Anyone know what this is? If it's even from my bike? I came home, got off, smoked, checked bike and right in front of rear tire was one of this tiny puck the size of a penny! My garage is pretty damn clean so it's gotta come from the bike somehow. Hopefully it's not part of my bike but something the rear tire picked up and dropped when I stopped. Is this the puck that FAQ was talking about that flakes off the engine? I checked and really can't find anything looking like this from the bike. Sorry for being paranoid. Any hints would be helpful.