ISO 6699:2016规定了尺寸和公差，以确保自行车杆和把手中心之间的安全装配。 本标准适用于在公共道路上使用的自行车，其鞍座高度可调整为635 mm或以上。 它不适用于特殊类型的自行车，如商人送货自行车、吊篮、玩具自行车以及设计和装备用于经批准的竞赛活动的自行车。

ISO 6699:2016 specifies the dimensions and tolerances to ensure secure assembly between the stem and the handlebar centre of a bicycle. It is applicable for bicycles intended for use on public roads, and on which the saddle can be adjusted to provide a saddle height of 635 mm or more. It is not applicable for specialized types of bicycle, such as tradesmen's delivery bicycles, tandems, toy bicycles and bicycles designed and equipped for use in sanctioned competitive events.