14 August. Friday 2026
Harley-Davidson Softail Slim - 2021 Specifications and Reviews
The 2021 Harley-Davidson Softail Slim is a classic cruiser built for riders seeking authentic retro styling with modern performance. Powered by the 1746cc Milwaukee-Eight 107 engine delivering 86 horsepower and strong low-end torque, it excels at relaxed highway cruising and customization. Known for its minimalist design, comfortable riding position, and legendary Harley heritage, it appeals to traditionalists who value character over speed.
General information | |
| Price as new | 3.8 See the detailed rating of design and look, maintenance cost, engine performance, etc. Compare with any other bike. |
| Category | Custom / cruiser |
| Year | 2021 |
| Model | Harley-Davidson Softail Slim |
Engine and Transmission Specifications | |
| Exhaust system | 2-into-2 shotgun; catalyst in muffler |
| Greenhouse gases | 116.0 CO2 g/km. (CO2 - Carbon dioxide emission) |
| Fuel consumption | 5.00 litres/100 km (20.0 km/l or 47.04 mpg) |
| Driveline | Chain 34/46 ratio primary drive |
| Clutch | Multi-plate with diaphragm spring in oil bath |
| Transmission type | Belt (final drive) |
| Gearbox | 6-speed |
| Cooling system | Air |
| Fuel control | Double Overhead Cams/Twin Cam (DOHC) |
| Fuel system | Injection. Electronic Sequential Port Fuel Injection (ESPFI) |
| Bore x Stroke | 100.0 x 111.1 mm (3.9 x 4.4 inches) |
| Compression | 10.0:1 |
| Torque | 149.2 Nm (15.2 kgf-m or 110.0 ft.lbs) @ 3000 RPM |
| Power | 86.0 HP (62.8 kW) @ 5020 RPM |
| Engine details | Milwaukee-Eight® 107 |
| Engine type | V2, four-stroke |
| Capacity: | 1746.0 ccm (106.54 cubic inches) |
| | |
Brakes, suspension, Frame and wheels | |
| Wheels | Gloss Black, Steel Laced |
| Rear brakes | Single disc. Optional ABS. 2-piston |
| Front brakes | Single disc. Optional ABS. 4-piston |
| Rear tire | 150/80-B16 |
| Front tire | 130/90-B16 |
| Rear Suspension | Twin shocks |
| Front Suspension | Telescopic fork |
| Trail | 147 mm (5.8 inches) |
| Rake (fork angle) | 30.0° |
| | |
Physical measures and capacities | |
| Oil capacity | 4.70 litres (4.97 US quarts) |
| Fuel capacity | 18.90 litres (4.99 US gallons) |
| Wheelbase | 1630 mm (64.2 inches) |
| Ground clearance | 120 mm (4.7 inches) |
| Overall length | 2310 mm (90.9 inches) |
| Seat height | 648 mm (25.5 inches) If adjustable, lowest setting. |
| Power/weight ratio | 0.2955 HP/kg |
| Weight incl. oil, gas, etc | 304.4 kg (671.0 pounds) |
| Dry weight | 291.0 kg (641.5 pounds) |
Other specs | |
| Maintenance | Find parts, fluids, filters, maintenance tools and service items on eBay |
| Light | High beam, neutral, low oil pressure, turn signals, engine diagnostics, security system (optional), 6-speed, low fuel warnings |
| Instruments | 5-inch analog speedometer with digital gear, odometer, fuel level, clock, trip, range and tachometer indication |
| Starter | Electric |
| Color options | Vivid Black, Billiard Red, River Rock Grey Denim/Black Denim, Midnight Crimson Red/Stone Washed White Pearl |
Performance Profile & Rider Fit
86 hp
Peak Power
5.2s
0-60 mph
Best For
Track10%
City45%
Cornering30%
Daily Riding55%
Touring55%
Passenger45%
Rider Profile
| Best For | Suits riders from newer intermediate to experienced who want a classic heavyweight cruiser rather than a beginner's first bike. |
| Purpose | Built for laid-back boulevard cruising and stylish weekend rides rather than outright performance. |
| Rider Fit | Low 648mm seat height makes it approachable for shorter riders, but nearly 305kg wet weight demands confident low-speed handling and strength when maneuvering it off the kickstand or in tight parking. |
| Character | A stripped-down, minimalist Softail with bobber styling, deep torque from the Milwaukee-Eight V-twin, and relaxed, low-slung ergonomics that reward smooth, unhurried riding. |
| Not Ideal For | Not for riders seeking sharp cornering agility, off-road capability, or a light, flickable machine for tight technical roads. |
Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.
Rider Reviews
Total comments: 1
MotorcycleDB Review
The 2021 Harley-Davidson Softail Slim is a classic and stylish motorcycle that offers a smooth and comfortable ride. With its blacked-out appearance and vintage-inspired design, it exudes old-school charm while still delivering modern performance and technology. The compact and lightweight frame of the Softail Slim makes it easy to handle, while the powerful Milwaukee-Eight 107 engine provides plenty of torque for an exhilarating riding experience. Whether you're cruising down the open road or navigating through city streets, the Softail Slim delivers a reliable and enjoyable ride. If you're in the market for a timeless and reliable motorcycle, the 2021 Harley-Davidson Softail Slim is a top contender. Its sleek design and impressive performance make it a versatile option for riders of all experience levels. With its smooth handling and powerful engine, the Softail Slim delivers a satisfying ride every time. Whether you're a seasoned rider or just getting started, the Softail Slim is a solid choice for anyone looking for a stylish and dependable motorcycle.Add a Comment
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