I'm pretty sure that the arcsin will give you the angle between the horizontal and the bike. Arccosine on the other hand gives the angle between the vertical and the bike. Also subracting the answer the calculator gives you from 90 will do the same thing. For example, I get an answer of 62 degrees which I know isn't right bc my bike pedal strikes like a mother. 28 degrees puts me in the training wheels catagory. Sweet.

Also for those of you in the 60 degree lean range some quick calculations show that your top tube would have to be about 16 inches from the pavement for a bike with 32.5 inches of standover. YIKES!