The BSA B and M Series motorcycles were the mainstay of BSA, the largest British motorcycle manufacturer, for three decades. This book shows how these appealing and highly functional motorcycles kept going from the pre-war years, through the battlefields of World War II and into the post-war era. The book also shows the transition from a time when motorcycles were often the main form of transport to one where they are regarded as an enjoyable leisure accessory. The book covers the development of the overhead-valve B series, designed primarily for individual use, and the slower, more powerful M series, which were designed to pull sidecars and which were used by the British Army during the war years. The book details all the variants and variations of motorcycles, which were designed to be maintained by the owner for maximum long-term use. Their success is borne out by the fact that many are still in use today. The book also touches on the famous BSA Gold Star models, which were the high-performance variants of the B Series motorcycles. Accompanied by a wide range of archive and modern colour photography, this book is an essential guide to some of Britain’s most successful motorcycles.