my steering wheel vibrates when I get over 60 MPH

What is your question?

There is no noise, and my tires are good, but once I get over 60MPH the steering wheel vibrates. Now at 90-100MPH, it's smooth as normal

What makes this problem better or worse?

Driving under 55 MPH OR over 90 MPH

How long has your 2011 INFINITI FX35 had this problem?

a month