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.
Save up to 47% with any one of our 11 Cycle to Work partners, and get the health benefits of a new bike in exchange for tax free salary sacrifice. To find out more about our various partners and how to apply click here.
Choose between Free Bike Delivery - to your home or place of work - or our new Premier Bike Delivery Service £99.99 and have your bike delivered "ready to ride" and set up to your measurements with seatpost and pedals adjusted on arrival by a qualified bike mechanic. Either way, our Customer Care team will be in touch to arrange a delivery date to suit you.
We've partnered with Laka to offer you 30 days free bike Insurance on your new bike purchase over £400. Click here for more info and find out how to claim.
Specialized Stumpjumper ST Alloy 27.5 Mountain Bike 2020
The ST Alloy 27.5 Mountain Bike is part of Specialized's Stumpjumper range, which has long been their all-purpose trail bike, offering exceptional performance for the cost and the ability to not feel outclassed on any terrain. This is exemplified by this 27.5” version that features an M5 alloy Boost frame with an X-Fusion 02 Pro RL shock and a RockShox Recon RL fork, both with 130mm of travel. SRAM’s 12-speed SX Eagle groupset and the Tektro Gemini Comp hydraulic disc brakes punch well above their weight in terms of function and feel whilst the inclusion of the TransX dropper seatpost is a real boon in enabling greater confidence and control on tricky trails.
Features
- Specialized M5 alloy chassis with 130mm travel
- RockShox Recon RL with 130mm travel
- Tektro Gemini Comp hydraulic disc brakes
- TransX dropper seatpost
- SRAM SX Eagle, 12-speed drivetrain
Technical Specification
| FRAME | Specialized 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 |
| 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 190x45mm |
| STEM | Specialized, 3D-forged alloy, 4-bolt, 7-degree rise |
| HANDLEBAR | Specialized Trail, 6061 alloy, 8-degree backsweep, 6-degree upsweep, 27mm rise, 780mm, 31.8mm clamp |
| GRIPS | Specialized Sip Grip, half-waffle, slip-on |
| FRONT BRAKE | Tektro Gemini Comp, hydraulic disc, resin pad, 200mm rotor |
| REAR BRAKE | Tektro Gemini Comp, hydraulic disc, resin pad, 180mm rotor |
| BRAKE LEVERS | Tektro Gemini Comp |
| FRONT DERAILLEUR | N/A |
| REAR DERAILLEUR | SRAM SX Eagle, 12-speed |
| SHIFT LEVERS | SRAM SX Eagle, trigger, 12-speed |
| CASSETTE | SRAM PG-1210 Eagle, 12-speed 11-50t |
| CRANKSET | SRAM SX Eagle, Powerspline 32t |
| CHAIN | SRAM SX Eagle, 12-speed |
| FRONT WHEEL | Specialized, sealed cartridge bearings, 15x110mm spacing, 32h hub with DT Swiss Industry spokes and alloy 27.5”, hookless alloy, 27mm inner width, tubeless-ready rim |
| REAR WHEEL | Specialized, sealed cartridge bearings, 12x148mm spacing, 32h hub with DT Swiss Industry spokes and alloy 27.5”, hookless alloy, 27mm inner width, tubeless-ready rim |
| FRONT TYRE | Specialized Eliminator, GRID TRAIL casing, GRIPTON® compound, 2Bliss Ready, 27.5x2.3" clincher |
| REAR TYRE | Specialized Eliminator, GRID casing, 2Bliss Ready, 27.5x2.3" clincher |
| SADDLE | Specialized Body Geometry Myth 155 S, Body Geometry Henge 143 M/L/XL, steel rails |
| SEATPOST | TransX dropper, 34.9mm, S |
| PEDALS | Specialized Dirt |
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. For hassle-free home delivery and bike set-up from a qualified mechanic use our Premier Delivery Service.
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. We do not install accessories to bikes, including mudguards. Bikes ordered for delivery that have tubeless compatible tyres and rims will arrive with inner tubes installed or with tubeless valves installed, this will be brand dependent. Sealant is available to be purchased separately.
If you require any assistance please contact our Customer Care team.
Unable to display Reviews due to Privacy Settings.
Adjust your Cookie Preferences to Opt-in "YES" to "Functional Cookies".
Unable to display Q&A due to Privacy Settings.
Adjust your Cookie Preferences to Opt-in "YES" to "Functional Cookies".