Most likely cause is that you need your tires rebalanced. The only other thing I can think of is since you didn't put at what speeds this happens at is you could have a small buldge in one of your tires
The 2012 Volkswagen Beetle has 39.4 in. of front head room.
The 2014 Volkswagen Beetle has 55.3 in. of front shoulder room.
The 2013 Volkswagen Beetle has 55.3 in. of front shoulder room.
The 2013 Volkswagen Beetle has 39.4 in. of front head room.
The 2012 Volkswagen Beetle has 41.3 in. of front leg room.
The 2014 Volkswagen Beetle has 41.3 in. of front leg room.
The 2014 Volkswagen Beetle has 39.4 in. of front head room.
The 2013 Volkswagen Beetle has 41.3 in. of front leg room.
The 2012 Volkswagen Beetle has 55.3 in. of front shoulder room.
The front track of the 2013 Volkswagen Beetle is 5 ft. 2.2 in. (62.2 in.).
The 2014 Volkswagen Beetle-Convertible has 39.3 in. of front head room.
The 2013 Volkswagen Beetle-Convertible has 41.3 in. of front leg room.