A friction ring comprising: a plurality of segments (126, 226) configured to be affixed to a hub or an axle and arranged about the hub or axle to form a ring shaped body, wherein each of the segments comprises: a front side and a rear side, each of the front side and the rear side comprising an outer surface (128, 228) configured to be contacted by a brake mechanism and an inner surface (130, 230) configured to contact a portion of the hub or axle to impart a braking force thereto; wherein each of the segments also includes a single through-hole (158, 258) extending between the outer surface of the front side and the outer surface of the rear side of the segment for receiving a fastener for fixing the segment to the hub or axle; and at least two protrusions (135, 235) extending from the inner surface (130, 230) of the front side to the inner surface of the rear side of the segment, the at least two protrusions are radially extending fins and form a radially open channel (150, 250) therebetween, wherein, when viewed along a plane parallel to the face of the brake disc segment, a cross-sectional area of a radially inward inflow portion (152, 254) of the channel (150, 250) between the at least two protrusions is smaller than a cross-sectional area of a radially outward outflow portion (154, 252) of the channel (150, 250) between the at least two protrusions, and characterized in that at least one segment of the plurality of segments includes a plurality of transverse ribs, at least one transverse rib of the plurality of transverse ribs extends between adjacent radially extending fins, and the plurality of transverse ribs are positioned on a radially outer half of the at least one segment of the plurality of segments and arranged such that at least one radius of each segment passes through at least two transverse ribs of the plurality of transverse ribs. wherein each of the segments also includes a single through-hole (158, 258) extending between the outer surface of the front side and the outer surface of the rear side of the segment for receiving a fastener for fixing the segment to the hub or axle; and at least two protrusions (135, 235) extending from the inner surface (130, 230) of the front side to the inner surface of the rear side of the segment, the at least two protrusions are radially extending fins and form a radially open channel (150, 250) therebetween, wherein, when viewed along a plane parallel to the face of the brake disc segment, a cross-sectional area of a radially inward inflow portion (152, 254) of the channel (150, 250) between the at least two protrusions is smaller than a cross-sectional area of a radially outward outflow portion (154, 252) of the channel (150, 250) between the at least two protrusions, and characterized in that at least one segment of the plurality of segments includes a plurality of transverse ribs, at least one transverse rib of the plurality of transverse ribs extends between adjacent radially extending fins, and the plurality of transverse ribs are positioned on a radially outer half of the at least one segment of the plurality of segments and arranged such that at least one radius of each segment passes through at least two transverse ribs of the plurality of transverse ribs.