Sensor bearing unit and method of manufacturing such a sensor bearing unit

A sensor bearing unit comprising:

• a bearing comprising a first ring and a second ring centered on an axis, each of the first and second rings being provided with an outer cylindrical surface, with an inner cylindrical surface, and with lateral surfaces which axially delimit the outer and inner cylindrical surfaces, and
• an impulse ring provided with a target holder and with a target mounted on the target holder, the target holder being axially mounted against one of said lateral surfaces of the first ring, and comprising a fixing portion secured to the first ring and coming into radial contact with one of the inner and outer cylindrical surfaces of the first ring and an abutment portion coming into axial contact with said lateral surface of the first ring,
• characterized in that at least one of the lateral and cylindrical surfaces of the first ring is provided with a textured area comprising a plurality of ribs spaced apart in the circumferential direction and with a plurality of grooves, each groove being located between two successive ribs, and in that the abutment portion and/or the fixing portion of the target holder is made of a hard material and comprise a soft coating covering the hard material and the ribs of the first ring are engaged at least partially inside the soft coating, or vice versa.