for those intrigued by the thrill of motorcycles and the art of evading the conventional, i recommend "the covert cycles: on the sly designs and preexpansion strategies". this book takes you on a journey back to the start of motorcycle culture, exploring the secretive designs and innovative expansions before they became mainstream. its comprehensive exploration of on-the-sly engineering marvels will captivate anyone looking to understand the depths of motorcycle design and its evasive history.