| Feature | Specification |
|---|---|
| Model | Freewheeler (107 CUI) – FLRT |
| Production Years | 2017–2018 |
| Engine Type | Milwaukee-Eight 107 V-Twin |
| Oil Type & Capacity | 20W50 (3.8 Liters) |
| Front Tire | MT90B16 72H (2.5 bar / 36 psi) |
| Rear Tires | P205/65R15 92T (1.8 bar / 26 psi) |
| Battery Part No. | 66000175 |
| Spark Plug | 10R12A |
The Engineering Pivot: The Milwaukee-Eight Integration
While the Freewheeler (FLRT) debuted in 2015, the 2017 model year represents a significant engineering milestone: the introduction of the Milwaukee-Eight 107 engine. Unlike its Twin Cam predecessor, the 107 CUI powerplant utilized a four-valve per cylinder head design and a dual-spark configuration, which specifically addressed the thermal management challenges inherent in three-wheeled chassis. By improving exhaust heat flow and increasing torque by 10% over the previous generation, Harley-Davidson transformed the FLRT from a cruiser-trike into a high-performance touring machine.
Performance Dynamics & Chassis Handling
The FLRT is built on a unique chassis designed to handle the lateral forces of a non-leaning vehicle. The front end features 49mm telescopic forks with a steering damper to mitigate high-speed oscillations. The Milwaukee-Eight 107 provides the necessary low-end grunt to propel the 492kg (wet weight) machine, delivering peak torque early in the RPM range. Maintenance of the steering head bearings and the rear differential are paramount to ensuring the stability of the trike configuration.
Maintenance Protocol: MotoSpecsLab Official Guide
Lubrication System
The 107 CUI engine requires high-viscosity 20W50 oil. For optimal performance under the higher thermal loads of a trike, MotoSpecsLab recommends synthetic fluids. The system capacity is 3.8 Liters. Check levels every 1,000 miles, as the Milwaukee-Eight is known for a ‘settling’ period during the first few thousand miles of operation.
Tire and Contact Patch Optimization
Unlike two-wheeled motorcycles, the Freewheeler utilizes automotive-style rear tires. Maintaining correct pressure is critical for traction and tread life. The front MT90B16 requires 36 psi (2.5 bar) to maintain steering precision, while the rear P205/65R15 tires should be kept at 26 psi (1.8 bar) to ensure a flat contact patch across the tread.
Electrical and Ignition
The FLRT utilizes the high-output 66000175 battery to support the electronic fuel injection and security systems. For ignition, the 10R12A spark plugs are specifically gapped to handle the dual-plug timing of the Milwaukee-Eight head. Plugs should be inspected for carbon fouling every 5,000 miles.
Expert Verdict
The 2017–2018 Freewheeler FLRT remains a pinnacle of trike engineering. By pairing the stripped-down ‘hot rod’ aesthetic with the refined Milwaukee-Eight 107 engine, Harley-Davidson created a vehicle that offers both mechanical reliability and visceral performance. Following the specified maintenance intervals for fluids and tire pressures is essential for preserving the vehicle’s unique handling characteristics.