Trio the Wheel

Trio the Wheel (トリオ・ザ・ホイール) is a strange enemy in Mega Man 7, and it first appears in Turbo Man's stage and then the first three stages of Wily Castle. It is a stack of tires with an orb-like enemy in them. It shoots off tires at Mega Man, and if all are spent or destroyed, the orb will hop at Mega Man until it is also destroyed.