy and nimble movements to a whole new dimension whilst maintaining a versatile feel to keep your comfort optimised throughout your trail journey, great for any rider looking for efficiency combined with capability. When riding, you have total control thanks to the innovative sidearm frame design, allowing you to experience lighter and better-handling whilst on the go. By using Specialized's SX Eagle 12-speed drivetrain, you experience single-ring simplicity with an 11-50T cassette, giving you the gearing you need to conquer the biggest climbs. The Stumpjumper is perfect for any rider looking to have fast and agile handling with the addition of the TranzX dropper seatpost to increase your manoeuvrability. So get ready to rip up the trail with a bike that's ready to rumble. 

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 increased both stiffness and performance over bumps, giving you total control.

 

Perfectly-balanced suspension

Specialized's in-house suspension-tuning team develops custom shock tunes, perfectly paired to each bike's kinematics. Specialize 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 parts pick

27.5 wheels accentuate the Stumpjumper ST's playful on-trail feel. Also designed with 130-millimeters of suspension, courtesy of a RockShox Recon RL fork. Finally, SX Eagle 12-speed drivetrain gives you single-ring simplicity and gearing to spare.

 

FULL SPECIFICATION

Frameset

Frame - M5 alloy chassis and rear-end, asymmetrical design, 27.5 Trail Geometry, threaded BB, fully enclosed internal cable routing, 12x148mm dropouts, sealed cartridge bearing pivots, replaceable derailleur hanger, 130mm of travel

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

 

Suspension

Fork - RockShox Recon RL, Motion Control damper with low-speed compression to lockout, 46mm 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 190x45mm

 

Drivetrain

Chain - SRAM SX Eagle, 12-speed

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 - Purgatory, GRID casing, GRIPTON® compound, 2Bliss Ready, 27.5 x 2.3"

Rear Tyre - Purgatory, GRID casing, GRIPTON® compound, 2Bliss ready, 27.5x2.3"

 

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

 

Brakes

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

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