In 1981, the first mass-produced mountain bike, the Stumpjumper, was introduced, bringing the joy of mountain biking to people all over the world.
Forty-three years later, Specialized welcomes the 15th softtail version of the Stumpjumper. Of course, Specialized has seen many changes and innovations over the past four decades, but the goal of bringing more handling, passability, and fun to mountain riders has remained the same. Specialized's passion for cycling inspires Specialized to elevate the trail riding experience—for Specialized and for all trail riders who share Specialized's passion.
To make the Stumpjumper 15 a great trail bike, the Specialized Ride Dynamics team focused on elevating the highlights of the ride while reducing those frustrating moments. This approach has led to some major technological breakthroughs, setting a new trail benchmark in terms of improved passability, handling, and making it easier for riders to personalize their Stumpjumper 15 to suit their style and field.
GENIE is a major innovation in Stumpjumper 15. This game-changing air spring technology fulfills three of the cradle riders' desires: coil spring-like feel and handling, better base protection than standard air springs, and the fun of an adjustable "platform."
“有了GENIE的Stumpjumper 15，可以在一辆车上同时拥有长行程和短行程的优势。 ”——Allan Cooke，Specialized Mountain Marketing
Lindau magic carpet
Outstanding passability, handling, and personalization deliver more all-round performance to help more riders conquer more trails
A big breakthrough through sex
The Genie can handle about 16.3% more bumps than the "Mountain Bike of the Year" Stumpjumper EVO
The manipulation knows no bounds
Approximately 57% higher traction than Stumpjumper EVO
Set it up the way
6 geometry switches, hybrid wheel diameter or 29" switching, variable suspension curves, and more in one car
*For details on the test protocol and results, please refer to the Stumpjumper 15 / GENIE white paper.
Breakthrough passability
About 16.3% better bump management than the "Car of the Year" Stumpjumper EVO
To create Specialized's trail magic carpet, Specialized improved the car's ability to handle large drops and multiple trails. Suspension, geometry, frame, sizing system and accessories work together to tackle backcountry, impacts, steep descents, technical climbs, rocks, roots, drops and tight bends, giving you more performance and confidence for a memorable ride in more trail conditions.
Dream suspension
Forever changed the rules of the trail hanging game
The Specialized Ride Dynamics team has developed the suspension from the ground up to keep the car composure on steep drops, while still delivering the platform and agility of a short-range mountain bike when you need it.
The mountain bike is exceptionally supple on small to medium bumps, can withstand the impact of square edges, and feels confident when it comes to large drops, providing a solid platform when you need it, and very responsive to pedaling. Sounds too good to be true, but it is. In fact, tests have shown that the Stumpjumper 15 with GENIE reduces traction loss time by about 57 percent and priming by about 39 percent compared to standard air springs.
The Stumpjumper 15 with GENIE breaks the conventional wisdom that the more strokes, the more passability. For example, although the Stumpjumper 15 has 25mm less travel than the acclaimed Enduro, it offers travel that is on par with the Enduro in terms of quantity and quality in the "bump zone" range. The definition of a "bump zone" is the range of bump forces that occur during most situations during a trail ride. For a rider weighing around 155 pounds, the bump zone is usually between 700N and 1200N.
However, how does Stumpjumper 15 do it? In short, the Specialized Ride Dynamics team has developed a holistic approach to unique GENIE damping technology, leverage, kinematics and damping curves that work together.
Magic carpet tour
GENIE FULFILLS THREE OF THE TRAIL RIDERS' WISHES:
1. The supple experience and handling feel of a coil spring, with 16.3% higher bump management and 57% lower traction loss time compared to standard air springs.
2. Better anti-priming performance than ordinary air springs, about 39% less priming than standard air springs.
3. Adjustable platform for higher playability.
Chart bar: Slight bump performance, strong bump performance, easy adjustability, light weight
Chart columns: GENIE, gas springs, coil springs.
*For more details on the test protocol and research results, please refer to the Stumpjumper 15/GENIE white paper.
Heat the knife and cut the butter
Approx. 57% better traction than standard gas springs
There are many situations where you can experience the benefits of a "soft spring", such as when the washboard bends against the wall. In fact, controlled field tests have shown that the GENIE reduces traction loss time by about 57% compared to standard air spring shocks*. This is all thanks to the fact that the Genie technology provides the supple feel of a coil spring on high-frequency and small bumps – the wheels stay in contact with the ground for more time than a typical air spring. This contact creates traction that gives the rider greater control over speed and direction.
