I have been riding my first K bike for several months now. It is a 1990 K75C. I found that whenever I pushed it over 70, my head would get hammered by wicked turbulence. Riding on a windy day was even worse. Altering my head/body position did not quiet the storm. About a week ago, I bought a Nolan 104. 70 feels like 50. I can now ride 90+ with no turbulence.
