Round floor roller bearings have two very important mechanical characteristics, which are high ability to withstand axial loads due to the shape and cross-sectional area of the bullets and a much higher contact surface than round floor bearings with cone and rim surface, and second low rolling capabilities Round floor at high angular velocities means that with increasing angular velocity, the possibility of deviation from the shaft axis connected to the roller bearing is higher and these thrust roller bearings are not very ready to change the connection angle. Of course, in most cases, due to the high weight applied by the shaft connections, a very high angular velocity does not occur in the car dynamics due to the high weight applied by the shaft connections.