Sprocket gearing spreadsheet
 

Use the link for an Excel spreadsheet that allows you to calculate the speed per thosand rpm (in miles or km per hour) for any possible gearing combination. A handy little tool :)

http://ozfirestorm.proboards34.com/i...ead=1107340911

cheers
Mikstr

And you will note, courtesy of your mates in Australia at "ozfirestorm.com.au"

indeed, some clever folks "Downunder" :)