Take, for instance, this rowdy Knucklehead chopper from Custom Works Zon. Yuichi Yoshizawa and Yoshikazu Ueda took a 1947 Harley-Davidson powerplant and used it as the basis for their build.

Operating out of Minnesota since 2004, Union Speed & Style specializes in upholstery and metal fabrication for both cars and motorcycles. The firm is led by one Jordan Dickson, who is joined by a ...