LOL, I have absolutely no freakin' idea ! The only person wo saw it happen was driving nearby (no she did not hit me) so she couldn't help me w details. She is a first year med student though, and was able to give me very prelim care before the others and the ambulance arrived. I was in Pt Reyes State Park and they did well by me.

From what I've been able to glean from others, I was on a short downhill and I went over the h-bars. It was bumpy & potholey around there so maybe I just hit one wrong. Good helmet, may it rest in piece.