Softail Street Bob

2018 Harley-Davidson Softail Street Bob Technical Analysis & Specification Breakdown

At the heart of the 2018 Harley-Davidson Softail Street Bob custom - cruiser motorcycle, Harley-Davidson features a 1745 cc (106.5 cu in) air-cooled v2, four-stroke configuration. In factory specification, peak output is rated at 86 HP (62.8 kW) at 5,020 rpm while maximum torque reaches 145 Nm (107 lb-ft) at 3,000 rpm, transferring power to the rear wheel through a 6-speed gearbox and belt final drive. With a specific output of 49.3 HP per liter and a 2,020 rpm working window between peak torque (3,000 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 Street Bob measures 297 kg (655 lbs) wet (curb), translating to a power-to-weight ratio of 0.29 HP/kg (3.45 kg per horsepower). Rider ergonomics and chassis geometry center around a 680 mm (26.8 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,630 mm (64.2 in) wheelbase engineered for planted straight-line stability. The 13.2-liter (3.5 US gal) fuel tank paired with a rated consumption of 5.5 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 2 indexed model years from 2018 to 2019, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.