Why do people ride motorcycles? Thomas Krens, curator of The Art of the Motorcycle, the most popular exhibition ever mounted at the Guggenheim Museum, writes: "For much of society, the motorcycle remains a forbidden indulgence, an object of fantasy, and danger." And of envy. No other machine is thought of as the vehicle"the perfect vehicle" Melissa Holbrook Pierson calls itof rebellion, lawlessness, and freedom. She's A Bad Motorcycle collects the writings of those who have sought that freedom. From the genre-definingand explodingZen and the Art of Motorcycle Maintenance to Chasing Che the...