Goodbye at the bottom
About 39% less than a standard air spring, with a serious priming
In the face of large impacts, the curve of the last 30% of the GENIE stroke is extraordinary. As a result of this two-stage apparent rise rate, GENIE has reduced the frequency and severity of priming.
Fierce as a tiger, sweeping like a bee
The revolutionary two-stage suspension curve swallows up bumps while bringing a more playable platform
RIDING GENIE FOR THE FIRST TIME IS THRILLING BECAUSE IT'S UNLIKE ANY OTHER SUSPENSION YOU'VE EXPERIENCED. For example, an experienced driver would think that the car would "sink to the bottom" in successive corners because it was so smooth for most of the trip. UNEXPECTEDLY, GENIE OFFERS A PLATFORM YOU CAN TRUST, ALSO THANKS TO THE LATE-RISE SUSPENSION CURVE, WHICH MAKES THE BIKE BOTH FUN AND BUMPY LIKE A BIKE WITH MORE TRAVEL. You'll immediately readjust yourself to the "best of both worlds" ride experience that GENIE brings you. And if that's not cool enough, by installing or removing the gaskets in the air chamber, you can independently adjust the spring characteristics of the mid- and end-stroke to suit your style and the terrain of the day.
"The crazy thing about GENIE is that you can change its personality with different volumes of spacers. It opens up an unprecedented range of tuning. Sure, it solves serious underpinning problems, but what's really special is that you can have a crazy and efficient corner/jump weapon by installing spacers. Pull all the spacers out, and suddenly you have a big blast-gobbling plow. I can't say enough enough about experiencing both on the same bike — Specialized pretty much solves the bottoming problem and optimizes about 98% of the other trail experience. —Jeff Bowers, Lead Engineer, Stumpjumper 15
What is GENIE and how does it work?
The GENIE is Specialized's patent-pending gas spring-assisted (PSA) air spring innovation. By employing two separate but interconnected positive air chambers, the overall air volume is increased, resulting in a more gentle suspension curve in the first 70% of the shock stroke; This "softer" spring provides coil spring-like bump management throughout the bump zone. WHEN THE SHOCK COMPRESSES TO THE LAST 30% OF TRAVEL, THE GENIE SHOCK RING SLIDES AND CLOSES THE PORT TO THE EXTERNAL AIR CHAMBER, EFFECTIVELY REDUCING THE OVERALL VOLUME. This makes the spring curve of the last 30% of travel more gradual and more effective at preventing priming than standard air springs. It combines the advantages of coil springs and gas springs with additional adjustability and performance.
INNER AIR CHAMBER内气室、OUTER AIR CHAMBER外气室、GENIE AIR PORTS 气口、GENIE BAND避震环
| When both air chambers are opened, the amount of air in the GENIE increases. The Genie vent connects the inner and outer air chambers, making the curve of the first 70% of the shock stroke more gentle.
| IN THE FIRST 70% OF THE SHOCK TRAVEL, GENIE PORTS REMAIN OPEN, TAKING ADVANTAGE OF THE TWO CHAMBERS TO MAINTAIN A FLATTER SUSPENSION CURVE FOR BETTER GRIP AND BUMP MANAGEMENT.
| During the last 30% of the stroke, the Genie shock ring covers the Genie vent and closes the outer air chamber, resulting in a significantly higher rate of shock progression, preventing priming and providing a stable platform.
*For more details on the test protocol and research results, please refer to the Stumpjumper 15/GENIE white paper.
GENIE, THE MASTER OF SHOCK CURVES
Suspension curve detail
Compared to other air spring shocks on the market, the Genie allows for a lower spring rate in the front stroke and a higher slope at the end of the stroke (see figure). This means that the GENIE, with its "softer springs", is able to use more stroke to absorb the same amount of energy, resulting in excellent bump management and better handling. For example, as you can see in the graph, a shock force of about 1,080N compresses about 100mm of travel on both the Stumpjumper 15 and the Enduro, while the Stumpjumper EVO only uses about 86mm of travel to absorb the same force.
The diagram below illustrates the relationship between the impact force and wheel travel of the Stumpjumper 15 and Stumpjumper EVO. Note that the Stumpjumper 15 has about 16.3% more stroke for the same punch, suggesting that the Stumpjumper 15 with GENIE is superior in bump management compared to the Stumpjumper EVO.
Comparison of wheel force and stroke
Comparison of a single shock waveform
Frame frame frame of reference
Form follows fun
Specialized could have made a frame as stiff as possible if it wanted to, but it turned out to be too stiff. In order to achieve the integration of people and vehicles, it is necessary to consider smoothness in the frame design. Specialized designed the FACT 11M carbon fiber and M5 alloy frame (front, rear, and linkage) as a single unit to meet Specialized's stiffness goals for trail riding.
