A bicycle wheel rim includes an annular rim body having a rim axis and including left and right annular side walls, two annular first oblique walls, two annular second oblique walls, an annular base wall that interconnects the second oblique walls, and left and right annular connecting walls. Each first oblique wall extends from a respective side wall and has an edge opposite to the respective side wall. The edges of the first oblique walls are disposed on an imaginary cylindrical plane. Each second oblique wall extends from a respective first oblique wall. Each connecting wall extends from the base wall to a respective side wall. Each first oblique wall has a radial inner side forming an angle with the imaginary cylindrical plane that ranges from 15 to 65 degrees.