Bicycle wheel rim and process for manufacturing the same

A rim for a bicycle wheel, the rim comprising a wall made of composite material having a plurality of perforated spoke-attachment seats and unidirectional structural fibers which, in areas far from the perforated seats, extend along a longitudinal direction, wherein at least one of said plurality of perforated spoke-attachment seats is at least in part delimited by:

• at least one first area comprising end portions of a first plurality of cut structural fibers;
• at least one second area circumferentially spaced apart from said at least one first area and comprising both end portions of a second plurality of cut structural fibers having a longitudinal dimension greater than a longitudinal dimension of the structural fibers of said first plurality of cut structural fibers, and first portions of continuous structural fibers;
• wherein the at least one second area comprises an area of amassment of end portions of the second plurality of cut structural fibers and of first portions of continuous structural fibers, and,
• wherein in said area of amassment at least some of the end portions of the structural fibers of said second plurality of cut structural fibers are spread apart and are in a condition of mutual juxtaposition or of mutual interposition with respect to said first portions of continuous structural fibers.