[ddsmith]

Hey I know another answer. The black rim is referred to as a split rim although it does not sport the traditional split in it. It is actually slightly oval shaped but not enough to be noticeable. The ring is spun about 90 degrees to allow it to be removed. At least that is what the poor guy told me that did my tires. It took him three hours to get two tires on. He wasn't very happy. I wasn't very happy when the tube started to leak. I replaced my wheels with tubeless rims and can say I'm glad I did.