This inner ring provides the raceway surface for a needle roller bearing operating without an integral inner ring, allowing direct mounting on a shaft while maintaining full roller support. The cylindrical bore diameter is 65.0 mm, the width measures 45.0 mm, and the component has a net mass of 0.26 kg. The XL designation indicates a reinforced ring cross-section, which supports higher radial loads on the mounting shaft compared to a standard-section ring. Being a separate inner ring, IR65X72X45-XL must be matched with a needle roller and cage assembly or a full complement needle roller bearing of the corresponding size. The ring itself carries no seals or integrated lubrication provision, so lubricant supply and sealing must be arranged through the surrounding housing design. Its cylindrical bore allows a straightforward interference or transition fit on the shaft, with the ring absorbing radial load transmission to the rollers running on its outer surface.