The Harley-Davidson Street Runner seems to scoff at traffic lights.

Cruiser bikes are currently enjoying what many consider their golden era. With a wide variety of makes and models, numerous engine options, and more colors than a rainbow, these two-wheelers have captured the hearts of enthusiasts worldwide. Every major bike manufacturer now offers a cruiser, yet today's models owe much to the legacy of Harley-Davidson and Indian motorcycles from the 1930s to the 1960s.

It's no surprise, then, that modern cruisers often feature classic styling reminiscent of those earlier days. Their bodywork typically wraps around a lightweight frame, making them easy to handle even for novice riders. Due to their straightforward design, cruisers are also relatively affordable compared to their larger counterparts, appealing to a broad customer base.

While this simplicity and charm attract many to cruisers, the allure can fade as the market continuously evolves with newer and more exciting options. Cruiser owners then face a choice: purchase a new model or customize their existing ride. This brings us to the Harley-Davidson Street Runner, a testament to the power of customization.

The Harley-Davidson Street Runner began life as a Street Bob, one of eight cruiser models from the iconic American brand. Known for its ease of customization, the Street Bob served as the perfect canvas for the skilled hands at Thunderbike, a renowned German custom shop with over 30 years of experience.

The Street Runner stands out with its subtle yet striking modifications. Thunderbike started by replacing the original wheels, fitting a 21-inch custom wheel at the front and a smaller, undisclosed-sized wheel at the rear. The rear section, the focal point of the build, features a 200 mm wide wheel backed by a clean swingarm and a pulley brake conversion. A steel fender hovers over it without using mudguard struts, while the license plate holder has been relocated to one side to showcase the wheel.

Up front, the modifications are equally impressive. Chrome fork tubes and a fiberglass fender enhance the aesthetic, complemented by an aftermarket headlight cover and handlebar mounted on a 1.25-inch riser with sleek turn signals. These changes lend the bike a "technoid charm," according to Thunderbike.

Both ends of the bike have been lowered, giving it an aggressive stance that exudes confidence at any traffic light. Custom covers adorn the EFI, upper fork, axle, and parts of the swingarm, adding to the bike's unique appearance. The riding position has been adjusted with a forward control kit, moving the footrests forward by 70 mm for added comfort.

Mechanically, the Street Runner retains the stock Harley powertrain, a 114ci engine delivering 94 horsepower in the 2024 Street Bob model. However, it breathes through a Dr. Jekill & Mr. Hyde exhaust system, offering a distinctive sound.

Despite not being the most extravagant Street Bob customization Thunderbike has undertaken, the Street Runner impresses with its thoughtful upgrades. The parts used, excluding the exhaust system, total 8,000 euros ($8,670), with nearly a third of that spent on the front wheel and rear fender.