Harley-Davidson Sportster Forty-Eight Dark Custom - 2018 Specifications and Reviews

The 2018 Harley-Davidson Sportster Forty-Eight Dark Custom appeals to riders seeking a lightweight, minimalist cruiser with authentic chopper styling. Known for its aggressive blacked-out aesthetic, low-slung 27.3-inch seat, and nimble handling, it delivers classic Harley character in a compact, manageable package ideal for both city riding and weekend cruising.

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General information

CategoryCustom / cruiser
Year2018
ModelHarley-Davidson Sportster Forty-Eight Dark Custom

Engine and Transmission Specifications

Exhaust systemChrome, staggered shorty exhaust with dual slash-cut mufflers
Greenhouse gases120.6 CO2 g/km. (CO2 - Carbon dioxide emission)
Fuel consumption5.20 litres/100 km (19.2 km/l or 45.23 mpg)
Driveline57/38 ratio
ClutchMulti-plate with diaphragm spring in oil bath
Transmission type,final driveBelt
Gearbox6-speed
Cooling systemAir
Lubrication systemDry sump
Fuel controlDouble Overhead Cams/Twin Cam (DOHC)
Fuel systemInjection. Electronic Sequential Port Fuel Injection
Bore x Stroke88.9 x 96.8 mm (3.5 x 3.8 inches)
Compression9.7:1
Torque96.00 Nm (9.8 kgf-m or 70.8 ft.lbs) @ 3500 RPM
Power65.00 HP (47.4 kW) @ 6000 RPM
Engine detailsEvolution® engine
Engine typeV2, four-stroke
 
 

Brakes, suspension, Frame and wheels

WheelsBlack, Split 9-Spoke Cast Aluminum w/ Machined Highlights
Rear brakesSingle disc. Single-piston. Optional ABS.
Front brakesSingle disc. Dual-piston. Optional ABS.
Rear tyre150/80-B16
Front tyre130/90-B16
Rear SuspensionTwin shocks
Front SuspensionTelescopic fork
Trail135 mm (5.3 inches)
Rake (fork angle)30.0°

Physical measures and capacities

Oil capacity2.60 litres (0.17 quarts)
Fuel capacity7.90 litres (2.09 gallons)
Wheelbase1,506 mm (59.3 inches)
Ground clearance100 mm (3.9 inches)
Overall length2,159 mm (85.0 inches)
Seat height693 mm (27.3 inches) If adjustable, lowest setting.
Power/weight ratio0.2664 HP/kg
Weight incl. oil, gas, etc250.0 kg (551.2 pounds)
Dry weight244.0 kg (537.9 pounds)

Other specs

MaintenanceFind parts, fluids, filters, maintenance tools and service items on eBay
LightHigh beam, neutral, low oil pressure, turn signals, engine diagnostics, low fuel warning, low battery, security system (optional)
Instruments4-inch Speedometer mounted low and integrated into handlebar clamp electronic speedometer with odometer, time-of-day clock on odometer, dual tripmeter, LED indicator lights
StarterElectric
Color optionsVivid Black, Billet Silver, Hard Candy Hot Rod Red Flake, Hard Candy Black Gold Flake, Corona Yellow Pearl, Crushed Ice Denim

Performance Profile & Rider Fit

65 hp
Peak Power
5.8s
0-60 mph

Best For

Track10%
City65%
Cornering35%
Daily Riding55%
Touring30%
Passenger25%

Rider Profile

Best ForSuited to riders from intermediate levels up who want an easy-going, low-slung cruiser rather than a beginner-only or expert-only machine.
PurposeBuilt primarily as a stylish, stripped-down urban cruiser for short rides and boulevard cruising rather than outright speed or distance touring.
Rider FitThe very low seat height and forward-set footpegs make it approachable for shorter riders, though the low ground clearance and limited lean angle demand a relaxed, upright riding style.
CharacterA gritty, blacked-out custom cruiser with big torque off the line, a thumping air-cooled V-twin soundtrack, and classic Harley drag-style attitude.
Not Ideal ForNot a good fit for riders seeking sharp cornering ability, off-road capability, or long-distance touring comfort with a passenger.

Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.

Rider Fit Visualizer

2018 Harley-Davidson Sportster Forty-Eight Dark Custom Rider Ergonomics Assessment

Calculated in your browser only - your height/inseam are never sent to our servers.

Feet:

At 693mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with both feet flat on the 2018 Harley-Davidson Sportster Forty-Eight Dark Custom, with a cramped knee angle of around 75 degrees and an upright riding position.

Data quality: measured. Assumes about 30mm of suspension sag once seated (a typical street-bike rule of thumb - stiffer or softer suspension will vary). This is an approximation from category-typical geometry and generic body proportions, not a measurement of this specific bike or you - sit on it before you buy.

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Rider Reviews

Total comments: 1
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MotorcycleDB Review

The 2018 Harley-Davidson Sportster Forty-Eight Dark Custom motorcycle is a sleek and powerful ride that offers a unique and distinctive look. The blacked-out design of this bike gives it a bold and edgy appearance that is sure to turn heads. With its 1200cc Evolution engine, this motorcycle delivers plenty of torque and power for an exhilarating riding experience. The low-slung seat and fat tires add to the aggressive styling of the Forty-Eight, making it a standout in the Harley-Davidson lineup. The 2018 Harley-Davidson Sportster Forty-Eight Dark Custom is a great choice for riders who want a motorcycle with a strong and commanding presence. Its combination of modern design and classic Harley-Davidson heritage make it a standout in the world of custom motorcycles. Whether you're cruising through the city streets or hitting the open road, the Forty-Eight Dark Custom offers a thrilling ride that is sure to impress. With its impressive performance and eye-catching style, this motorcycle is a top choice for riders looking for a powerful and distinctive bike.
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