They need to be balanced. This is done by placing them on a machine which spins the wheels and determines where and how much weight to put along the rim. The weights are either clamped along the rim or there are self-adhesive weights that can be stuck to the inside on custom rims.
because wheels need balancing
you need to re-aline the wheels
Wheels need to be balanced, especially if shaking increases with speed..Tom.
Wheels are not balanced or ball joints
take her to the vet
get your wheels balanced
Anxious/Anxiety
You have a mechanical defect such as a worn wheel bearing or your wheels are not correctly balanced.
I had a minor one, balanced the wheels and it went away, you may also have a tire separation. I have heard of major shaking issues with the CTS though
keeps shaking Coconut trees until you get a golden pineapple
The only that I know of is that you need an alignment.
Shaking at speed - probably due to poor wheel alignment or wheels needing balancing