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@Velocio
I was looking at the belt drive stuff for my Mather. Trying to use the calculators for what bits to buy is doing my head in... I think I need to build a web page to figure all the shit out for me. Gates have a Excel spreadsheet you can download but it's not entirely helpful, it gives you a good idea but it's hard to feel willing to drop £150+ on something that you're not even sure will fit and you'll have no chance of re-selling.
My problem is that I want it to work with both single-speed and the geared Rohloff. The single-speed comes with a 20t > 32t rear, and the Rohloff only comes with a 19t rear. The difference is enough to make tensioning not work so it seems I'd have to have different fronts too... 60t and 55t. And the result is different lengthed belts, and finally different gear inches (65 vs 77).
All seems to be quite complex, there was my thinking that if I'd geared my Rohloff direct drive to be the same as my single-speed gear inches this would be easy. If only I'd known 6 months ago that the Rohloff rear sprocket would be a unique size!