VEXpro Mecanum Wheels - VEXpro 217-3645, These mecanum wheels from VEXpro enable savvy robot designers to create drivetrains capable of moving in any direction while using a standard chassis shape. Simply power each wheel with a different motor and change the directions the wheels spin to get your robot to move in different directions.Mecanum wheel assembly hardware is separate from sprocket mounting hardware. Sprockets are screwed into captive 8-32 standoffs allowing for easy removal and replacement of sprockets without disassembling the entire wheel - so you don\'t need to worry about the whole wheel falling apart just because you want to remove a sprocket.The construction method allows for a constant contact patch with a narrow profile. Each roller is tailored for the individual wheel diameter, and provides the correct, constant radius. These wheels aren\'t \"almost round\" - they\'re actually round! This smooth ride provides higher efficiency and reduces wasted power. This is especially important in mecanum drivetrains to provide smooth holonomic motion without high motor current draw. VEXpro 217-3645 4\" Mecanum Wheel Left