The Fine Print : This app was written entirely by me, vince@vmar.com, I was going to put in all kinds of traps, so you couldn't have a bunch of impossible gear ratios..., but decided to just let the app do any calculation you ask it to. Therfore you may get results that are unrealistic (but accurate).If you have a question on a particular combination you can ask me, and if I can help you out I will.