The majority of Scalextric Products are 1:32 scale, though between 1968 and 1970 Super124 cars and track were manufactured at 1:24 scale. In the late Nineties, Micro Scalextric at 1:64 scale was introduced.[citation needed] Cars and track are not compatible between scales; however 1950s models should run on modern Scalextric track and vice versa.[citation needed]

At the beginning of the 21st century Scalextric did a major redesign to make the track easier to assemble. The new design is known as ATS. ATS track can be connected to the classic design of track using special adaptor pieces.[citation needed]

Also introduced this century is Scalextric Sport Digital, in which up to 6 digital cars can be raced in a single slot. The cars can change from one slot to another using special slot-lane change tracks, the lane change or otherwise being controlled by a button on the throttle. Sport digital cars should run on non-digital track unmodified, but standard cars require a new circuit (digital chip) to be added to them before they can run on the digital system.[citation needed]

Other manufacturers (such as Fly, MRRC, SCX and Ninco) produced cars that can run on Scalextric track without modification.

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