The adapter plate is necessary to attach the EVO tank ring for STREET-RACK. EVO tank ring and the adapter plate are also available as a set. Whether on the streets or off-road: with the EVO tank ring for the STREET-RACK, EVO tank bags can be quickly and securely attached to the tail. The EVO tank ring is attached to the adapter plate using four screws and makes it possible to snap on EVO tank bags with level bottoms. | Article: SW-Motech EVO Tank ring for STREET-RACK - For EVO tank bag. Black. Without adapter plate. | Article: SW-Motech EVO Tank ring for STREET-RACK - For EVO tank bag. Black. Without adapter plate., black, Size One Size