An ice cycle, ice bike, or icycle is a bicycle adapted for use on ice, usually by replacing the front wheel with an ice skate.[1][2][3][4][5] Versions exist with and without additional skates to provide lateral stability,[1][2] that have been based on upright and recumbent bikes,[6] and that have been used for racing.[3][6] Ice cycles have been in use since at least the 1890s,[7] and theory predicts that a bicycle with a front skate can exhibit riderless self-stability similar to the same bicycle with a front wheel.[8] At least one example has been made with both the front and the rear wheels replaced by skates.[9]
