Subject: What forces enable motorcycle to go through turns at the highest speeds?

On the racetrack, I can go through turns faster when I "hang off" the 
motorcycle, i.e., shift my body so that the bulk of my weight is toward 
the bottom and inside.  I know that I'm shifting my center of gravity, but 
it seems that I am counteracting other forces with this maneuver as well.  
What forces are involved in riding a motorcycle through an arc, and what 
forces am I counteracting by hanging off of the bike?

Re: What forces enable motorcycle to go through turns at the highest speeds?