I am not sure about the exact drop, but I'm trying to achieve the smallest angle between the top tube and my torso. I'll see if I can approximate it tonight in cms. I've been having seatbone discomfort on long rides and realized that my position is too upright - basically 0 drop between saddle and handlebars on a stock CAAD10. There was a great thread with videos that helped me a lot: Riding Position Discovery