Gearing Spreadsheet

This is the spreadsheet I showed Derek that enables one to see the differences in overall gear ratios with changes in inernals:

http://www.keepandshare.com/doc/3378582/new-4-speed-gearbox-calculations-2010-xls-december-24-2011-4-14-pm-43k?da=y

I can not claim credit for it, it was given to me by an Aussie Bantam trials man Peter Sampson from Queensland.

If anyone has the time or energy, I guess one could also add in wheel circumference, revs etc and see speeds etc