useful gearing chart
 

this is a very useful site for working out gearing options- once you're sure which engine you then you can put in any sprocket combo and see the effect they'll have-
I found copying out the figures for say 8500rpm in top gear for all the likely sprocket combos into a chart makes it quick and easy to see how any of your options relate to each other


http://www.gearingcommander.com/

there is also a very good gearing App for your smart phone these days

Link?

Your wish is my command :p:

https://play.google.com/store/apps/d...rapporti&hl=it

Thanks Kev!