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Why is keirin racing especially popular in Japan?

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Keirin racing is especially popular in Japan primarily because betting on the outcome of these events is legal, functioning similarly to horse or dog racing.1

This unique status as a regulated gambling sport has helped establish a professional circuit that attracts international track stars, who participate both for the competitive experience and for the professional salary. As a form of motor-paced race, it remains a distinct and significant fixture within the broader landscape of cycling competition.1