Hi Shelton, My friend, Dick Marr, wrote a book on bike gearing. http://www.amazon.com/Bicycle-Gearing-A-Practical-Guide/dp/0898861845 Susan
I clicked on the link to Dick Marr's book, which received very good reviews by the way, and came across this other link http://uk.ask.com/wiki/Bicycle_gearing, which must contain pretty much all that anyone might need to know on the subject.
Nicho - did you click on the link to see what happened? Here it is again: http://uk.ask.com/wiki/Bicycle_gearing
