the invention relates to a radial roller bearing , having an outer bearing ring and an inner bearing ring , and rolling bodies located between the rings . some of the rollers are formed by individual hollow rollers of a shape memory alloy . the cross - section of the shape memory alloy rollers is deformed during the assembly of the radial roller bearing to fit the dimensions of the free space between the rims of the rings . the rollers are introduced into the radial roller bearing through the free space between the rims of the bearing rings . after introduction into the radial roller bearing and once they have reached a specific temperature , the rollers independently regain their original shape .