Make it pop: GS Mashin’s Harley Fat Boy

Custom Harley Fat Boy built by Tom Mosimann of the Swiss workshop GS Mashin.
A world-famous custom builder recently told us: “I never want my Harleys to look like Harleys.” We wonder if Tom Mosimann had the same thought when he built this outlandish Harley Fat Boy.

Based in the Swiss capital of Bern, Tom is a sign painter who started building bikes three years ago under the moniker of GS Mashin. This 2000-model Fat Boy is his first Harley—you can’t miss the muscular V-twin, but it’s now clothed in most unusual swooping bodywork and a retina-searing paint job.

Custom Harley Fat Boy built by Tom Mosimann of the Swiss workshop GS Mashin.
Tom drew inspiration from old salt flat racers and drag bikes. He shaped everything himself out of steel—from the prominent headlight shroud, through to the hard-edged tank and the tail section with its integrated rear light.

The seat’s been covered in leather, and Tom’s made a neat little belly ‘spoiler.’ The exhaust system is his handiwork too, as is the angular ‘GS’-adorned air filter.

Custom Harley Fat Boy built by Tom Mosimann of the Swiss workshop GS Mashin.
Accompanying the bespoke metalwork is a bevy of choice parts. Hiding behind the headlight shroud are an Auto Meter speedo, LSL bars, Roland Sands Design grips and Beringer controls. The mid-placed foot controls and primary drive are from Performance Machine.

Custom Harley Fat Boy built by Tom Mosimann of the Swiss workshop GS Mashin.
Tom kept the Harley Fat Boy’s rear wheel and shocks, but lowered the forks and upgraded them with Progressive Suspension springs. The front wheel’s a 21-inch unit from another Harley; both wheels are running Dunlop D402 rubber.

Custom Harley Fat Boy built by Tom Mosimann of the Swiss workshop GS Mashin.
Tom wrapped the project up in nine months, finishing it off with a livery that unashamedly flaunts his skills with a paint gun. The greens used are echoed in places like the wheels, air filter cover and spoiler.

It might not be the most practical custom, but we love it. And, despite its outlandish appearance, it’s fully road legal in Switzerland—a country that has some of the most stringent noise regulations in the world.

Custom Harley Fat Boy built by Tom Mosimann of the Swiss workshop GS Mashin.
“GS Mashin only builds roadworthy bikes,” Tom explains. “Because bikes are for riding.”

Absolutely.

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Custom Harley Fat Boy built by Tom Mosimann of the Swiss workshop GS Mashin.