The wheel size is 700c or 29. The kit contains Throttle 48 volt. USB cable, Two Torque arms, Cruise control,,, Comes with spare rim and also spokes. There is a USB cable to change speeds and voltages, The 48 volt kit is fast and can be shown operating. . This golden Motor kit can be set for different voltages.. The controller is build in the hub motor, my cell if you have any questions, I reduced the price to 350 dollars. lowest i can go..