2024-2026 Harley-Davidson CVO Street Glide ST: Milwaukee-Eight 121 High Output Performance Bagger

The Harley-Davidson CVO Street Glide ST is the batwing-faired performance member of the CVO Touring line, built around the factory-custom vocabulary of Custom Vehicle Operations and the harder-edged mechanical brief of the modern performance bagger. It belongs to the same 2024-2026 CVO Touring generation that brought a major redesign of Harley-Davidson’s premium bagger platform: updated bodywork, a large TFT interface using Skyline OS, advanced rider-assistance electronics, and the 121-cubic-inch Milwaukee-Eight architecture in high-output form.

Its importance is not that Harley-Davidson made another expensive touring motorcycle. The CVO Street Glide ST sits where three modern Harley strands intersect: the long-running FLHX Street Glide lineage, the factory CVO premium program, and the racing-influenced bagger movement shaped by King of the Baggers and MotoAmerica’s Baggers racing era. The result is a motorcycle that speaks directly to riders and collectors who understand the difference between a chrome-heavy luxury CVO and a factory performance bagger with a 121 High Output engine.

Best Known For: the CVO Street Glide ST is best known as Harley-Davidson’s premium batwing-faired performance bagger, pairing the CVO treatment with the Milwaukee-Eight 121 High Output engine and ST-style sport-touring equipment.

Quick Facts

The following table summarizes the core identity of the CVO Street Glide ST. Exact equipment can vary by market and model year, so a factory build sheet or VIN-linked Harley-Davidson dealer record remains the best confirmation for a specific motorcycle.

For enthusiasts, the important distinction is that this is not merely a Street Glide with paint and audio. The ST specification points to a performance bagger brief, while CVO adds the factory-custom equipment level, exclusive finishes, premium electronics and limited-production character that have long separated CVO machines from standard Touring models.

Why It Matters

The CVO Street Glide ST matters because it reflects a significant shift in Harley-Davidson’s premium touring strategy. For years, CVO Touring motorcycles were defined primarily by paint, chrome, audio, displacement and comfort. The ST models moved the conversation toward horsepower, lean-angle ambition, sportier ergonomics, darker finishes, weight-conscious details and racing-adjacent identity.

That shift did not appear in a vacuum. Harley-Davidson’s contemporary bagger racing efforts, the visibility of King of the Baggers, and the aftermarket’s long obsession with big-inch FL touring performance changed what a high-end bagger could be. The CVO Street Glide ST is a factory answer to a culture that had already been building fast baggers with suspension, brakes, cams, exhaust, carbon parts and serious engine work.

For collectors, the appeal is likely to rest on three points: it is a CVO, it uses the 121 High Output engine, and it belongs to the first generation of Harley-Davidson touring machines built around the new digital cockpit and post-2023 CVO body architecture. That combination gives it a clearer identity than many appearance-led special editions.

Historical Context and Development Background

Harley-Davidson’s Touring platform has been the company’s most commercially important large-displacement family for decades. The Street Glide, introduced as a stripped-down hot-rod bagger interpretation of the Electra Glide concept, became one of the defining motorcycles of modern Harley culture. Its fork-mounted batwing fairing, hard bags, low stance and clean rear profile made it a favorite among both long-distance riders and custom builders.

The 2024-2026 CVO Touring generation arrived after Harley-Davidson had already reshaped its image around several parallel projects: the Milwaukee-Eight engine family, the Pan America adventure platform, the Low Rider ST performance cruiser, and factory involvement in bagger racing. In that climate, a top-tier CVO touring model could no longer rely purely on paint, audio and cubic inches. It needed a credible performance story.

The competitor landscape also mattered. Indian’s Challenger and Pursuit platform, with a liquid-cooled PowerPlus engine and sporting frame-mounted fairing option, sharpened the American bagger contest. At the same time, custom shops and performance specialists were building high-horsepower touring Harleys with serious suspension and braking upgrades. The CVO Street Glide ST is best understood as a factory-built response to that market: still recognizably Harley, still unmistakably a Street Glide, but aimed at riders who wanted CVO exclusivity without surrendering the ST performance message.

Engine and Drivetrain

The mechanical center of the CVO Street Glide ST is the Milwaukee-Eight 121 High Output engine. It is a 45-degree, pushrod, four-valve-per-cylinder V-twin in the Milwaukee-Eight family, displacing 121 cubic inches, or 1,977 cc. In High Output form, Harley-Davidson factory specifications have listed 127 horsepower and 145 lb-ft of torque for the 121 HO engine used in the CVO ST performance bagger application.

The 121 High Output should not be confused with the more touring-luxury-focused Milwaukee-Eight 121 VVT specification used in other CVO Touring models. The ST engine tune is intended to be sharper and more performance-oriented, using factory calibration and breathing hardware consistent with the ST role. It remains a traditional Harley big twin in architecture: pushrods, hydraulic lifters, separate primary drive, wet multi-plate clutch and belt final drive.

