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Cruisers

2021Harley-Davidson Softail Slim

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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.

Capacity: 1746.0 ccm
Engine: V-Twin, four-stroke
Gearbox: 6-speed
Dry weight: 291.0 kg
Seat height: 648 mm
Power: 86.0 HP (62.8 kW) @ 5020 RPM

⇄ Compare with another bike ＋ Add to garage All model years

What’s new for the 2021 Harley-Davidson Softail Slim

vs the 2020

Spec	2020	2021
Rear suspension	Single shock	Twin shocks

Other years 2013 2014 2015 2016 2017 2018 2019 2020 2021

How it rides

Editorial estimate from the spec sheet - not lab tested

Off-road & trail5%

Cornering30%

City riding45%

Daily riding55%

Touring55%

Two-up45%

Track10%

Best for: Built for laid-back boulevard cruising and stylish weekend rides rather than outright performance.
Built for: 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.

Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.

Will it fit you?

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Your height

Inseam (optional)

Units

At 648mm, a rider of 68.9" with a 31" (estimated) inseam will reach the ground with both feet flat on the 2021 Harley-Davidson Softail Slim, with a cramped knee angle of around 70 degrees and an upright riding position.

Assumes about 30mm of suspension sag once seated. This is an approximation from category-typical geometry, not a measurement of this bike or of you - sit on one before you buy.

More bikes at 750 mm or under — Short Kings →

Find bikes that fit your height →

Range and running costs

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Units

Currency

Fuel per litre

Riding a year

Based on the maker's published fuel consumption and tank size. Real-world figures depend on how and where you ride, and the last litres of a tank are reserve. Prices shown greyed are examples - type your own.

Full specifications

Engine

Capacity: 1746.0 ccm
Power: 86.0 HP (62.8 kW) @ 5020 RPM
CO2 Emissions: 116 CO2 g/km
Torque: 149.2 Nm (15.2 kgf-m) @ 3000 RPM
Engine type: V-Twin, four-stroke
Fuel consumption: 5.00 litres/100 km (20.0 km/l)
Power/weight ratio: 0.2955 HP/kg (dry)
Bore x stroke: 100.0 x 111.1 mm
Compression: 10.0:1
Cooling system: Air
Fuel system: Injection
Starting: Electric

Transmission

Gearbox: 6-speed
Transmission type: Manual
Final drive: Belt
Clutch: Multi-plate with diaphragm spring in oil bath

Dimensions & weight

Wheelbase: 1630 mm
Overall length: 2310 mm
Seat height: 648 mm
Dry weight: 291.0 kg
Wet weight: 304.4 kg
Fuel capacity: 18.90 litres
Ground clearance: 120 mm
Oil capacity: 4.70 litres

Chassis & suspension

Front suspension: Telescopic fork
Rear suspension: Twin shocks
Rake (fork angle): 30.0°
Trail: 147 mm

Brakes & wheels

Front brakes: Single disc. Optional ABS. 4-piston
Rear brakes: Single disc. Optional ABS. 2-piston
ABS: Optional
Front tyre: 130/90-B16
Rear tyre: 150/80-B16

Other

Color options: Vivid Black, Billiard Red, River Rock Grey Denim/Black Denim, Midnight Crimson Red/Stone Washed White Pearl

Specs last verified against published sources: October 2026.

Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.

What changed, year to year

Differences highlighted

Specification	2013	2015	2017	2019	2021
Capacity	1688 cc	1688 cc	1688 cc	1746 cc	1746 cc
Dry weight	304 kg	304 kg	308 kg	291 kg	291 kg
Seat height	605 mm	650 mm	650 mm	660 mm	648 mm
Fuel capacity	18.9 L	18.9 L	18.9 L	18.9 L	18.9 L

Illustrative - generated automatically by diffing the year records already on file, not a manufacturer-published changelog.

Rider Reviews

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MotorcycleDB

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.

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