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 29 12 Speed Mountain Bike 2020
The newly redesigned Specialized Stumpjumper Comp Alloy 29 mountain bike with SRAM NX Eagle 12-speed drivetrain will revolutionise your trail riding experience. With the engineering focused on stiffness so that your hands and feet are in sync and the bike responds in a balanced and predictable manner, it delivers an assured ride feel that will inspire confidence when the terrain becomes technical and you need to hit the perfect line.
Depending on frame size, the bike is set up with an optimal Rx Tune (suspension sag value) which dials in the ideal ride characteristics for handling and geometry. Fine tune the customisation of the ride using the innovative Flip Chip that lets you drop the bottom bracket by 6mm and slacken off the head tube by half a degree for more control on descents, and the ribbed chainstay protector virtually eliminates chain slap and silences the drivetrain.
Finishing off the build the bike is equipped with a SRAM NX Eagle 11-50t 12-speed drivetrain and a 30t single front chainring, for spinning up the toughest climbs, and quality FOX front and rear suspension. With space to fit up to a 3-inch tyre, the Roval Traverse 29er wheels will roll over anything in your path.
- SRAM NX Eagle, 12-speed
- New tube shapes and an asymmetrical design deliver improved stiffness, power transfer and ride balance
- The FOX DPS Performance rear shock is set up using the Rx Trail Tune, ensuring that no matter the frame size, your bike is dialed-in perfectly
- Specialized M5 alloy front- and rear-end, an asymmetrical design, and 29 Trail Geometry
- 2Bliss Ready front and rear tyres
|FRAME||M5 alloy chassis and rear end, asymmetrical design, 29 Trail Geometry, threaded BB, fully enclosed internal cable routing, 12x148mm dropouts, sealed cartridge bearing pivots, replaceable derailleur hanger, 140mm of travel|
|FORK||FOX FLOAT Rhythm 34, GRIP Damper, 51mm offset, 2-position sweep adjust, 15x110mm, tapered alloy steerer, 150mm of travel|
|REAR SHOCK||FOX FLOAT DPS Performance, Rx Trail Tune, rebound and 3-position compression adjust, 210x50mm|
|HANDLEBAR||Specialized Trail, 6061 alloy, 8-degree backsweep, 6-degree upsweep, 27mm rise, 780mm, 31.8mm clamp|
|FRONT BRAKE||SRAM Guide R, hydraulic disc, organic pads, Guide S4 4-piston caliper, 200mm|
|REAR BRAKE||SRAM Guide R, hydraulic disc, organic pads, Guide S4 4-piston caliper, 180mm|
|REAR DERAILLEUR||SRAM NX Eagle, 12-speed|
|SHIFT LEVERS||SRAM NX Eagle, trigger, 12-speed|
|CASSETTE||SRAM NX Eagle, 12-speed, 11-50t|
|CHAIN||SRAM NX Eagle, 12-speed|
|CRANKSET||SRAM NX Eagle, DUB, 170mm|
|BOTTOM BRACKET||SRAM DUB, threaded BB|
|RIMS||Roval Traverse 29, hookless alloy, 30mm inner width, tubeless ready|
|FRONT HUB||Specialized, sealed cartridge bearings, 15x110mm spacing, 28h|
|REAR HUB||Specialized, sealed cartridge bearings, 12x148mm thru-axle, 28h|
|FRONT TYRE||Butcher, GRID casing, GRIPTON® compound, 2Bliss Ready, 29x2.6"|
|REAR TYRE||Purgatory, GRID casing, GRIPTON® compound, 2Bliss ready, 29 x2.6"|
|SADDLE||Body Geometry Phenom Comp, Adaptive Edge design, hollow Cr-Mo rails, 143mm|
|SEATPOST||X-Fusion Manic, infinite adjustable, two-bolt head, bottom mount cable routing, remote SRL LE lever, 34.9mm, S|
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 29" 12-Speed Mountain Bike 2020 Sizing
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