My Trackmagic kart came with paddle (butterfly) shifter. It sucked ass! The problem was that the upshifts pulled the cable to shift and worked pretty good. The down shifts pushed through the cable and was pretty worthless. Sometimes it would downshift and sometimes it wouldnt. I think a double cable setup would have worked pretty good, but I lost interest in that idea and put in a standard bump shift system purchased used off of ebay for a song.