i just got 20's put on last wednesday. i have had it rebalance because when im on the freeway i feel a vibrations as best described??? my passanger seat vibrates, the vibration starts at 40mph to 60mph when im in that speed range.

this is my first set of 20's, i had 19's in the past and never had this problem? im thinking its maybe because i had 17' stocks and non-sport suspention??

is this typical for 20's??

 

First thing I'd think of is if the wheels were balanced.. What kind of wheels did you get?

 

Did you wheels require centering rings to be installed? If so, and if you didn't do it, there's your reason for the vibration.

More info on your rims would be appreciated.

 

I have had the exact same problem, the passenger side vibrates like %$#. but when i changed my tyres, to good ones, problem was solved

 

You might have a bent rim. I bent my oe rim and that's how mine feels and looks when looking at the pass seat.