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Slot Car Racetracks | Slot Car Racing Sets
The so-called "HO" sized slot cars, introduced in the 1960s at about 1:76 scale, now average around 1:64 scale.
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As racing in this size evolved, the cars were enlarged to take more powerful motors, and today they are often 1:64 or larger in scale; but they still run on track of approximately the same width, and are generically referred to as HO slot cars.