I'm considering replacing the fork on my bicycle and I'm trying to determine what effect it will have on handling.  Sheldon Brown (the bicycling Guru online) has a formula to determine the new fork's affect on my headtube angle.  It's a trig problem and I have no idea how to solve it.  

I've entered the relevant numbers into his forumla.  I'm guessing it will be a simple problem for a person with a calculator with trig functions   Can anyone help me out?  

Thanks!


arcsin [(390  -  403)  /  (1030)]

-0.72° if you're using degrees



-0.80° if you're using gradians


 

I'm interested in hearing more about this "gradian"

A gradian is 1/400th of a circle, where a degree is 1/360th of a circle.



 

*Radian.

No one is disputing that but you expressed the gradian in degrees. Which is it?

Thanks!  That helps a lot!