rail assembly and or carriage assembly and define load bearing tracks with rolling elements therebetween the flexible rail and carriage assemblies permit optimization of the contact angle between the load bearing inserts and the rolling elements when the linear motion bearing assembly is under load application_number US 22560594 A description referring now to the drawings in detail and initially to fig1 and 2 a fully assembled linear motion bearing assembly 20 in accordance with the present invention is shown the assembly includes an inverted substantially u shaped bearing carriage 22 configured and dimensioned to move along a rail assembly 24 on rolling elements 25 although shown here as balls other rolling elements are also contemplated including rollers end caps 26 are positioned on each longitudinal end of the bearing carriage 22 the end caps 26 include semi torridal turnarounds 29 integrally formed in each of the end caps 26 and serve to enclose and connect corresponding load bearing and return tracks 28 and 30 respectively located in depending legs 32 of the bearing carriage 22 as best seen in fig2 return tracks 30 comprise parallel longitudinal bores drilled axially through the depending legs 32 of the bearing carriage 22 mounting holes 34 are formed in the upper planar surface of the bearing carriage 22 and facilitate engagement of the bearing assembly to desired machinery components longitudinal mounting bores 36 are formed in each longitudinal end face of the bearing.