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@eWoo
The whole thing looks a little bit restrictive to what frame you can put this system on, of course no including the obvious that you need to be able to move the chainstay away from the frame. Also looks like there are in this case only 4 ratios you can get. I believe that the sprockets and chainrings (not sure what the belt version names are!!) are proprietary, so you would be stuck with whatever ratios they provide!
Some random CDrive chart here:
Some more info on the CDrive system.