Nor can anyone, because it doesn't actually exist as a product that can be tested. This pops up every few months for some reason, with the same note: The rear s

Nor can anyone, because it doesn't actually exist as a product that can be tested. This pops up every few months for some reason, with the same note: The rear shifter is not controllable. A wire to the back half with a bearing to a ring around the drive shaft would solve that, but I'm guessing that messes with their stated high efficiency goal.