The hub unit bearing features a high-reliability seal that delivers superior dependability in the toughest environmental conditions. Of all the components of an automobile, the hub unit bearing is located closest to the surface of the road, and so it is exposed to muddy water easily. Despite this, it must maintain a high level of reliability due to the critical role it plays supporting the vehicle frame. The demand to reduce CO2 emissions along with rising gasoline prices have made improved fuel economy an imperative for automobiles, which means that friction must be reduced and reliability must be improved.