The Curve D3 was probably not a great subject to propose such a conversion on. At the moment, out of my too large stable of folding bikes, I do think that this one is the one I'm going to take to France for a my upcoming 3 week trip. It rides surprisingly well, and as Thor pointed out in another thread, it disassembles pretty quickly and easily for packing in an airline legal suitcase. The Big Apple tires make the ride pretty comfortable. In my state of mediocre physical conditioning at the moment, I'm still able to ride it up to the top of a moderate hill without dismounting. I probably won't be riding it 30 miles in a day, but 20 miles seems quite doable, and 30 if I don't mind spending a lot of time in the saddle, so to speak.

Nothwithstanding any of this, a Gates Carbon Drive conversion on this bike seems probably to be not worth the effort . . . . plus the chain comes off completely when the rear wheel is taken off, so it can be put in a plastic bag, minimizing the mess and reducing the rationale for such a conversion in the first place.