LR2042RSR Track Roller LR2042RSR, 20mm ID, 52mm. INA from Schaeffler bearings have a cylindrical outer ring and are fitted in cylindrical bores. The inner ring is extended on both sides and is on the shaft using a location fit. Due to the extended inner ring, extra axial spacer rings are not required. The concentric seat allows for speeds equivalent to standard ball bearings, while the load can be either constant or alternating. Smooth running is also achieved.