This model was introduced for the 2012 model year as Harley-Davidson’s stripped-back, bobber-influenced take on the Softail formula. The concept leaned heavily into postwar custom styling: a narrow rear end, chopped fenders, a solo riding position and a deliberately pared-down look that emphasized the engine and the classic Harley silhouette rather than chrome or bulk. In Harley-Davidson’s Softail family, it stood apart as one of the most minimalist factory cruisers, aimed at riders who wanted a traditional appearance with modern Harley hardware underneath.
The early versions were identified by the FLS Softail Slim designation and were part of the Twin Cam Softail era. Over the course of its run, the model became especially associated with the Twin Cam 103B powerplant, which gave the bike the “103” identity used in some market references and listings. Harley-Davidson kept the Slim in the lineup through the end of the 2017 model year, making it one of the final Softail models to carry that pre-2018 chassis and engine family.
For 2018, Harley-Davidson redesigned the entire Softail range around a new chassis and Milwaukee-Eight power, and the Slim returned as a revised model rather than a continuation of the original 103-era motorcycle. That means the original Softail Slim 103-era production run is best understood as a single continuous chapter from 2012 through 2017, remembered for distilling the Softail look into a lean, factory-built bobber with strong heritage appeal.