Softail Fat Bob Dark Custom

2018 Harley-Davidson Softail Fat Bob Dark Custom Technical Analysis & Specification Breakdown

Positioned in Harley-Davidson's custom - cruiser motorcycle lineup, the 2018 Harley-Davidson Softail Fat Bob Dark Custom pairs a 1690 cc (103.1 cu in) air-cooled v2, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 80 HP (58.4 kW) at 5,020 rpm while maximum torque reaches 135 Nm (99.6 lb-ft) at 3,750 rpm, transferring power to the rear wheel through a 6-speed gearbox and belt final drive. With a specific output of 47.3 HP per liter and a 1,270 rpm working window between peak torque (3,750 rpm) and peak power (5,020 rpm), the engine character is prioritizing low-RPM tractability, mechanical longevity and relaxed throttle response over peak redline numbers.

On the scales, the Softail Fat Bob Dark Custom measures 320 kg (705 lbs) wet (curb), translating to a power-to-weight ratio of 0.25 HP/kg (4 kg per horsepower). Rider ergonomics and chassis geometry center around a 590 mm (23.2 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,690 mm (66.5 in) wheelbase engineered for planted straight-line stability. The 18.9-liter (5 US gal) fuel tank paired with a rated consumption of 5.6 L/100 km provides an estimated theoretical range of roughly 338 km (210 miles) between fill-ups.