Fuel, Ignition, Lubrication and Primary Drive

Fuel delivery is by electronic sequential port fuel injection. Ignition and engine management are fully electronic, integrated with the ride modes and rider-assistance systems used on modern CVO Touring models. Lubrication follows the Milwaukee-Eight dry-sump big-twin pattern, with the engine oil supply separate from the primary and transmission lubricant circuits.

Primary drive is by chain within the primary case, driving a wet multi-plate clutch. The six-speed Cruise Drive gearbox remains part of Harley-Davidson’s modern touring formula: tall-legged enough for highway mileage, but with the low-speed torque spread expected from a large-displacement American V-twin. Final drive is by belt, a choice Harley has refined over decades for touring use because it is clean, quiet and durable when correctly aligned and maintained.

Engine and Drivetrain Specifications

This table includes the specifications that define the CVO Street Glide ST mechanically. Where Harley-Davidson published horsepower and torque for the Milwaukee-Eight 121 High Output application, those figures are included; market-specific documents should be checked for certification-language differences.

These numbers place the ST version in a different conversation from earlier factory 114 and 117 Touring models. The factory rating is not aftermarket drag-bike territory, but it is a substantial output claim from a warranty-backed Harley-Davidson touring machine carrying saddlebags, full electronics and long-distance equipment.

Chassis, Suspension and Braking

The CVO Street Glide ST uses Harley-Davidson’s modern Touring chassis philosophy: a large steel frame built for carrying a big twin, hard luggage, rider, passenger equipment and highway load while still allowing the motorcycle to respond to performance-oriented setup changes. The Street Glide identity is defined by its fork-mounted batwing fairing, which gives a different steering and wind-management feel from the frame-mounted Road Glide.

Suspension specification is an important part of the ST story. The CVO ST machines are positioned above standard Touring models, and factory literature for the performance CVO bagger line emphasizes premium suspension and braking hardware rather than merely cosmetic upgrades. Braking is supported by linked ABS functions and modern rider-assistance electronics, a major difference from older Twin Cam and early Milwaukee-Eight baggers where chassis upgrades were often left to the owner.

Chassis and Equipment Reference

For identification and buying purposes, the following items are more useful than generic comfort claims. They help separate a true CVO Street Glide ST from a standard Street Glide, Street Glide ST, or appearance-modified FLHX.

The batwing fairing remains central to the motorcycle’s character. A Street Glide does not steer or slice air exactly like a Road Glide because the fairing mass moves with the bars. That difference is one reason Harley keeps both models alive: buyers are not simply choosing a face, they are choosing a front-end feel.

Riding Experience and Mechanical Character

A CVO Street Glide ST starts like a modern injected Harley, not like a carbureted Evo or shovelhead. There is no enrichener ritual, no tickling of a carburetor and no mechanical negotiation with cold iron. Keyless ignition, electronic fuel injection and the TFT interface make the start procedure contemporary, but the engine’s first revolutions still deliver the familiar uneven cadence of a large 45-degree Harley V-twin.

The 121 High Output engine gives the motorcycle a more urgent personality than a conventional luxury CVO tourer. It is not merely a low-rpm lope; it has a stronger midrange charge and a more serious top-end intent by Harley touring standards. The torque arrives in a broad, heavy wave, but the ST calibration and breathing equipment make it feel less like a dress-tourer engine and more like a factory-sanctioned answer to the performance-bagger aftermarket.

The clutch and gearbox retain the familiar big-twin touring feel: deliberate rather than delicate. Shift action is not Japanese-sportbike light, but the six-speed box suits the engine because it lets the rider lean on torque rather than chase revs. At highway speed the machine settles into the long-legged rhythm Harley riders expect, with the fairing, bags and electronics turning a performance package into a usable touring motorcycle.

Low-speed handling is still that of a large touring Harley, and no serious rider should confuse the ST badge with a middleweight sport motorcycle. The point is not lightness for its own sake; the point is a full-sized bagger with factory power, electronics and chassis equipment that make it more composed when ridden hard. The brakes and suspension matter because a 121-cubic-inch touring motorcycle asks more of both than a boulevard cruiser ever will.

Identification and Originality

Correct identification begins with the VIN, factory model code and dealer documentation. The CVO Street Glide ST is commonly associated with the FLHXSTSE model-code structure: FLHX for the Street Glide family, ST for the performance touring trim identity, and SE traditionally indicating CVO Screamin’ Eagle / Custom Vehicle Operations positioning. Buyers should not rely on badges, paint, black trim or saddlebags alone, because those pieces can be added to lesser FLHX models.

