So, I run RideNow TPU tubes, and I just discovered something rattling around INSIDE MY TIRE. I thought my hub was having an issue, but upon more careful inspection, something is loose inside my tire and tube and tumbles through the tire as it rolls. I almost can't believe it. It must be some part of the valve. I can't imagine it could be anything else. But, seriously, how?! The tire is fully aired up and has been holding pressure like normal.