A crown race rests at the base of steerer mates with bottom bearing. They offer the facility of self-centring on the bearing, and when the preload has been applied, the shape of the angle of the crown race ensures support to both lateral and axial loads. Additionally, the top race performs corresponding duties for the upper bearing. In many modern bikes, the crown race is integrated to eliminate the need for a separate race. They are machines to either 36- or 45-degree angles.