At HowlingJack.com, we’re always on the lookout for custom builds that push the boundaries of what a Harley-Davidson can be. This time, we’re diving into a collection of five remarkable machines that have recently grabbed our attention, each with its own unique theme and extensive modifications.

One of the most striking is a Harley-Davidson Sportster dubbed “Opium.” Crafted with a female rider in mind, this build features an abundance of handmade leather accessories. Its distinctive “rotten green” paint job is a direct nod to the drug that inspired its name. Beyond aesthetics, the Opium boasts a lowered suspension, new handlebars, and updated hand and foot controls. The engine itself received performance boosts with upgraded intake and exhaust components from Nine Hills.

The Opium also showcases custom wheels, though their exact size remains undisclosed. These larger-than-stock wheels are integrated with an air suspension system, allowing for adjustable ride height. Nine Hills, the creator of this build, is known for sourcing their wheels rather than manufacturing them in-house.

Another standout is a custom Fat Boy that commands attention with its blood-red, flake-infused paint. This vibrant finish perfectly complements the bike’s new silhouette, achieved through a combination of new wheels – a massive 23-inch up front and a 21-inch in the rear – a single-sided swingarm, and a suite of revised bodywork. This particular Fat Boy sits lower than its stock counterpart and features higher handlebars mounted on risers, tailored to the specifications of its reportedly “giant” and anonymous owner. The total cost for the extensive modifications, excluding labor and the base motorcycle, reached an impressive $26,300.

This Fat Boy build is part of Thunderbike’s impressive GP range. It’s equipped with a braking system that’s double the size of the original, and its fenders have been enlarged to accommodate the significantly bigger wheels. A modified air suspension system, working in tandem with the single-sided swingarm, further enhances its unique stance.

The list of enhancements on this particular Fat Boy includes custom steel front and fiberglass rear fenders, an aluminum fuel tank, and replacement wheels (which are separate from the $26,300 figure). A new headlight cap, ignition covers, clutch covers, and airbox covers also contribute to its refined look. Complementing the mechanical upgrades are satin grips and footpegs.

This Fat Boy also boasts a custom saddle and handlebars, along with a selection of Rebuffini components. A 2-in-1 Bassani exhaust system adds to its performance and auditory appeal. The paint scheme on this machine is a testament to its design motif, featuring a gloss and matte finish that beautifully unifies the overall aesthetic, especially in coordination with its custom wheels.