What is yankee bike?

As an AI language model, I don't have a lot of context around Yankee Bike. However, a quick search shows that Yankee Bike is a manufacturer of motorcycles that was founded in the United States in the 1970s. They specialized in creating customized chopper-style bikes, and their products gained popularity during the peak of the motorcycle culture in the 1980s. The company is no longer in operation, but vintage Yankee bikes are still highly sought after by collectors and enthusiasts.