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Specialized Stumpjumper Alloy Mountain Bike 2021

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Stumpjumper Alloy Mountain Bike 2021
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Product ID: 1320591

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Specialized Stumpjumper Alloy Mountain Bike

Lightweight and durable, the Specialized Stumpjumper Alloy Mountain Bike offers an entry-level price without entry-level performance. This no-nonsense model provides progressive geometry with refreshed suspension kinematics to make it the best performing Stumpjumper yet. Designed to perform on a wide range of trails, the Stumpjumper Alloy features a lightweight frame design that does not sacrifice stiffness. With a light and lively ride character, the new Stumpjumper aims to elevate your riding to new heights, whether you are a seasoned veteran, or taking your first steps in the sport.

With 130mm of trail-hungry travel, the Stumpjumper alloy hits the sweet-spot for riders looking to boost their trail-centre game. The product of thousands of lab and field testing hours, Specialized have made this latest revision into the fastest so far. Short on travel but not short on fun, the Stumpjumper packs a punch when it comes to explosive climbing performance, with improved pedalling characteristics meaning you will leave your friends for dust on the way to the trailhead. What goes up must come down, the latest changes are keen to take on any challenge, ensuring you never feel out of pocket when it is time to descend.

SRAM’s SX drivetrain offers 12-speed performance on a budget, with trickle-down technology seeing high-end features found on the GX and NX lines filtering down. A truly contemporary ride, the Stumpjumper Alloy features a TransX dropper post to retain flow on mixed gradient trails and RockShox’s 35 Silver fork provides stout tracking and a silky smooth 140mm of travel. 29" wheels with sealed cartridge bearings offer excellent rolling capabilities on rough terrain, reducing hang up through ruts and bumps.


  • 29" aluminium frameset with asymmetrical design
  • Redesigned suspension kinematics for improved on-trail performance
  • Horst pivot BB adjustment
  • 130mm of trail-hungry travel
  • RockShox 35 Silver fork and X-Fusion O2 rear shock with lockout
  • SRAM SX 12-speed groupset with Tektro Gemini brakes
  • Rider-First Engineered™ sizing

Technical Specification

Frame Specialized 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
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
Bottom Bracket SRAM Powerspline
Stem Specialized Alloy Trail Stem, 35mm bar bore
Handlebar Specialized, 6061 alloy, 6-degree upsweep, 8-degree backsweep, 30mm rise, 800mm width
Grips Specialized Trail Grips
Front Brake Tektro Gemini Comp, hydraulic disc, resin pad, 200mm
Rear Brake Tektro Gemini Comp, hydraulic disc, resin pad, 180mm
Brake Levers Tektro Gemini Comp
Rear Derailleur SRAM SX Eagle, 12-speed
Shift Levers SRAM SX Eagle, trigger, 12-speed
Chain SRAM SX Eagle, 12-speed
Cassette SRAM PG-1210 Eagle, 11-50t
Crankset SRAM SX Eagle, 30t
Front Wheel Rim - Specialized 700c disc, double-wall alloy, sleeved, 32h / Hub - Alloy, sealed cartridge bearings, 15x110mm thru-axle, 28h
Rear Wheel Rim - Specialized 700c disc, double-wall alloy, sleeved, 32h / Hub - Alloy, sealed cartridge bearings, 12x148mm thru-axle, 28h
Front Tyre Specialized Butcher, GRID TRAIL casing, GRIPTON® compound, 29x2.3”, tubeless-ready, folding
Rear Tyre Specialized Purgatory, GRID Casing, GRIPTON® compound, 29x2.3", tubeless-ready, folding
Saddle Specialized Bridge, 155/143mm, Hollow Cr-Mo rails
Seatpost TranzX dropper, 34.9mm
Pedals Available to be purchased separately

Built, Checked, Tuned and Tested

All our bikes are fully built, checked, tuned and tested by our Cytech qualified mechanics and then securely packaged, ready for delivery. All you have to do is add the pedals (if included), attach the handlebars to the stem and tighten them following the included detailed instructions or by watching our video and using the provided FREE tools. Visit our Bike Assembly page to see how you assemble your new bike once you receive it.

All bikes collected from our shop, are built, tested and ready to ride.

Please note, occasionally, manufacturers may change the specification without notice. Bicycles do not come with pedals unless otherwise specified. Bikes ordered for delivery will not arrive with the pedals installed, please refer to the owners manual and pedal installation guides provided for guidance or contact Customer Care. We do not install accessories to bikes, including mudguards.

Specialized Stumpjumper Alloy Mountain Bike 2021 Sizing

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