An invaluable guide to 30 years of twin-cylinder BMW motorcycles. This is a repackaging of an out-of-print Osprey title (originally titled "BMW Twins Restoration Guide: All BMW Flat Twins, 1955-1985"). It provides invaluable in-depth coverage of these extremely popular BMWs. These bikes are sought out worldwide and are restored and ridden by enthusiasts who love their heritage as well as their look, sound, and feel on the road. Restorers will welcome the renewed access to the valuable information in this book. It includes coverage of the many engineering redesigns, technical modifications, and restyling exercises carried out on the horizontally-opposed twin-cylinder BMW machines over a 30-year period.