The HB8GS regular version of this motor 36V 250W, max speed 15KM/H. The motor is brushless dc motor with hall sensors. It has 6 holes for disc brake plate. You can add the disc brake for this motor.
You can also buy the double shaft version model number HUB8SF , For this motor general information, you could refer to double shaft motor here http://www.uumotor.com/8-inch-hub-motor-solid-tyre-disc-braking-36v-250w.html
Updated joystick controller as follows: