AoKiji's Bicycle

Admiral Aokiji is able to use a bicycle on the sea. Aokiji uses his Devil Fruit powers, the Hie Hie no Mi, to freeze the water in front of him to form a narrow track, which he can ride on. He is able to ride his bicycle across the sea because of this.

This method of traveling was first seen when Aokiji met the Straw Hat Pirates. He was able to travel from island to island on his bicycle. Aokiji is one of the few Devil Fruit users who has adapted his powers into an efficient means of traveling the sea.