I have owned two radtrike bikes. The first had an electrical issue and needed to be exchanged. Both bikes have had all three treads stuck on one side. It's as if the bead is glued in place. I have literally cut the rest of the tread away to look at it from the inside and nothing looks out of place, like obvious glue or some kind of mechanism like a clamp or anything. I need to change the thread because it's starting to wear out, but I can't when it's stuck like this. Has anyone else had this problem or something like it? Customer service keeps telling me they'll call me back and then never do. This is my only way to get to work and I am kind of worried. Any help would be appreciated, and thanks in advance.