This inner ring provides the cylindrical bore raceway for a needle roller bearing arrangement, designed as a separate component to be mounted on the shaft. It has a bore diameter of 55.0 mm, a width of 28.0 mm, and a net mass of 0.198 kg, matching the corresponding outer bearing assembly for a complete radial support system. Using a separate inner ring of this type allows the raceway surface to be hardened and ground independently of the shaft, which does not need to meet the same surface hardness requirements when a full-complement or caged needle assembly runs directly against it. This construction is suited for applications requiring a defined radial internal clearance and precise fit between the ring and shaft, with lubrication and sealing arrangements selected separately according to the surrounding bearing design.