Sportster Roadster

2018 Harley-Davidson Sportster Roadster Technical Analysis & Specification Breakdown

At the heart of the 2018 Harley-Davidson Sportster Roadster naked motorcycle, Harley-Davidson pairs a 1202 cc (73.4 cu in) air-cooled v2, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 67 HP (48.9 kW) at 6,000 rpm while maximum torque reaches 96 Nm (70.8 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 55.7 HP per liter and a 2,000 rpm working window between peak torque (4,000 rpm) and peak power (6,000 rpm), the engine character is prioritizing low-RPM tractability, mechanical longevity and relaxed throttle response over peak redline numbers.

On the scales, the Sportster Roadster measures 259 kg (571 lbs) wet (curb), translating to a power-to-weight ratio of 0.26 HP/kg (3.87 kg per horsepower). Rider ergonomics and chassis geometry center around a 785 mm (30.9 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,505 mm (59.3 in) wheelbase engineered for balanced agility and highway composure. The 12.5-liter (3.3 US gal) fuel tank paired with a rated consumption of 5.2 L/100 km provides an estimated theoretical range of roughly 240 km (149 miles) between fill-ups.

Within MotoLibrary's Harley-Davidson archive, this model family spans 3 indexed model years from 2017 to 2019, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.