The Razor RX200 scooter's rear wheel is unique to the RX200 model because it has a disc brake rotor on it and none of the other razor scooters with 200x50 wheels has disc brakes.
We have ordered RX200 rear wheels and expect them to arrive in a month or two. We could send you an email when they are in stock if you would like?
You got it. We will send you an email as soon as they are back in stock. Thank you.