| Component | Specification |
|---|---|
| Engine | Milwaukee-Eight 107 CUI V-Twin |
| Production Years | 2018-present |
| Oil Grade/Capacity | SAE 20W-50 / 4.3 Liters (4.5 US qt) |
| Front Tire | 130/70B18 63H |
| Rear Tire | 180/70B16 77H |
| Tire Pressure (F/R) | 36 PSI (2.5 bar) / 42 PSI (2.9 bar) |
| Battery Type | OEM Part 66000207 |
| Spark Plug | Harley-Davidson 60100010 |
Engineering Highlight: The Modular Chameleon
The Harley-Davidson Sport Glide (FLSB) represents a significant engineering milestone for the Softail platform. It was the first model in the lineup to utilize 43mm inverted front forks specifically tuned for performance handling, paired with a sophisticated external hydraulic preload adjustment for the rear monoshock. This allows the FLSB to transition from a stripped-down urban cruiser to a light tourer in seconds via its unique quick-detach mini-fairing and rigid pannier system.
Powertrain Analysis: The Milwaukee-Eight 107
At the heart of the FLSB is the Milwaukee-Eight 107 (1,745cc) engine. Unlike the Twin Cam predecessors, this unit features four-valve cylinder heads and dual spark plugs per cylinder, optimizing flame propagation and thermal efficiency. The engine is counter-balanced to 75% to eliminate primary vibrations while retaining the ‘visceral’ feel expected of a Big Twin. For the Sport Glide, the torque delivery is linear, peaking at approximately 145 Nm, providing ample roll-on power for highway overtaking.
Maintenance & Service Specifications
Reliability in the FLSB is contingent on strict adherence to fluid intervals. The SAE 20W-50 synthetic or semi-synthetic oil is critical for maintaining the hydraulic lifters and cooling the internal components. The 4.3L capacity ensures sufficient thermal mass for long-distance operation.
The chassis dynamics rely heavily on tire integrity. The 130/70B18 front and 180/70B16 rear combination offers a balanced contact patch. To prevent cupping and ensure cornering stability, pressures must be maintained at 36 psi (front) and 42 psi (rear).
Expert Verdict
The FLSB is a ‘Swiss Army Knife’ in the Harley-Davidson catalog. From a technical perspective, its rigid Softail frame—which hides the rear suspension to mimic a hardtail—provides a much stiffer foundation than the previous Dyna chassis, resulting in superior tracking and lean angles. It remains a top choice for riders seeking a versatile, modern V-twin with high-end suspension components.
Frequently Asked Questions
What spark plugs does the FLSB use?
The Sport Glide 107 utilizes Harley-Davidson 60100010 spark plugs, designed to handle the high compression and heat cycles of the Milwaukee-Eight engine.
What is the battery part number?
The factory replacement battery is part number 66000207, providing the high cold-cranking amps (CCA) required for the 107 CUI starter motor.