The Specialized Stumpjumper Comp Carbon 27.5 12-Speed Mountain Bike 2020 packs the top-level chassis with a trail-ready spec on an everyman’s budget, including 12-speed gearing.
Don’t worry, S-Works doesn’t get to have all of the fun. The new 2020 Specialized Stumpjumper Comp Carbon 27.5 features the same frame with a full 11m carbon chassis and rear-end as its older brother, but with a solid list of no-fuss components, including a SRAM NX Eagle 12-speed groupset, for an everyman’s budget.
The design goal for the new Specialized 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, they had to get to work on dialing-in the materials, shapes, and the layout.
Specialized started by creating their own mountain-specific stiffness test, and then looked at the layout with Finite Element Analysis (FEA) to see where the biggest stiffness improvements could be made. This led to a big discovery: The Large and X-Large frames needed more front-end stiffness while the Smalls and Mediums were just fine. With this information, Specialized were able to create a frame design that was 20% more efficient. And in the end, this proved to be one of the lightest trail frames on the market, today.
When designing the frame with the stiffness targets being a main goal, they developed a radical new sidearm design for the 2019 Stumpjumper. The front-end and rear-end are connected at three points, and the sidearm helps keep all these points super stiff and connected, all while taking about 100 grams out of the rear-end. More explicitly, this minimizes frame flex when the rear suspension is active.
Continuing down the suspension path, both the fork and rear shock get a custom Rx Trail Tune. Suspension performance is highly dependent on frame, wheel, and rider size, so the Rx Tune allows for 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 for the Stumpjumper 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 the Specialized Stumpjumper easy to live with. Threaded bottom brackets make a triumphant return, and there’s room for up to a 3.0″ tire. You’re also free to run whatever aftermarket rear shock you want, since the 2020 Stumpy uses standard metric shocks. There’s a revamped SWAT box, too, making it sleeker, lighter, and with more volume.
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. Lastly, Specialized have seriously honed in their cable routing, making it as easy as can be on carbon models. Full tubes can be found throughout the carbon frame, so all you have to do is push the cable and it’ll come out the other end. No more lazy loop, hidden stashes of magnets, pokey spokes, or pillows to cry in.
For the build, the Specialized Stumpjumper Comp Carbon 2020 comes with a list of components that deliver undeniable quality, like a 12-speed SRAM NX Eagle drivetrain with RaceFace cranks, SRAM Guide R disc brakes, FOX front and rear suspension, and Roval Traverse 29 wheels.
Specialized Stumpjumper Comp Carbon 27.5 12-Speed 2020 Features
- The Stumpjumper’s asymmetrical, FACT 11m carbon fiber construction is lightweight, stiff, and ready to take on the trail. It’s built off the 27.5 Trail Geometry, so it’s just the right amount of both capable and comfortable.
- Custom RX Tune is applied by the in-house Suspension Team, ensuring that it’s perfectly paired for the specific kinematics of the bike, riding in the sweet spot with an ideal range of adjustability.
- The Flip-Chip allows you to change the frame geometry with ease, tailoring the ride to your style & the terrain ahead. There are two settings, High and Low, adjusting bottom bracket height by 6mm and the head tube angle by half-a-degree.
- Ultimate adjustability with standard stroke eye-to-eye metric shocks, a threaded BB system and up to 3.0″ tyre clearance.
- Improved cable routing waves good-bye to lazy loop, hidden stashes of magnets, pokey spokes or pillows to cry in.
- A new chainstay protector makes the drivetrain virtually silent, as well as eliminating chain slap. This is done through nubs disrupting the slap of the chain to reduce its movement and noise.
- SWAT Down Tube Storage takes everything from the last generation and makes it sleeker and lighter, while also adding 20% more volume.
2020 Specialized Stumpjumper Comp Carbon 27.5 12-Speed Build Highlights
- FOX Float Rhythm 34 GRIP Damper 150mm travel fork
- FOX Float DPS Performance shock
- SRAM NX Eagle 12-speed
- Roval Traverse 27.5 tubeless ready rims paired to Butcher/Purgatory 2.6″ tyres
- SRAM Guide R disc brakes
- X-Fusion Manic dropper post
FACT 11m, full carbon chassis and rear-end, asymmetrical design, 27.5 Trail Geometry, SWAT™ Door integration, threaded BB, fully enclosed internal cable routing, 12x148mm dropouts, sealed cartridge bearing pivots, replaceable derailleur hanger, 150mm of travel
FOX FLOAT Rhythm, 34, GRIP Damper, 44mm offset, 2-position sweep adjust, 15x110mm, tapered alloy steerer, 150mm of travel
FOX FLOAT DPS Performance, Rx Trail Tune, rebound and 3-position compression adjust, 210×52.5mm
Specialized, sealed cartridge bearings, 15x110mm spacing, 28h
Specialized, sealed cartridge bearings, 12x148mm thru-axle, 28h
DT Swiss Industry
Roval Traverse 27.5, hookless alloy, 30mm inner width, tubeless ready, 28h
Presta, 40mm valve
Butcher, GRID casing, GRIPTON® compound, 2Bliss Ready, 27.5 x 2.6″
Purgatory, GRID casing, GRIPTON® compound, 2Bliss Ready, 27.5 x 2.6″
SRAM NX Eagle, DUB, 170mm
SRAM DUB, threaded BB
Sram NX Eagle, trigger, 12-speed
SRAM NX Eagle, 12-speed
SRAM NX Eagle, 12-speed, 11-50t
SRAM NX Eagle, 12-speed
SRAM Guide R, hydraulic disc, organic pads, Guide S4 4-piston caliper, 200mm
SRAM Guide R, hydraulic disc, organic pads, Guide S4 4-piston caliper, 180mm
Specialized Trail, 6061 alloy, 8-degree backsweep, 6-degree upsweep, 27mm rise, 780mm, 31.8mm clamp
Specialized Sip Grip, half-waffle, S/M: regular thickness, L/XL: XL thickness
Specialized Trail, 3D-forged alloy, 4-bolt, 6-degree rise
Body Geometry Phenom Comp, Adaptive Edge design, hollow Cr-Mo rails, 143mm
X-Fusion Manic, infinite adjustable, two-bolt head, bottom mount cable routing, remote SRL LE lever, 34.9mm, S: 125mm, M/L/XL: 150mm of travel
Specialized Men’s Bike Sizing Guide
We have put together a general sizing guide for Specialized mountain, road & hybrid bikes. The table below is a general guideline to sizing, for an accurate guide to each Specialized model and also how to measure yourself.
|Rider Height||Suggested Bike Size|
Specialized Men’s Mountain Bikes
|5’2″ – 5’6″||S|
|5’6″ – 5’10”||M|
|5’10” – 6’2″||L|
|6’1″ – 6’4″||XL|
|6’4″ – 6’6″||XXL|