i saw the one that connects to the pc3usb last year in fontana ama races. the guy selling it had it on a bike and showed (it was on a rear stand of course) how it automatically shifts it for u at whatever rpm u want. u do have to manually shift it back down but going up its hand and foot free. its way cool but i had recently bought a pc3r otherwise i wouldve yanked that set up, and threw it on my bike,