a roller bearing comprising an inner and outer raceway and a row of rollers arranged between and contacting the raceways , the axes of the rollers being substantially parallel to the axes of the raceways when the latter are coinciding , the rollers and the raceways having curved longitudinal section profiles in which the curve radii are substantially greater than the greatest distance between the central axis of the bearing and the surfaces of the raceways and wherein the rollers are axially movable between the raceways without being obstructed by axial limitations at the raceways or by limited axial cage play for permitting relative inclination and axial displaceability being limited only by the rollers being squeezed radially between the raceways .