Wheel vibration

okay, so i have a 2003 cadillac cts. sometimes when i am driving (usually when i hit higher speeds, but not always) i can feel a good deal of vibration through my wheel. i thought it might be that my tires (which are new) might need to be balanced but the ride is smooth as silk…i just feel the vibration through the wheel.any help or ideas would be awesome, thanks

Check the balance first, step 2 alignment.

You should be aware that these vehicles are overly sensitive to out of balance and out of round tires, as well as other related vibrations. Sometimes the source of the vibration is something else entirely and incredibly difficult to find.