I read all the reviews before buying the Echo for my parents so I was surprised they didn't fit very well and stuck around the valve stem. But since the reviews said it stayed on the bike I left it alone. About a week later I noticed that one of the caps had come loose. I pulled out the old factory cases and compared them to the new ones. I installed the metal ring upside down. I don't know why I didn't compare them when I got them but after flipping the rest of the lids over they now match perfectly. live and learn