Why does my Audi 80 start shaking at high speeds?

I've noticed that my Audi 80 starts shuddering and shaking when I reach speeds of 75 mph or above. What could be causing this issue and how can I fix it?

It is likely that your tires are out of balance.

Have you had your wheels aligned recently? Misaligned wheels can cause vibrations at high speeds.

Another possibility could be worn out suspension components. I would recommend getting your car inspected by a mechanic.