This track roller guides linear or curved motion along a track through direct contact of its thick-walled outer ring with the mating surface. The design is a single row self-retaining ball bearing with a ball and cage assembly, an inner ring, and axial guidance of the outer ring provided by the balls themselves. Bore diameter is 45.0 mm, outside diameter 90.0 mm, height 19.0 mm, and net mass 0.48 kg. Sealing is provided on both sides by lip seals combining axial and radial sealing action, marked 2RS, which keeps contaminants out of the raceway during rolling contact with the track surface. The thick-walled outer ring allows the roller to carry the running loads directly on its outer surface without a separate track ring, and the self-retaining ball and cage assembly with the inner ring simplifies mounting and handling as a complete unit.