Originally Posted by JohnJ80

sure looks like it is to me. She looked like she hit either a road imperfection or something on the road when the bars jump. That’s a classic “impulse response” from control theory and it looks to me like it set up either an under damped or resonant response in the frame. That would be right in like with what I was saying prior. An impulse like that contains many high frequency components - actually many of all frequencies - of which some were at a sensitive part of the frames frequency response and an oscillation starts.

it’s an excellent example both of how any bike is susceptible and how it can become uncontrollable for even the best riders.

thoughts and prayers out to Chloe. One of my favorite riders. Hoping for a quick and complete recovery.