The BMW R nineT K21, introduced in 2014, is a distinctive motorcycle that blends classic heritage styling with modern engineering. As a roadster, it embodies a commitment to purism and customization, offering a unique platform for riders seeking both performance and personal expression. At its heart lies a powerful 1170 cc air-cooled flat-twin boxer engine, renowned for its robust torque delivery and engaging character, producing 110 horsepower and 86 lb-ft of torque. This motorcycle features a steel tube frame, a 6-speed gearbox, and shaft drive, all contributing to its reliable and enjoyable riding experience. Its design philosophy emphasizes clean lines and modularity, making it a popular choice for personalization. This comprehensive factory service manual provides detailed guidance for the complete service and repair of the BMW R nineT. It covers all essential systems, including the engine, powertrain, chassis, electrical components, and bodywork, with specific sections dedicated to maintenance procedures, troubleshooting, diagnostics, and technical specifications. From routine tasks like oil changes and brake fluid replacement to more complex engine overhauls and electrical system repairs, this manual offers factory-level detail, including precise torque values and step-by-step instructions. It is an indispensable resource for owners, technicians, and mechanics aiming to maintain, troubleshoot, and repair this iconic motorcycle effectively and efficiently.