[autoavia]

Good video. Because Scalextric, Carrera, SCX etc are marketed as toys they have to comply with many safety standards that do not apply to brands targeting the adult hobby market. It is my understanding that a car with interchangeable easily removed wheels and gears wouldn't pass the child safety tests because it could be easily broken down into parts that could be swallowed by a child and, as mentioned in the video toy manufacturers have to design a body and chassis that will survive rough handling and crashes due to poor driving.
 It does emphasise the gulf between toy slot cars and cars intended for club racing and why it is impossible to produce cars which are suitable for both markets.