Halfway down a raw, off-camber chute on Galbraith last week, I realized I was carrying speed I wouldn’t have tried on the standard Stumpjumper 15. Not because I’d gotten braver. Because the bike had. The FOX FLOAT X GENIE piggyback shock sat deep into the travel without blowing through, the 160mm fork held the front end planted on a root shelf I’d normally feather-brake through, and the higher-rise bars gave me enough leverage to redirect mid-chute without standing up off the saddle.

That’s the whole thesis of the MY26 Stumpjumper 15 EVO in one moment. Specialized killed the standard Stumpjumper 15 and made every model an EVO. More travel up front, a better shock, more aggressive cockpit geometry. The trail bike grew teeth.

Quick Verdict

Aspect	Rating
Descending	★★★★★
Climbing Efficiency	★★★★☆
Suspension Quality	★★★★★
Value	★★★☆☆
Component Spec	★★★★☆

Best for: Aggressive trail riders who push into enduro terrain without wanting a dedicated enduro bike Skip if: You prioritize climbing efficiency above all else, or your trails are smooth enough that 160mm is overkill S-Works EVO: $11,299 | Expert Di2: $6,199 | Shimano builds shipping now, SRAM versions later in 2026 Price: Starting ~$4,499 | Specialized

The Standard Stumpjumper 15 Is Gone

This is the headline that matters most for anyone shopping the 2026 lineup: there’s no more “standard” Stumpjumper 15. Every MY26 model is an EVO. The aggressive variant that used to sit above the base model in the lineup is now the only option.

What changed from the previous Stumpjumper 15:

• Fork travel: 160mm, up from 150mm
• Rear shock: FOX FLOAT X GENIE piggyback across the lineup (replaces non-piggyback Float X on base models)
• Cockpit: Higher-rise bars as standard
• Geometry: Tweaked to match the added travel — slightly slacker head angle, adjusted reach

Specialized isn’t the first brand to collapse two models into one aggressive option. But doing it across the entire price range — from the base build through the $11,299 S-Works — is a clear statement about where they think trail riding is heading.

Testing Context

Bike: Stumpjumper 15 EVO Expert Di2, size Large Test period: February – March 2026 Trails: Galbraith Mountain, Tiger Mountain, Duthie Hill (Pacific Northwest) Conditions: Late winter mix: wet roots, standing water, freeze-thaw hardpack, some early spring dust Comparison bikes: Trek Fuel EX Gen 7 (EX configuration), previous-gen Stumpjumper 15 (non-EVO) Drivetrain: Shimano XTR Di2 wireless

I also spent a day on the S-Works build at a Specialized demo event. The suspension feel was identical to the Expert; the weight savings from the S-Works frame and components were noticeable on sustained climbs but irrelevant on descents.

The FOX FLOAT X GENIE Piggyback Shock

This is the component upgrade that justifies the EVO-only lineup more than anything else. The GENIE piggyback shock runs a secondary air reservoir that manages oil temperature and provides a more consistent damping curve through repeated hard hits.

On the previous non-EVO builds, the standard Float X was fine on most trail terrain. It started to fade on sustained, high-speed descents — the kind where you’re loading the shock hard every two or three seconds for minutes at a time. The shock would heat up, the oil thinned, and the rear end got progressively less controlled.

The GENIE fixes that. On a 2,400-foot descent at Galbraith (rocky, rooty, fast) the shock felt the same at the bottom as it did at the top. Consistent. That’s not a small thing on a trail bike running 145mm of rear travel.

Setup was straightforward. I ran 30% sag with two clicks of high-speed compression added from Specialized’s baseline. The piggyback reservoir doesn’t change the setup process, but the shock rewards precision. Running sag too high (35%+) made the rear end wallow on successive hits. At 30%, it sat firm on pedaling platforms and opened up properly under load.

On the Trail

Descending

The 160mm fork and piggyback shock combine to make the EVO feel like it’s operating at a different tier than the old 150mm non-EVO build. Not just 10mm of extra travel. The character of the front end changes. The fork sits higher in the travel at speed, which keeps the head angle from steepening on sustained descents. On loose-over-hardpack, the front wheel tracked without the mid-corner vagueness I’d occasionally fight on the 150mm setup.

On chunk at speed, the bike is settled. Square-edged hits that would have kicked the rear on the non-piggyback shock were absorbed without the chassis pitching forward. The GENIE’s fade resistance meant I could run a slightly firmer setup than I would on a standard Float X without worrying about harshness on extended descents.

High-speed stability is excellent. The geometry, the 160mm fork, the piggyback shock. It all stacks up into a bike that stays composed when you’re carrying more speed than a 145mm-travel bike has any right to carry.

