【奧運冷知識】場地賽的單車為何沒有「brakes」?

【體路資訊】2020東京奧運將會有33個運動大項,其中一項為單車,當中又細分為場地單車、公路單車、山地單車、BMX單車土坡競速和BMX單車平地花式五個比賽項目。


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