Ok class, thinking caps on please. Last two trips, and I have rolled back the Trike both times, after removing it from rear rack, I find the chain has come off the rear sprocket to the inside. Can/will the chain get dusty enough to prevent it from pivoting around sprocket? Going to remove it today to clean it guud. Going to clean tubes also. We go down a dirt road to a lot next to the local trail. I have an empty bird seed bag covering the front pedals to keep that cleaner.