The base of the Ninebot S (sold separately) self-balancing scooter installs into the back of this Gokart Kit to serve as the rear wheels and power source for the Gokart. Double the Fun: By attaching your Ninebot S (sold separately) to the GoKart Drift Kit, you can enjoy a fully-functional GoKart with range up to 13.7 miles and speed up to 10mph. Small Racer for Adults, Big Toy for Children. Drift Racing Excitement: Segway GoKart features a handbrake and brake pedal to switch forward and backward. A high steering ratio of 2.1:1 allows for precision steering while the strengthened seat belt ensures the rider's safety.