Originality on a modern CVO is different from originality on a Knucklehead or Panhead, but it is no less important. Paint, CVO-specific finishes, audio equipment, TFT system, trim pieces, wheels, saddlebags, exhaust parts and engine hardware all affect whether a motorcycle remains a true CVO ST rather than a modified Street Glide with desirable parts. Because CVO paint and trim packages can be expensive and model-specific, replacement bodywork deserves close scrutiny.

Collectors should confirm that the engine specification matches the 121 High Output identity. A standard CVO Street Glide with the non-ST 121 specification, a non-CVO Street Glide ST, and a CVO Street Glide ST may appear similar to casual observers, but they are not the same motorcycle. The highest-quality examples will retain their original paint scheme, factory infotainment hardware, correct CVO equipment, original owner materials and clean service documentation.

Common Identification Clues

Useful identification clues include the batwing fairing rather than the frame-mounted Road Glide nose, CVO Touring digital cockpit, ST performance trim, 121 High Output engine reference in documentation, CVO-specific paint and trim, and the correct model code in paperwork. Because Harley-Davidson buyers often personalize motorcycles early in ownership, documentation carries unusual weight on these machines.

Model Code and Variant Breakdown

The CVO Street Glide ST should be considered alongside the closely related CVO Touring models because many buyers cross-shop them and many used-market listings confuse them. The table below separates the major related variants without treating trim color or audio packages as separate models.

This is the area where used-market listings require discipline. A blacked-out Street Glide with aftermarket parts is not a CVO Street Glide ST. A CVO Street Glide is not automatically an ST. A Road Glide ST shares the performance-bagger idea but not the steering feel or fairing layout of the FLHX-based Street Glide.

Performance and Dimensional Specifications

Harley-Davidson factory literature for the Milwaukee-Eight 121 High Output CVO ST application lists 127 horsepower and 145 lb-ft of torque. Those are the key performance figures to preserve because they define the ST model’s place above earlier 114 and 117 touring models. Published acceleration, quarter-mile and top-speed claims are not consistently treated as factory reference figures for this motorcycle, so they should not be used as identification-grade data.

Weight and dimensional specifications can differ by market equipment, emissions configuration and accessory fitment. Serious buyers should compare the exact model-year Harley-Davidson specification sheet against the motorcycle in front of them, particularly where exhaust, audio, luggage, crash protection or dealer-installed accessories have changed curb weight.

Compared With Related Models

CVO Street Glide ST vs CVO Street Glide

The CVO Street Glide is the luxury flagship interpretation of the batwing bagger. The CVO Street Glide ST is the performance-bagger interpretation. The difference is not simply cosmetic: the ST identity is tied to the 121 High Output engine brief and a more aggressive factory personality.

A buyer choosing between them should decide whether the priority is maximum CVO touring luxury or the factory’s sharper performance-bagger statement. Both carry CVO desirability, but they speak to different collecting instincts.

CVO Street Glide ST vs CVO Road Glide ST

This is the most meaningful comparison. Both belong to the CVO ST performance-bagger world and both are associated with the Milwaukee-Eight 121 High Output specification. The choice turns on fairing philosophy: fork-mounted batwing for Street Glide, frame-mounted sharknose for Road Glide.

Road Glide riders often value the calmer steering feel of the frame-mounted fairing, especially at high speed and in crosswinds. Street Glide riders often prefer the traditional batwing view, the visual compactness of the front end and the long cultural association of the FLHX with custom bagger style.

CVO Street Glide ST vs Street Glide ST

The non-CVO Street Glide ST is the more accessible performance touring model. It carries the ST idea but not the same CVO production status, equipment level, paint execution or 121 High Output CVO identity. For riders who modify heavily, the standard ST may be the more logical starting point; for collectors, the CVO ST’s factory specification and documentation matter more.

Restoration and Ownership Notes

Because the CVO Street Glide ST is a modern motorcycle, restoration usually means preservation, correct repair and return-to-stock work rather than archaeological rebuilding. The most expensive originality issues are likely to involve painted bodywork, CVO-specific trim, audio and infotainment components, electronic modules, exhaust equipment and any ST-specific performance parts. A mechanically sound but cosmetically altered example can become surprisingly expensive to correct.

Parts support through Harley-Davidson and the aftermarket is strong for the Touring platform, but CVO-specific parts are not always as straightforward as standard FLHX pieces. Paint-matched components, limited CVO finishes and certain trim items can become difficult or costly if discontinued. Documentation of original equipment, recall work, software updates and dealer service should be treated as part of the motorcycle’s value.

Engine rebuild considerations are those of a high-output modern Milwaukee-Eight, not an old loose-tolerance big twin. Correct oiling, cooling, calibration, cam-chest inspection, clutch condition and belt alignment all matter. Modified examples should be judged carefully, particularly if exhaust, intake, cam, tuner or emissions equipment have been changed without clear records.

