A bearing system, comprising: a shaft, having a longitudinal axis about which the shaft can rotate, the shaft including a circumferential channel comprising an axially extending profile surface at least part of which is inclined relative to the longitudinal axis; a bearing, disposed around the shaft a split ring, located in the circumferential channel so as to be in contact with the inclined profile surface, the split ring including a first part having an outer diameter, and a second part having a greater outer diameter than the first part so as to provide a thrust surface; a solid, single-piece, ring-like collar, including an internal bore accommodating the first part of the split ring in use, the collar being axially located between the thrust surface and the bearing; and a bearing locator, exerting an axial locating force between the split ring and the bearing in order to locate the bearing on the shaft, wherein the bearing locator and the collar comprise separate elements, and wherein the bearing locator comprises: a threaded spacer, disposed between the bearing and the circumferential channel so as to abut the bearing; and a nut, screwed on the threaded spacer into abutment with the collar so as to exert the axial locating force; and wherein in use: the shaft produces an axial thrust load which is transmitted to the split ring in a first axial direction, such that an axial force (Fa) is applied to the thrust surface in a second axial direction, which is opposite to the first axial direction, and is in turn transmitted from the thrust surface to the collar in the first axial direction; and the split ring is urged along the inclined profile surface by the axial force (Fa) so as to produce a radial load on the split ring which is resisted by the collar, thereby to keep the bearing located on the shaft. a shaft, having a longitudinal axis about which the shaft can rotate, the shaft including a circumferential channel comprising an axially extending profile surface at least part of which is inclined relative to the longitudinal axis; a bearing, disposed around the shaft a split ring, located in the circumferential channel so as to be in contact with the inclined profile surface, the split ring including a first part having an outer diameter, and a second part having a greater outer diameter than the first part so as to provide a thrust surface; a solid, single-piece, ring-like collar, including an internal bore accommodating the first part of the split ring in use, the collar being axially located between the thrust surface and the bearing; and a bearing locator, exerting an axial locating force between the split ring and the bearing in order to locate the bearing on the shaft, wherein the bearing locator and the collar comprise separate elements, and wherein the bearing locator comprises: a threaded spacer, disposed between the bearing and the circumferential channel so as to abut the bearing; and a nut, screwed on the threaded spacer into abutment with the collar so as to exert the axial locating force; and wherein in use: the shaft produces an axial thrust load which is transmitted to the split ring in a first axial direction, such that an axial force (Fa) is applied to the thrust surface in a second axial direction, which is opposite to the first axial direction, and is in turn transmitted from the thrust surface to the collar in the first axial direction; and the split ring is urged along the inclined profile surface by the axial force (Fa) so as to produce a radial load on the split ring which is resisted by the collar, thereby to keep the bearing located on the shaft. the shaft produces an axial thrust load which is transmitted to the split ring in a first axial direction, such that an axial force (Fa) is applied to the thrust surface in a second axial direction, which is opposite to the first axial direction, and is in turn transmitted from the thrust surface to the collar in the first axial direction; and the split ring is urged along the inclined profile surface by the axial force (Fa) so as to produce a radial load on the split ring which is resisted by the collar, thereby to keep the bearing located on the shaft.