Sprocket for a bicycle

A multi-stage sprocket assembly for a bicycle comprising first and second sprockets of different diameters for receiving a chain shifted among said sprockets to change the speed of said bicycle, a larger diameter sprocket comprising a predetermined number of spaced teeth located on and being integral with a portion of a circumferential periphery of a sprocket body, the remaining portion of said circumferential periphery being devoid of said predetermined number of spaced teeth, said sprocket body and predetermined number of spaced teeth being made of a material having a predetermined wear resistance, said portion devoid of said predetermined number of spaced teeth having connected thereto at least one toothed member which is separate from said sprocket body and made from a different material having a greater wear resistance than the material of said sprocket body and predetermined number of spaced teeth, each said tooth member having teeth with a greater wear resistance than that of said predetermined number of teeth, the spacing of the teeth of each said toothed member being the same as that of said predetermined number of teeth of said sprocket body, said tooth member including at least one tooth having a construction permitting easy engagement of a driving chain, the teeth of said toothed member being coincident with the point of engagement of said chain, said engagement point being located at a distance from the point where the chain disengages from a smaller diameter sprocket equal to an integer multiple of the chain pitch whereby the greater wear resistance teeth of said toothed member catch said chain.