High Speed vibration, can't find what's causing it.

Ok I've learned my lesson. I'm due for new slicks at the end of the season and from now on they get balanced!

Happy it’s fixed. It was interesting to see lots of theories and others’ suggestions. I’m happy it was something simple as I’ve often found, most of the time it usually is something simple. Especially if you have a solid foundation (meaning the car) to start with.