Provides the inner raceway for a needle roller bearing arrangement, supplying a cylindrical bore seat where a shaft mounts directly against a hardened running surface. The bore diameter is 6.0 mm, width 16.0 mm, and net mass 0.004 kg, matching the XL series proportions of the IR6X9X16-XL ring. Because it is a separate inner ring rather than a complete unit, it must be paired with a matching needle roller and cage assembly or full complement set and an outer support with the corresponding raceway. This construction allows the shaft seat to be replaced or resized independently of the rolling elements, and the cylindrical bore keeps mounting straightforward on a plain shaft without additional fitting features.