Truvativ: Truvativ 5D Left Hand Crank features square taper bottom bracket. Made of high quality material. Genuine and original Truvativ replacement part. Available in pitch black colour. 170 mm crank length. This is a useful spare part if your original crank loosens off and the bike is still ridden.Bottom bracket interface: Square Taper Made of high quality materialGenuine and original Truvativ replacement partAvailable in pitch black colour170 mm crank length