Okay my friend has a bike too, he is having trouble with the chain and tire as it is rubbing. The tire bearing was loose, which made the tire move all over. I fixed it, and it still rubs. I tired so many different things with a bunch of research. Between my bike and his, I am done figuring and playing around with things for awhile. Lol I need someone knowledgeable to see what wrong and help me out. If anyone is local in Gilbert az. Could we meet up and help get his bike fixed? I can even bring it over.