More problem w/ my car... . Now my rim is leaking air. its a 2 piece rim and air is leaking from where the 2 piece meet. The tire shop told me something about silicon moves whiles they put 2 piece together. Anyone know how and where can fix that? I am in S. Cal. Another problem is my steering wheels shakes a lot while i am driving over 70mph. what can possiblely cause this?