This adapter is used to mate a ruckus tree to a honda elite, aero 50, or spree. You WILL need to do other modifications, but your stuck without this piece. This allows the lower ruckus race to fit into your bike's neck. This is the first step to adding a disk brake to your bike. Made of hardened steel, designed for perfect fitment. Made right here in oregon. also works with zuma vertical, and yamaha jog!