A key goal of the Stumpjumper 15 is to use materials and design as efficiently as possible to achieve performance goals. The elegant, clean "form follows function" frame design is data-driven. Extensive analysis has shown that Specialized's engineering team "spend" some grams to reinforce the suspension linkage, achieving stiffness more effectively than the previous single-sided arm design. In the end, Specialized was able to achieve telepathic control with a smaller mass.
Resistant to sinking
The Ride Dynamics team has set appropriate anti-sink targets for a variety of riding scenarios. As the quintessential trail mountain bike, the Stumpjumper 15 balances efficiency and bump management. Specialized benchmarks the vast majority of things it can touch, including Specialized's most recent bikes. Specialized collects and analyzes data and qualitative feedback to find ways to improve performance. When it comes to the Stumpjumper 15's anti-sink, Specialized strikes a balance between the previous-generation Stumpjumper and the Stumpjumper EVO, as both cars have excellent pedaling characteristics.
SWAT
Who said you can't take it?
The Stumpjumper 15's SWAT 4.0 further boosts the downtube storage volume, an innovation pioneered by Specialized. It is an embedded system that operates more smoothly and has higher weather resistance.
Unique geometry to create a trail magic carpet
Passing and manipulation of data validation
The car's geometry provides the passability of a large travel when you need it, a nimble feel on tight, curved sections, and efficient climbing performance. The spacious cockpit puts you in the center of the bike, optimizing traction and cornering handling. The low bottom bracket, slack head tube angle, and optimized fork offset keep you stable on rough terrain while allowing you to easily choose between a tail flick, an outside, or an inside. Specialized offers a range of sizes that are optimized for riders of all sizes, with three rear sizes.
*Geometry data shown are S3 sizes with the mid-head tube and high bottom bracket settings
Geometry as you like
Benchmark-level geometric adjustability
The Stumpjumper 15's highly integrated adjustability makes it a highly personalized trail bike. Six different geometry settings allow riders to adjust to suit riding style and terrain. The head tube angle can be adjusted in three positions between 63° and 65.5° with the unique eccentric upper bowl. By replacing the Horst Link gasket, the bottom bracket height can be fine-tuned up and down by about 7 mm. Turn it down for a more stable ride, and up for more clearance.
Bowl Angle: Steep/Medium/Relaxed, Tee: Low/High
| The eccentric upper bowl set can be adjusted in three positions between 63° and 65.5°
S-Sizing
Choose a size by style (not the length of your legs)
S-Sizing is based on what really matters: riding style, not leg length. Each of the six sizes has similar head tube angles and straddle heights, allowing you to choose the best fit for your riding style. The smaller S-Sizing size is more agile due to its shorter reach and front wheelbase, while the larger S-Sizing size provides better stability and more cabin space.
The first user is sam S2 size
I chose the S2 because of its shorter wheelbase and nimble feel for more maneuverability, which complements my style.
The second user is in PAT S3 size
I chose the S3 because of its medium wheelbase and balance, which allows me to ride on different mountain trails.
THE THIRD USER IS ROBIN S4 SIZE
The S4 was my choice because it had a large enough track and a stable ride feel that I was comfortable conquering my favorite steep, aggressive tracks at high speeds.
Large or mixed wheel diameters, your choice
Choose your favorite, without affecting geometry
With Specialized aftermarket linkages, you can choose between the rolling speed, traction and rolling advantage of large front and rear wheel diameters, or you can choose a 27.5" rear wheel for a more responsive, fun ride. Whichever you choose, there is little to no impact on the geometry and suspension characteristics that make the Stumpjumper 15 just right.
Stumpjumper几何表
Passing and manipulation of data validation
The geometry shown in the geometry table is the default state, i.e., the geometry with the head tube angle of "Middle" and the bottom bracket height of "High".
The head tube angle can be switched to a more relaxed 63° or a steeper 65.6° by adjusting the upper cup.
The bottom bracket height can be lowered by approximately 7mm by adjusting the Horst-link linkage and switching to the "low" setting.
S-Works Stumpjumper 15
MSRP: 79,990.00
S-Works Stumpjumper 15车架组
MSRP: 29,990.00
Stumpjumper 15 Pro
MSRP: 62,990.00
Stumpjumper 15 Expert
MSRP: 45,990.00
Stumpjumper 15 Comp
MSRP: 38,990.00
Editor: Yao