A bicycle wheel rim adapted for mounting a plurality of spokes thereon includes spaced left and right tire retaining walls, an annular spoke mounting wall, an annular connecting wall, and left and right reinforcing walls. The spoke mounting wall interconnects inner edges of the tire retaining walls, and has a central spoke fastening portion formed with spoke fastening holes. The connecting wall is disposed around the spoke mounting wall, and interconnects intermediate portions of the tire retaining walls. The left reinforcing wall has a first end connected to a left terminating edge of the connecting wall and the intermediate portion of the left tire retaining wall, and a second end connected to the central spoke fastening portion of the spoke mounting wall. The left reinforcing wall is inclined with respect to the left tire retaining wall. The right reinforcing wall has a first end connected to a right terminating edge of the connecting wall and the intermediate portion of the right tire retaining wall, and a second end connected to the central spoke fastening portion of the spoke mounting wall. The right reinforcing wall is inclined with respect to the right tire retaining wall.