Why buy your bike from Sigma Sports?
Don't hesitate to reach out to us. It's our goal to answer all of your questions and offer the best advice from our experts. We’ll be happy to answer any questions you may have. Contact us now or visit us in-store.
All our bikes are fully built by our Cytech qualified mechanics. To find out more, see the Built, Checked, Tuned and Tested section below to see how we'll deliver your bike.
We offer FREE DELIVERY of your bike to your home or place of work. Once you've placed your order, our Customer Care team will be in contact to offer a convenient delivery date of your choice.
We've partnered with PedalSure to offer you 30-DAYS FREE bike insurance on new bikes over £400. Visit our Cycle Insurance page to learn more and claim.
Specialized Stumpjumper Comp Alloy Mountain Bike
The Specialized Stumpjumper Comp Alloy Mountain Bike strikes the perfect balance between performance and value, and is designed to take your riding experience to the next level. An ideal partner for long days on the hill, the new Stumpjumper offers a lively, snappy ride, that begs to be thrown around corners and to catch air on side-hits. Weight reduction was a key focus with this refreshed design, with advanced aluminium technology allowing for a lightweight frame without sacrificing durability or stiffness.
Instilling a feeling of total balance, 130mm of well-optimised suspension hits the sweet-spot for trail riding. Rarely feeling under or over-biked, the Stumpjumper Comp Alloy offers impressive climbing and descending characteristics, ideal for the modern mountain biker. Whether razzing trails down your local woods or on a multi-day Welsh epic, RX Tuned suspension and generous geometry keep things stable in the rough. A steep seat tube optimises climbing capabilities, increasing power output with a comfortable riding position.
Revised suspension kinematics balance a playful ride with improved big-hit performance. A highly progressive leverage rate ensures a bottomless suspension feel that uses all 130mm of travel on offer, with impressive impact management preventing harsh bottom-outs. Handling much like a bike with more travel the Stumpjumper truly performs on the descents, without impacting on its excellent climbing characteristics. A yoke mounted flip-chip allows for trailside geometry adjustment, providing half a degree of head angle adjustment to fine-tune your ride.
The 12-speed SRAM NX groupset offers a wide gear range for steep climbs, allowing you to keep the cranks turning no matter the gradient. SRAM also take care of braking duties, with the four-piston G2 R hydraulic disc brakes offering ample stopping power on heart-stopping descents. The 29" specific platform is kept rolling with tough Roval sealed bearing wheels, and an X-Fusion Manic dropper seatpost provides total flow on undulating trails.
- 29" aluminium frameset with asymmetrical design
- Redesigned suspension kinematics for improved on-trail performance
- Shock-mounted flip-chip for geometry adjustment
- 130mm of trail-hungry travel
- FOX FLOAT 34 Rhythm fork and FOX FLOAT DPS Performance rear with custom RX Trail Tune
- SRAM NX 12-speed groupset with SRAM G2 R hydraulic brakes
- Rider-First Engineered™ sizing
|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||FOX FLOAT 34 Rhythm, GRIP damper, two-position Sweep adjustment, 15x110mm QR axle, 44mm offset,140mm of travel|
|Rear Shock||FOX FLOAT DPS Performance, Rx Trail Tune, rebound and 3-position compression adjust, S1 - 190x42.5mm, S2-S6 - 190x45mm|
|Bottom Bracket||SRAM DUB, BSA 73mm, Threaded|
|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||SRAM G2 R, four-piston calliper, hydraulic disc, 200mm|
|Rear Brake||SRAM G2 R, four-piston calliper, hydraulic disc, 180mm|
|Brake Levers||SRAM G2 R|
|Rear Derailleur||SRAM NX Eagle, 12-speed|
|Shift Levers||SRAM NX Eagle, trigger, 12-speed|
|Chain||SRAM NX Eagle, 12-speed|
|Cassette||SRAM NX Eagle, 11-50t|
|Crankset||SRAM NX Eagle, 30t|
|Front Wheel||Rim - Roval 29, hookless alloy, 30mm inner width, tubeless-ready / Hub - Alloy, sealed cartridge bearings, 15x110mm thru-axle, 28h|
|Rear Wheel||Rim - Roval 29, hookless alloy, 30mm inner width, tubeless-ready / 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 Comp, Hollow Cr-mo rails, 155/143mm|
|Seatpost||X-Fusion Manic, infinite adjustable, remote SRL LE lever, 34.9 (S1 - 100mm, S2 - 125mm, S3 - 150mm, S4/S5 - 170mm, S6 - 190mm)|
|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 specified), 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. We do not install accessories to bikes, including mudguards.
Specialized Stumpjumper Comp Alloy Mountain Bike 2021 Sizing
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