Instructions: Place the round pocket of the cover over the large chain ring with the print side facing out and the square end covering the drive train and derailer. Put the pedal through the pedal slot now if you are not taking the them off. The two strips of Velcro at the top should wrap over the drive train and chain stay (frame) and connect with the other strips of Velcro at the bottom, make it however tight it needs to be to stay on. The cover will fold over a bit. Then pull the rear flap and two velcro straps around the derailer to cover it and form a pocket. The velcro straps will attach to the forward flaps, where there is a soft velcro pad. This should completely cover your drive train to prevent oil from rubbing off on your bike bag or wherever you have your bike stored.