Buyer and Restoration Inspection Points

A good inspection of a CVO Street Glide ST should be more exacting than a generic Touring-bike walkaround. The point is not merely to determine whether it runs; the point is to determine whether it remains a correct CVO ST with its expensive model-specific equipment intact.

The best examples are usually the least ambiguous: correct VIN, original CVO finish, unmolested electronics, documented service and tasteful restraint with modifications. A heavily altered CVO ST may be an excellent rider, but it becomes harder to value as a collectible factory specification.

Collector and Market Relevance

CVO models have long occupied a distinct place in the Harley market. They are not limited-production homologation specials in the racing sense, but they are factory premium machines with restricted annual availability, distinctive paint and equipment, and a buyer base that often preserves documentation. The CVO Street Glide ST adds a stronger performance identity than many earlier CVO Touring models.

Its market relevance is tied to the modern performance-bagger movement. Collectors increasingly recognize that factory motorcycles associated with a major cultural and engineering shift can become important even when they were not rare in the antique sense. The CVO Street Glide ST represents the moment Harley-Davidson’s premium bagger line moved closer to the language of cammed, suspended, braked and dyno-tuned custom baggers.

What collectors are likely to value most is originality of specification: factory paint, correct ST equipment, intact CVO electronics, unmodified or sympathetically modified engine hardware, and clean provenance. Mileage will matter, but condition and documentation may matter more because these motorcycles are complicated and expensive to correct once altered badly.

Cultural Relevance

The CVO Street Glide ST belongs to the same cultural moment that made bagger racing unexpectedly serious. King of the Baggers and related race programs changed public expectations for large American touring motorcycles. A full-dress Harley with saddlebags could now be discussed in terms of cornering clearance, braking, horsepower and race-developed image without sounding like a contradiction.

Harley-Davidson did not turn the Street Glide ST into a race bike, and it should not be judged as one. Its cultural force is subtler: it normalizes the idea that the most prestigious factory bagger can be performance-led rather than chrome-led. For riders raised on club-style Dynas, FXRs, Low Rider STs and high-horsepower touring builds, that matters.

FAQs

What engine is in the Harley-Davidson CVO Street Glide ST?

The CVO Street Glide ST is associated with the Milwaukee-Eight 121 High Output engine, a 121 cu in / 1,977 cc 45-degree pushrod V-twin. Harley-Davidson has listed the 121 High Output CVO ST application at 127 hp and 145 lb-ft of torque.

What is the model code for the CVO Street Glide ST?

The code commonly associated with the CVO Street Glide ST is FLHXSTSE. Because Harley-Davidson model codes and market listings can be confused in used advertisements, buyers should confirm the VIN and factory documentation rather than relying on emblems or seller descriptions.

How is the CVO Street Glide ST different from the CVO Road Glide ST?

The major difference is the fairing. The CVO Street Glide ST uses the fork-mounted batwing fairing of the FLHX Street Glide line, while the CVO Road Glide ST uses the frame-mounted sharknose fairing of the FLTR family. Both are tied to the modern CVO ST performance-bagger concept.

Is the CVO Street Glide ST the same as a regular Street Glide ST?

No. The regular Street Glide ST is a non-CVO performance touring model, while the CVO Street Glide ST carries CVO-level equipment, finishes, electronics and the 121 High Output CVO performance identity. The two can look similar after modifications, which is why paperwork matters.

What makes the CVO Street Glide ST collectible?

Its collectibility rests on CVO status, the 121 High Output engine, ST performance-bagger positioning, limited annual availability and its place in the first redesigned CVO Touring generation using the new digital cockpit and contemporary bodywork. Original paint and documentation are especially important.

Are parts available for the CVO Street Glide ST?

Mechanical support is strong because the motorcycle is based on Harley-Davidson’s Touring platform. CVO-specific paint, trim, electronics and certain model-specific parts can be more costly or less readily available than standard FLHX parts, which is why preserving original equipment is important.

What should a buyer check before purchasing one?

Confirm the VIN and model code, verify the 121 High Output engine specification, inspect CVO paint and bodywork, test the TFT and audio systems, check suspension and brake condition, and review all service and modification records. Modified exhaust and tuning work deserve particular scrutiny.

Collector Takeaway

The CVO Street Glide ST is significant because it captures Harley-Davidson at a point where the company’s premium touring motorcycles had to answer a new question: could a factory bagger be both a luxury CVO and a credible performance machine? With the 121 High Output engine, ST identity and modern CVO Touring platform, this model says yes in a way that earlier chrome-forward CVOs did not need to attempt.

For the collector, the motorcycle to buy is the one that still looks like Harley-Davidson built it: correct model code, original CVO finish, intact electronics, documented service and no poorly executed performance shortcuts. Its long-term importance will not come from nostalgia alone. It will come from being a factory marker of the performance-bagger era, when the American touring motorcycle became a serious object of horsepower, chassis and cultural ambition.