Harley-Davidson Softail Slim (2018–2020): A Timeless Cruiser with Modern Muscle

The Harley-Davidson Softail Slim is a motorcycle that bridges eras. It’s a machine that nods to post-war bobber aesthetics while delivering the refined performance of modern engineering. Designed for riders who crave minimalist styling without compromising on power, the 2018–2020 generation of the Softail Slim stands out as a quintessential cruiser. Having spent time with this bike, I can confidently say it’s a love letter to purists – but one that’s been edited for contemporary sensibilities.

Design: Retro Roots, Modern Execution

The Softail Slim’s design is a masterclass in balancing nostalgia and innovation. The steel-laced 16-inch wheels, trimmed fenders, and solo seat immediately evoke the stripped-down simplicity of 1950s custom bikes. Harley’s designers leaned heavily into the “less is more” philosophy here, deleting unnecessary trim and focusing on clean lines. The teardrop fuel tank (18.9 liters / 4.99 gallons) sits low, complementing the bike’s horizontal profile.

Color options varied by year, with Industrial Gray Denim (2018) and Rugged Gold Denim (2020) being particularly striking. The blacked-out engine and exhaust system keep the focus on raw machinery, though the 2-into-2 shotgun pipes add a touch of chrome nostalgia. At 2310 mm (90.9 inches) long with a 1630 mm (64.2-inch) wheelbase, the Slim feels substantial but never bloated.

Standout details:
- LED lighting (unexpectedly modern for a retro bike)
- Tank-mounted speedometer with gear indicator and fuel countdown
- Mid-mounted controls that encourage a relaxed riding posture

Performance: Milwaukee-Eight Muscle Meets Refinement

The star of the show is the Milwaukee-Eight 107 engine – a 1745cc (106.5 cubic inches) air-cooled V-twin that produces 86 HP (64 kW) and up to 149.2 Nm (110 ft.lbs) of torque in later models. While horsepower figures might seem modest compared to sport bikes, the torque curve tells the real story. From the moment you twist the throttle, the Slim pushes forward with the urgency of a freight train, peaking at 3000 RPM.

Riding Impressions:

• Low-end grunt: The engine’s character is best enjoyed between 2000–4000 RPM. It’ll pull cleanly from 1500 RPM in sixth gear, making highway cruising effortless.
• Exhaust note: The 2-into-2 pipes deliver a deep, syncopated rumble that’s loud enough to satisfy without crossing into obnoxious territory.
• Fuel efficiency: Averaging 5.0–5.5 L/100 km (42–47 mpg), the Slim can cover about 350 km (217 miles) per tank.

The 6-speed transmission shifts smoothly, though the clutch requires a firm pull in stop-and-go traffic. The belt final drive is virtually maintenance-free, a welcome feature for riders who’d rather ride than wrench.

Handling: Surprisingly Nimble for a 304 kg (670 lb) Machine

Don’t let the cruiser label fool you – the Softail Slim handles with unexpected agility. The 30-degree rake and 147 mm (5.8-inch) trail strike a balance between stability and responsiveness. At low speeds, the 660 mm (26-inch) seat height inspires confidence, letting riders plant both feet firmly.

Key handling notes:
- Front suspension: 49 mm telescopic forks handle bumps competently, though rough roads can feel harsh
- Rear suspension: Twin shocks (2018–2019) transitioned to a single shock in 2020, improving compliance without sacrificing the “hardtail” look
- Brakes: Optional ABS works seamlessly. The single 300 mm front disc provides adequate stopping power, though spirited riders might crave dual discs

At highway speeds, the Slim tracks straight with minimal buffeting. The 130/90-16 front and 150/80-16 rear tires offer ample grip for aggressive cornering – within the limits of footpeg clearance.

Comfort: All-Day Riding with Caveats

Harley nailed the ergonomics for riders under 183 cm (6 feet). The mid-controls and drag-style bars create a natural upright posture, while the deeply padded seat (660 mm/26-inch height) supports longer rides. However:
- Passenger accommodation: The pillion pad is token at best – plan solo journeys
- Vibration: The Milwaukee-Eight engine is smoother than older Harleys, but mirrors still blur at certain RPMs
- Wind protection: Minimal. Aftermarket screens are a must for frequent highway use

Competition: How the Slim Stacks Up

1. Indian Scout Bobber

• Pros: Lighter (251 kg/553 lb), liquid-cooled engine, superior lean angle
• Cons: Less torque (97 Nm/72 ft.lbs), lacks Harley’s brand cachet

2. Honda Shadow Phantom

• Pros: Affordable, shaft drive, ultra-reliable
• Cons: Outdated air-cooled 745cc engine, basic instrumentation

3. Yamaha Bolt R-Spec

• Pros: Agile chassis, fuel injection, 950cc V-twin
• Cons: Smaller displacement, less customizable

Softail Slim’s Edge: No competitor matches its combination of classic styling, low-end torque, and aftermarket support. It’s a bike that feels special in a way metric cruisers often don’t.

Maintenance: Keeping Your Slim in Prime Shape

As a MOTOPARTS.store journalist, I’ve seen how proper maintenance extends the life of these machines. Key considerations:

1. Oil Changes

• Frequency: Every 8000 km (5000 miles)
• Oil type: SAE 20W-50 (4.75 liters/5.02 quarts with filter)
• Pro tip: Upgrade to synthetic for better heat management

2. Belt Drive Care

• Inspect every 16,000 km (10,000 miles) for cracks
• Clean with mild soap; avoid petroleum-based products

3. Brake System

• Fluid: DOT 4, replace every 2 years
• Pads: Organic compounds work well for street use

4. Valve Adjustments

• Good news: Hydraulic lifters eliminate manual adjustments

5. Winter Storage

• Stabilize fuel, disconnect battery, lift tires off concrete

Common Upgrades at MOTOPARTS.store:
- Performance air filters (+5–7% torque)
- LED auxiliary lighting kits
- Progressive suspension springs
- Extended reach seat options

Final Thoughts: Who Should Ride the Softail Slim?

The 2018–2020 Softail Slim isn’t for everyone – and that’s its greatest strength. It’s a motorcycle for riders who:
- Cherish old-school style but want modern reliability
- Prioritize torque over top speed
- Enjoy personalizing their bike (the aftermarket is vast)

While not the lightest or most technologically advanced cruiser, the Slim excels at delivering an authentic Harley-Davidson experience. It’s a bike that turns parking lots into showrooms and mundane commutes into occasions. Whether you’re a seasoned rider or someone stepping up from smaller displacements, the Slim rewards those who appreciate mechanical character over sterile perfection.

The Harley-Davidson Softail Slim (2018–2020) – where heritage meets horsepower, and every ride feels like a statement.

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