Just recently I had flat tire on my rear wheel. I replaced the innter tube and put everything back. On my first ride I hear "sheesh ... sheesh ... sheesh". I stopped, lifted the rear wheel from the ground and turned it by stepping on the pedals. The brake pads are touching wheel's rim and the wheel seems going slightly from side to side. Is it possible that while fixing the flat I accidently brought the wheel out of its delicate balance? When I lift the wheel, lean the bike on one side and turn the wheel -- the "sheesh ... sheesh" sound is more pronounced.