Abstract: A bicycle sprocket includes a number of annularly equidistant teeth formed on an outer periphery thereof, the teeth on the sprocket being diametrically symmetrically formed. The sprocket includes two diametrically disposed easy-to-engage teeth. The sprocket further includes two diametrically symmetrical guiding surfaces formed on an outer side thereof. Each guiding surface extends over at least two teeth and includes an end merges with an associated easy-to-engage tooth. Each easy-to-engage tooth includes a right side with a concave surface and a sloped left side when viewed from the outer side of the sprocket, thereby forming a sharp end between the right side and the left side. One of the teeth covered by each guiding surface and most adjacent to an associated easy-to-engage tooth has a height lower than that of the remaining teeth on the sprocket and has a second concave surface on a right side thereof for engaging with one of a number of roller pins of a chain to be engaged with the sprocket.