Climbing

The EVO climbs well for what it is. That qualifier matters. This is a 160mm-fork trail bike with aggressive geometry and a piggyback shock. It’s not an XC bike, and it doesn’t pretend to be.

On sustained fire road climbs, the shock platform is firm and the pedaling position works. The higher-rise bars shifted my weight slightly over the front wheel compared to the previous cockpit, which helped traction on loose climbs but made long seated efforts marginally less comfortable in the lower back.

Technical climbing is a strength. The 160mm fork gives you enough wheel clearance to roll over obstacles that would require line choice on a shorter-travel bike, and the rear shock tracks well enough on roots and rocks that traction stays consistent.

Where it falls short: steep, efficient XC-style climbing where every gram of rotating weight and every degree of seat angle matters. The EVO loses that comparison to the Trek Fuel EX Gen 7 in its standard EX configuration, which has a more pedaling-optimized geometry. For riders who spend 60% or more of their rides climbing, that trade-off is real.

Technical Trail

Tight switchbacks, slow-speed tech, rock gardens at walking pace. The EVO handles all of it better than the standard 15 did. The higher-rise bars give you more steering authority at low speed that the old flat bar setup lacked. Nose-heavy moments on steep rollovers are rarer because the fork travel provides more room to weight the rear wheel.

The suspension is active enough at low speed that the wheels stay in contact with uneven surfaces during slow tech sections. Some piggyback shocks feel locked out at low input speeds; the GENIE doesn’t have that problem.

The Shimano XTR Di2 Build (Expert Di2, $6,199)

The Expert Di2 build pairs the EVO frame with Shimano’s XTR M9200 Di2 wireless drivetrain. Shifting is precise, fast, and consistent regardless of chain tension. Under load on a steep climb, the Di2 shifts cleaner than any mechanical drivetrain I’ve used on this bike platform.

Battery life across my test period was a non-issue. Over three weeks of regular riding — roughly 15 rides totaling 200+ miles — I charged the rear derailleur once. The front shifter battery (on builds that include a front derailleur, which the EVO does not) is irrelevant here since the EVO runs 1x.

At $6,199, the Expert Di2 is the build I’d recommend for most riders who want the full EVO experience without paying the S-Works premium. The frame is the same FACT carbon as the S-Works at this tier. The suspension spec is identical. The weight difference between Expert and S-Works is real — about 400-500g — but comes primarily from the wheelset and finishing kit, not the frame or suspension.

S-Works EVO ($11,299): Who It’s Actually For

The S-Works gets lighter wheels, a lighter finishing kit, and the prestige factor. The frame and suspension are shared with the Expert builds at the carbon tier.

At $11,299, the S-Works makes sense for two groups: riders who race and need every gram advantage, and riders for whom $11,299 isn’t a painful number. Everyone else should look at the Expert Di2 at $6,199, which delivers 90%+ of the performance at 55% of the cost.

The weight savings won’t change how the bike descends. They will change how it climbs — noticeably on long days, marginally on short rides. Your call on what that’s worth.

Durability: Early Observations

A month of hard riding in wet PNW conditions isn’t a full durability test, but some early notes:

Frame: The FACT carbon has held up to mud, rock spray, and one low-speed crash into a berm lip. No structural concerns. Specialized’s downtube protection covered the obvious impact zone.

Shock: The FOX FLOAT X GENIE piggyback adds bulk and a few connection points for mud to collect. I hosed the shock down after every muddy ride. No seal issues, no air pressure loss, no oil weep.

Bearings: Pivots are smooth. The Stumpjumper 15 platform has a strong durability track record at the pivot hardware level, and nothing in the EVO changes that.

What I can’t tell you yet: Long-term piggyback seal wear, bearing longevity past the 6-month mark, and how the shock body handles sustained rock spray on extended wet-season riding.

Setup and Maintenance

Shock Setup

Start at 30% sag. The GENIE responds well to small adjustments — half-turn changes on the compression dials produce noticeable differences in ride feel. I added two clicks of high-speed compression from Specialized’s baseline and left low-speed compression at stock. Rebound: start one click slower than the middle of the range and adjust from there.

The piggyback reservoir doesn’t require separate setup. It’s pressurized at the factory and operates passively.

Fork Setup

The 160mm Fox 36 (on most builds) pairs well with the EVO’s geometry. Run sag at 25-27%. On this particular bike, I found that going below 25% sag on the fork made the front end too high, which steepened the effective seat angle and hurt climbing traction. The 160mm travel gives you enough room to run slightly higher sag without bottoming out on moderate hits.

