7-speed on the rear, the electric hub takes a screw on freewheel and 7 speeds is all there's room for. 7 and 8 speed spacing is the same so all I had to do was adjust the limit on the deraileur. I definitely need a 60 tooth ring on the front. I can add power through the pedals up to about 18-20mph, but anything above that is all electric. I do have fun just acting like I'm pedaling at 35mph to mess with people's heads. The front wheel is off my BMX and I was thinking I might want something a bit more robust up there due to the higher speeds.