This is a cylindrical inner ring designed as a separate component for needle roller bearing assemblies without an integral inner ring. The bore diameter is 25.0 mm, width is 17.0 mm, and net mass is 27.8 g. The cylindrical outer surface of the ring provides the running surface for the needle rollers, allowing the inner ring to be mounted directly on the shaft. Using a separate inner ring like the IR25X30X17-XL allows the shaft to be hardened and ground to the required surface finish without relying on the shaft itself as the roller path, extending service life under load. It is intended for use with a matching needle roller and cage assembly or full complement needle roller bearing sharing the same bore and width dimensions, and must be paired with the correct outer ring or housing bore to complete the bearing arrangement.