Street Rod Dark Custom

2018 Harley-Davidson Street Rod Dark Custom Technical Analysis & Specification Breakdown

Engineered by Harley-Davidson for the custom - cruiser motorcycle segment, the 2018 Harley-Davidson Street Rod Dark Custom relies on a 749 cc (45.7 cu in) liquid-cooled v2, four-stroke powerplant. In factory specification, peak output is rated at 70 HP (51.1 kW) at 9,000 rpm while maximum torque reaches 65 Nm (47.9 lb-ft) at 4,000 rpm, transferring power to the rear wheel through a 6-speed gearbox and belt final drive. With a specific output of 93.5 HP per liter and a 5,000 rpm working window between peak torque (4,000 rpm) and peak power (9,000 rpm), the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.

On the scales, the Street Rod Dark Custom measures 238 kg (525 lbs) wet (curb), translating to a power-to-weight ratio of 0.29 HP/kg (3.4 kg per horsepower). Rider ergonomics and chassis geometry center around a 765 mm (30.1 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,510 mm (59.4 in) wheelbase engineered for balanced agility and highway composure. The 13.2-liter (3.5 US gal) fuel tank paired with a rated consumption of 4.5 L/100 km provides an estimated theoretical range of roughly 293 km (182 miles) between fill-ups.