Specialized Stumpjumper ST Alloy 29er Mountain Bike 2019 - Trail Full Suspension MTB

Quick and playful, the Specialized Stumpjumper ST is a brand new short travel trail bike that features a cutting-edge frame design that is stiffer than ever. Rolling on 29” wheels with 130/120mm of suspension travel this is a fun full suspension bike that is ideal for trail centre loops and cross-country adventures.
Key Features:
- M5 aluminium frame with asymmetric frame design for improved stiffness
- 120mm of rear wheel travel controlled by a X-fusion O2 shock
- RockShox Recon RL fork offers 130mm of bump soaking suspension travel
- Shimano SLX 1x11 speed drivetrain for intuitive gear shifting and a wide gear range
- Tektro hydraulic disc brakes for all-weather stopping power
- Sizes: Small, Medium, Large, X Large
- Colour: Gloss/East Sierras/Red, Black/Blue
- The Specialized Stumpjumper ST Alloy is available with 0% APR finance
All of you die-hard alloy fans can rejoice. Yes, the new Stumpjumper ST comes in an alloy version, and it may be the most radically designed alloy bike ever made. And with new tube shapes and an asymmetrical design, the Stumpjumper ST Alloy 29 is sure to exceed your expectations of how a trail bike should ride.
Our design goal for the new Stumpjumper was simple—build the ultimate trail bike, one that feels telepathic. And it turns out that this feeling all comes down to stiffness. Think of it this way: when the frame's telling your hands one thing and your feet another, your brain gets confused with the imbalance and the bike feels unstable. In order to fix this, we had to get to work on dialling-in the materials and shapes.
We continued down the suspension path with a custom Rx Trail Tune on both the fork and rear shock. Suspension performance is highly dependent on frame, wheel, and rider size, so we use our Rx Tune to get each bike to land in the middle of the adjustment spectrum, and this gives you the biggest possible range to fine-tune your ride. Another focal point of the tune was matching the suspension characteristics between wheel sizes—we developed a specific Rx Tune for each platform. So, no matter what wheel size you prefer, you'll get perfectly linear suspension.
Steps were also taken to make this bike easy to live with. Threaded bottom brackets make a triumphant return, and we made room for up to a 3.0" tire. You're also free to run whatever aftermarket rear shock you want, since we're using standard metric shocks. And customization is furthered with a Flip Chip that lets you to dial-in your Stumpy to your riding style. Switch it from High to Low and it drops your bottom bracket 6mm and slackens the head tube by half-a-degree. Little details also jump out to surprise you, like a newly designed ribbed chainstay protector that makes chain slap a thing of the past and nearly silences the drivetrain.
All Tredz bikes are:
- Fully built & ready to ride
- Fully checked & tested by Cytech qualified mechanics
- Available with 0% APR finance on baskets over £99
- 365 day no hassle returns
- Free delivery in the UK Mainland on a date that suits you
In the box with every Tredz bike is:
- Free Tredz 9 key trail tool
- Free Tredz pedal spanner
- Free basic pedals
- Tredz drawstring kit bag
- 16 point quality control check sheet
- Basic bike setup instructions
- Free Cycle Plan insurance voucher (8 weeks)
Occasionally, without notice, manufacturers change product design and/or specifications.
| 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, 120mm of travel |
| Fork | RockShox Recon RL, Solo Air, 51mm offset, rebound adjust, lockout, 15x110mm Boost™ Maxle® Lite thru-axle, 130mm of travel |
| Rear Shock | X-Fusion 02 Pro RL, Rx Trail Tune, rebound adjust, lockout 190x42.5mm |
| Stem | Specialized, 3D forged alloy, 4-bolt, 7-degree rise |
| Bars | Specialized, 6061 alloy, 6-degree upsweep, 8-degree backsweep, 27mm rise, 780mm width |
| Front Brake | Tektro Gemini Comp, hydraulic disc, resin pad, 200mm rotor |
| Rear Brake | Tektro Gemini Comp, hydraulic disc, resin pad, 180mm rotor |
| Rear Mech | Shimano SLX, Shadow Plus, GS cage |
| Shifters | Shimano SLX |
| Speed | 11 |
| Rims | Double-wall, 27mm internal width, 32H |
| Front Hub | Specialized, sealed cartridge bearings, 15x110mm spacing, 32h |
| Rear Hub | Specialized, sealed cartridge bearings, 12x148mm thru-axle, 32h |
| Spokes | Stainless, 14g |
| Front Tyre | Butcher, GRID Casing, GRIPTON® compound, 2Bliss Ready, 29x2.3" |
| Rear Tyre | Purgatory, GRID casing, GRIPTON® compound, 2Bliss Ready, 29x2.3" |
| Seat Post | Alloy, two-bolt clamp, 34.9mm |
| Chainset | SRAM NX, Boost™, direct-mount XSYNC, Powerspline, 30T |
| Bottom Bracket | SRAM Power Spline |
| Chain | KMC X11, 11-speed w/ Missing Link™ |
| Cassette | Sunrace, ED Black, 11-speed, 11-46t |
| Pedals | Specialized Dirt |
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