Also in this forum there are a lot of posts about gearing ratio, chains and sprockets.

Have a look at the Gearing Commander
It's a Online motorcycle speed calculator with many bike presets for gearing, sprockets, drive ratio, tyres, chain, max. RPM etc. See effect on RPM when changing sprockets at certain changeable speeds, see effect on your topspeed, see effect on sprocket distance, see effect on needed chain length and links and so on.

Please let me know what you think of it.

Kind regards, Jean
ducmans@yahoo.com
BTW: If your bike is not in the presets, send me all stock data and I'll add it.