This manual covers the R1150RT motorcycle, a distinguished model in the touring and sport-touring lineage, produced approximately from 2001 to 2006. Building on the heritage of its predecessors, the R1150RT is characterized by its air/oil-cooled, boxer-twin engine, a 6-speed manual transmission, and shaft drive, offering a robust platform for long-distance travel. Notable features include an electrically adjustable windscreen for rider comfort, the advanced Integral ABS for enhanced braking safety, and optional heated grips and seats, reflecting its premium touring intent. Manufactured in Berlin, Germany, this motorcycle is recognized for its quality engineering and reliable performance, making it a popular choice for riders seeking comfort and capability on extended journeys. This comprehensive service manual provides essential information for the maintenance, diagnosis, and repair of the R1150RT. It details crucial procedures, including pre-delivery checks, routine maintenance schedules, and specific service data for various systems. Key areas covered include the fuel tank and lines, operating fluids, brakes with an emphasis on the Integral ABS system, and torque specifications for proper assembly. With 96 pages of detailed, step-by-step instructions and numerous pictures and diagrams, this English-language manual is designed to assist both R1150RT owners undertaking DIY tasks and independent motorcycle repair shops. Its professional-level content ensures accurate and efficient upkeep, empowering users to maintain their vehicle's performance and longevity.