I've gone over my theory on this previously.
http://www.nestreetriders.com/forum/...threadid=18611
Works for me. Find out what works for you.
edit: Oh yea, just because knee touches doesn't mean you stop leaning. As Ken said, it's a feeler gauge letting you know how much lean angle you have left. Not going to make corner, lean over more. Riding Pete's ZX... stop leaning when knee touches immediately