Just last week, we marveled at ‘Dominance,’ the jaw-dropping BMW K1100RS streetfighter cooked up by Timothy Somers and his team at Powerbrick Performance for the Bike Shed London Show. It was a masterclass in modern metric reduction, but it was only one part of a multi-bike assault on the British capital. Standing directly alongside that silver-and-red flying brick was a machine that represents an even more audacious departure from the norm. Timothy has turned his engineering crosshairs toward American iron, completely transforming a brand-new 2025 Harley-Davidson Low Rider S from a heavy-set West Coast performance cruiser into a corner-carving, supercharged cafe racer.

To say the Low Rider S is an unusual starting point for a cafe racer is a massive understatement. In its factory trim, the Low Rider S is a muscle-bound monolith. It leaves the Milwaukee assembly line packing the formidable Milwaukee-Eight 117 High Output V-twin engine, a powerplant that commands respect with 114 horsepower and a stump-pulling 128 lb-ft of torque right out of the box. Supported by selectable ride modes and a heavy breather intake, it is undeniably fast, but it is also unbreakably bound to its heavy cruiser architecture. Stripping away that inherent cruiser slouch to extract a balanced, high-tail cafe racer stance required the Dutch workshop to completely rewrite the bike's chassis geometry.

Of course, the real headline of this build is the terrifying upgrade bolted to the side of the Milwaukee-Eight motor. Powerbrick has supercharged the 117-cubic-inch V-twin via Rotrex C38 system. The team machined a full set of covers, including a cam cover, clutch cover, and a full primary cover from a solid billet aluminum block. The primary cover was engineered to house the integrated drive pulleys and oil reservoir to feed the blower. They are all equipped with polycarbonate windows to view the freshly upgraded internals. The most daunting task of the entire project was packaging the plumbing; the team had to route the pressurized intake air from the supercharger, snake it across the engine block, and pass it through an intercooler to manage intake temperatures before finally entering the upgrade 90mm throttle body on the opposite side. Equipped with a custom Raceport blow-off valve, the bike emits the distinct, sinister supercharged whistle.  While the supercharger is technically rated to support up to 300 horsepower, Timothy notes they are tuning it conservatively with a 250 horsepower target, effectively doubling the Low Rider's original output.

On almost any other custom motorcycle, the exhaust system would be considered the crowning achievement of the build, but on a machine this heavily modified, it almost plays a supporting role. The team fabricated a pair of custom stainless steel drag-pipe-style exhaust pipes that snake tightly along the right side of the engine block, terminating in a raw, aggressive exit that barks with absolute authority.

To tie the entire project together, Powerbrick draped the machine in their now-signature monochromatic silver and vibrant racing red colorway, delivering a subtle, timeless aesthetic that looks fast even when sitting perfectly still on a show stand. Alongside 'Dominance,' this supercharged beast was snapped up by a single private collector before the doors of the Bike Shed London Show even closed, proving that Timothy's radical vision for American muscle is globally undeniable.

What would you rate this build?