1:24 Scale tracks used for competition are generally 6-8 lane routed tracks with either wooden or flexible plastic retaining walls.
Instructions on how to install both the lane and finish line tape.
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Often round robins are modified to include a "main" and sometimes also a "last-chance" heat.Motor magnets must be ceramic, traction magnets may be polymer.HO scale, a generalized size, originally 1:76 - 1:87, now usually closer to 1:64 scale.The association also organises the British open championships for both scales.The usra rules have their roots in the NCC rules of the early 1970s which were written with the goal of making a number of under-classes in slot racing to allow more diversity in competition.The usra (United Slot Racers Association) is the organizer of the usra National Championship for Division 1 and Division 2 racing.
During its heyday, the slot-car racing industry was a 500-million-a-year business." Pond, Steve (January 1990).