Premium Harley-Davidson Carbon Fiber Parts: Track-Tested Bagger Performance

At FatboyDesign, performance is not just a goal—it’s a proven standard built over more than thirteen years of hands-on experience in custom Harley-Davidson parts. With deep roots in vintage chopper culture and a strong passion for motorsports, our journey has naturally evolved into competitive bagger racing. Every carbon fiber component we produce is shaped by real-world track testing and precision engineering, ensuring it delivers exceptional durability, lightweight performance, and a perfect fit. Designed for riders who demand both function and aggressive style, our parts enhance the performance and presence of modern Harley touring bikes.

Built From the Ground Up

Fat Boy Design USA was not created from hype—it was built from knowledge, experience, and a commitment to doing things the right way.

What started as a shared respect for performance and craftsmanship evolved into a brand focused on delivering real value to riders. Every decision is made with intention, ensuring that each product reflects quality, precision, and long-term reliability.

COLLECTIONS

Fat Boy Design USA collections are organized by Harley platform and riding style to make it easier to find the perfect carbon fiber parts for your build. Whether you are upgrading a 24+ Touring bike, a 2015–2023 bagger, a Low Rider, or building a full custom performance machine, every collection is designed for precise fitment and effortless selection.

Built From the Ground Up

Built from the ground up by Al and Kenny, Fat Boy Design USA was created through a shared vision for performance, craftsmanship, and authenticity. What started with passion and experience became a brand committed to building with purpose—without shortcuts and without compromise.

UPGRADE YOUR BIKE ELEVATE YOUR EXPERIENCE

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The Racing Division of Fatboy Design USA & Upper Carbon

Built by Racers. Engineered for Performance.

Sport Bagger Concepts is where racing, engineering, and real-world experience come together.

This is the performance and racing division—focused on building, tuning, and delivering elite-level Harley-Davidson baggers for both the track and the street.

We don’t follow trends.

We build machines that perform.

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