Mechanical transparency reigns supreme with the Confederate X132 Hellcat. The bike's chunky 2,163cc V-twin appears suspended without the visual interference of frame, while a clear polycarbonate window offers a peek at its cam belts, and a visible oil reservoir sheds further light on the engine's inner workings. It may not compete with purebred sport bikes, but Confederate's wild ride produces neck-snapping, pit-of-your-stomach responses. Or, as company founder Matt Chambers puts it, "that critical grin-inducing sensation." [$50,000; confederate.com]