The shimano fc tx801 tourney triple chainset entry level 7 8 speed chainset compatible with hyperglide chains the shimano m171 sis triple chainset delivers precise and smooth shifting performance shimano fc tx801 tourney triple chainset features chainwheel incorporates chain pickup ridges specially developed teeth profiles and guide ramps to assure fast and precise sis shifting 7 8 speed compatible steel chainrings for use square taper bottom brackets