Bike, Scooter, and Chopper Projects for the Evil Genius by Brad Graham and Kathy McGowan is a hands-on DIY guide for transforming standard bicycles and discarded parts into custom, high-attitude vehicles. It focuses on "chopping" (modifying frames) and building unique rides like electric scooters, recumbent trikes, and tall bikes using basic tools and a pragmatic "garage hacker" approach. Key Projects Featured in the Book
Every garage has one: a dusty bicycle frame, a rusted scooter missing its fairings, or a pile of orphaned motorcycle parts that "might be useful someday." For the average person, these are junk. For the curious tinkerer, they are questions. But for the Evil Genius—the one who sees a 49cc engine where a pedal crank should be, or a stretched chopper frame lurking inside a child’s minibike—these are answers waiting to be built. Bike- Scooter- and Chopper Projects for the Evil Genius.pdf
Unlike polished manufacturer manuals, this book embraces the "mad scientist" ethos. It assumes you have basic tools (welder, grinder, drill press) and a willingness to fail spectacularly before succeeding. The PDF version has become especially popular because makers can zoom in on welding diagrams, print templates directly, and keep a digital copy smudge-free on a tablet next to the bench grinder. Bike, Scooter, and Chopper Projects for the Evil
A major feature of the book is that it teaches fundamental engineering and metalworking skills through the projects. Calculate desired final drive ratio and pick sprocket