The type of metals used in wheel bearings can tell you a lot about their quality. You want materials, such as OE quality forged steel, that can withstand the rigors of everyday driving while enhancing overall vehicle performance. Production validation testing and pre-lubrication are also signs of quality bearings. Ultimately, you want to find parts that can meet strict tolerances and OE specifications, with a track record of excellent performance. These are among the most effective criteria for gauging quality.