Cockpit

The higher-rise bars are a welcome default. I didn’t feel the need to swap stems or bar rise on the Expert build. Riders under 5’8” on a size Medium may want to check the stack height — the combination of 160mm fork and higher bars creates a tall front end that could feel stretched on smaller frames.

vs. Trek Fuel EX Gen 7

This is the comparison most riders are making in 2026. The Trek Fuel EX Gen 7 in its EX configuration (145mm rear, 150mm fork) is a more moderate trail bike than the EVO. The Fuel’s strength is modularity — swap a rocker link and you get three travel configurations from one frame.

Where the EVO wins: Descending authority. The piggyback shock and 160mm fork give the EVO a composed, planted feel on rough terrain that the Fuel EX’s base configuration can’t match. If your trails are rough, rocky, or fast, the EVO handles it with less effort.

Where the Fuel EX wins: Climbing efficiency and versatility. The Fuel EX in EX mode is a better pure trail bike for riders who split their time evenly between climbing and descending. And the modular conversion to LX (160/170mm) gives Trek’s frame a long-term flexibility argument the Stumpjumper can’t match.

Where the Fuel EX LX configuration competes: Once you convert the Fuel to LX, the travel numbers overlap with the EVO. But the EVO’s piggyback shock and purpose-built geometry still give it an edge on sustained descending. The Fuel LX is converted trail geometry; the EVO is purpose-built aggressive trail geometry. That difference shows up when you push hard.

The price question: The Fuel EX Gen 7 starts lower than the EVO lineup and offers carbon frames at competitive prices. If budget matters, the Fuel EX with a $120 rocker link swap to LX gives you close-to-EVO capability at a lower price point, though without the piggyback shock quality.

Who Should Buy This

Aggressive trail riders who flirt with enduro. You ride terrain that a 150mm trail bike handles but doesn’t dominate. You want more composure on descents without committing to a full enduro frame. The EVO fills exactly that gap.

Riders replacing a Stumpjumper 15. If you’re on a previous-gen Stumpjumper 15 and ready to upgrade, the EVO is the natural progression. The piggyback shock alone justifies the move if you’ve ever felt the old Float X fade on longer descents.

Riders who value descending confidence on a trail bike platform. The EVO gives you enduro-adjacent composure with trail-bike climbing manners. If your local trails are steep, rocky, and reward carrying speed, this is your bike.

Who Should Skip This

Climbing-first riders. If you spend 70% of your ride going up and want maximum efficiency, the EVO’s geometry and weight work against you. Look at the Fuel EX Gen 7 in standard EX configuration, or a dedicated short-travel trail bike.

Riders on smoother trails. If your local terrain is flow trails, groomed singletrack, or moderate grades without sustained chunk, 160mm of fork travel and a piggyback shock are solving a problem you don’t have. You’re paying for capability you won’t use.

Budget-conscious buyers. The EVO lineup starts around $4,499, and the builds worth recommending start at $6,199 for the Expert Di2. If your budget is under $4,000, look at the Fuel EX Gen 7 alloy or consider the Orbea Rallon RS as an alternative platform. The Shimano Deore Di2 wireless drivetrain also opens up mid-range electronic shifting on less expensive builds.

SRAM Builds: Coming Later

Specialized confirmed that SRAM-equipped EVO builds ship later in 2026. If you’re committed to the SRAM ecosystem, especially the SRAM XX DH wireless transmission for gravity-focused riding, you’ll need to wait or buy the Shimano build and swap components. Given the Di2’s performance on this platform, I wouldn’t hold off unless SRAM compatibility is non-negotiable for your component ecosystem.

The Bottom Line

The 2026 Stumpjumper 15 EVO is Specialized’s clearest statement yet about where trail bikes are headed: more capable, more aggressive, with suspension quality that used to be reserved for enduro platforms. Killing the standard Stumpjumper 15 was a bold move. After a month on the EVO, it’s the right one.

The FOX FLOAT X GENIE piggyback shock is the single biggest upgrade. It transforms how the rear end behaves on sustained descents, and it’s now standard across every build. The 160mm fork and higher-rise bars complete the picture without pushing the bike into enduro territory where it doesn’t belong.

At $6,199 for the Expert Di2, the EVO is expensive but competitive. At $11,299 for the S-Works, it’s for a specific buyer. Either way, the bike delivers on its promise: trail bike geometry with the composure to ride harder than a trail bike should.

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Tested on Stumpjumper 15 EVO Expert Di2 (size Large) and S-Works EVO (demo day), Pacific Northwest trails, February–March 2026. Back-to-back comparison with Trek Fuel EX Gen 7 and previous-gen Stumpjumper 15. No manufacturer compensation accepted.