SW-Motech ION tank ringION Tank ring The ION tank ring for the Harley Davidson Sportster S. The ION tank ring, made from fiberglass reinforced polyamide, provides a secure hold for tank bags in the ION series. The ION tank bag is mounted and locked in place with a single click. The quick release fastener is then unlocked using the pull strap. The bike specific design of these tank rings guarantees easy mounting and a secure fit, even for off road riding. Only for ION tank