BS ISO 6699-2016 pdf download.Cycles一Handlebar centre and stem dimensions.
This International Standard specifies the dimensions and tolerances to ensure secure assembly between the stem and the handlebar centre of a bicycle.
This International Standard 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.
This International Standard 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.
2 Normative references
The Following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 42 10-2:2015, Cycles — Safety requirements for bicycles — Part 2: Requirements for city and trekking, young adult, mountain and racing bicycles
3 Dimensions
3.1 External diameter of the handlebar
The external diameter of the handlebar, D, at the stem interface shall be according to Table 1 (see Figure 1).
3.2 Internal diameter of the stem clamp
The internal diameter of the stem clamp, d, shall be according to Table 1 (see Figure 2).
The internal diameter of the stem clamp can be measured with a tube of the corresponding external
diameter.
3.3 Assembly conditions
The assembly of the stem and the handlebar bend, with the clamping bolt tightened with the torque recommended by the manufacturer, shall comply with the requirements of ISO 4210-2:2015, 4.7.BS ISO 6699 pdf download.