I just had new rubber put on the bike. As I was riding it home, I noticed a strange sound from the rear end. It had a slight vibration with the sound, but I couldn't reproduce it or pinpoint it at first. I finally noticed that it happened consistently as I was coasting to a stop. It happens every time at when I go above 30mph, and then decelerate without using the brake. At 30mph it makes a strange noise, like a rubbing, or something loose, and quickly stops. I have checked everything I know to check, it never did this before the new tires, but I don't know what would've changed. I can't figure it out at all. HELP!