2023–2024 Harley-Davidson Touring Milwaukee-Eight 117 (FLHX Street Glide Special)

Development and Design

The redesign of the Street Glide for the 2023.5 model year was driven by a need to modernize the platform in aerodynamics, technology, and rider ergonomics. The most prominent change is the all-new batwing fairing. Developed using computational fluid dynamics (CFD) and wind tunnel testing, the new fairing is designed to reduce wind buffeting on the rider’s helmet by a claimed 60% compared to the previous generation. It features a “floating” windshield design and fully integrated LED signature lighting, which also incorporates the front turn signals for a cleaner, more streamlined appearance.

This design philosophy extends to the rest of the bodywork. The fuel tank has been reshaped with a sleeker profile, and the side covers flow more smoothly into the newly designed saddlebags. These saddlebags offer slightly more volume than their predecessors and carry the angular design language from the front fairing through to the rear of the motorcycle. The overall aesthetic is sharper and more contemporary while remaining instantly recognizable as a Street Glide.

Powertrain: The Milwaukee-Eight 117

At the heart of the updated model is the Milwaukee-Eight 117 V-Twin engine, which became the standard powerplant for the Street Glide Special, replacing the previously standard Milwaukee-Eight 114. This engine displaces 117 cubic inches (1,923 cc) and features a significant update: a new liquid-cooling system focused on the cylinder heads. This targeted cooling approach is primarily aimed at improving thermal comfort for the rider by reducing the amount of heat felt in slow-moving traffic. It also allows for a higher compression ratio (10.3:1), contributing to more efficient combustion and improved performance output across the rev range. The engine is paired with a high-flow exhaust system and a redesigned airbox to optimize airflow.

Power is delivered through a 6-speed Cruise Drive transmission and a carbon-fiber reinforced belt final drive, a hallmark of Harley-Davidson’s touring motorcycles. The motorcycle also comes standard with Rider Safety Enhancements, a suite of electronic aids including Cornering Enhanced Antilock Braking System (C-ABS), Cornering Enhanced Traction Control System (C-TCS), and Drag-Torque Slip Control System (DSCS).

Chassis, Suspension, and Ergonomics

While the core steel frame remains, the chassis and suspension received critical updates to improve handling and comfort. The most notable improvement is in the rear suspension. New dual outboard emulsion-technology shock absorbers provide 3.0 inches (76 mm) of travel, a significant 50% increase over the previous generation. This added travel greatly enhances ride quality, particularly over rough surfaces. The front suspension consists of 49mm dual bending valve forks.

Ergonomics were also a key focus of the redesign. The motorcycle features a new one-piece stitched seat designed for better long-distance support. The handlebars have been repositioned to provide a more relaxed and natural riding posture. These changes, combined with the improved aerodynamics, contribute to reduced rider fatigue on extended journeys. The updated model is also lighter than its predecessor, shedding approximately 18 pounds (8.2 kg), which contributes to easier handling at low speeds and improved agility.

Infotainment and Technology

The 2023-2024 Street Glide Special marks a major technological leap forward with the introduction of the Skyline™ OS infotainment system. The traditional analog gauges and smaller screen of the previous Boom! Box GTS system have been completely replaced by a single 12.3-inch, full-color TFT touch-screen display. This expansive, anti-glare screen is the central hub for all vehicle information, ride modes, navigation, and entertainment.

The system features three unique display modes (Cruise, Sport, and Tour) that prioritize different information based on rider preference. It includes a built-in navigation system and offers connectivity via Apple CarPlay for seamless smartphone integration. All lighting on the motorcycle is full LED, enhancing visibility and completing the modern technological package.

Differences from the Previous Generation (Pre-2023)