it turns out that suspension matters...

I've been fishing my whole life. There's nothing quite like going out on a small lake with a canoe and casting along the lily pads with family. 

I obviously physically can't fix the bike in my current state but my mind can't stop wandering!!!   You're right,  it's almost a need, kind of like when you feel it just isn't running quite right so you spend all day syncing the carbs,  rechecking valve clearances, etc. 

hardrockminer wrote:

Lost my reply somehow.  Here it is again.

Thank you for watching the video.  Resonant frequency is the salient point.  The energy input for the bridge was the wind but it could be any source.  On a motorcycle it is the combination of suspension, center of mass and tire pressure.  Change any of these variables and you will change the resonant frequency to a different speed.  
 

Appreciated, but I watched the video a few decades ago It's practically required viewing for any physics or engineering undergrad