Abstract: This invention embodies a side reflector assembly adapted to be mounted on the spokes of a bicycle wheel or the like, such assembly including two slim elongated bodies bonded together. Each body has a front reflective surface comprised of at least a first planar surface and a second roof-like surface having two inclined planar sections symmetrical to the longitudinal axis of the assembly. Bolt and nut means are provided for clamping the assembly onto the wheel spokes.