| 摘要 |
A bicycle stem having a positioning mechanism for re-positioning a handle comprises a vertical tube; an adaptor having a bore and an extension, wherein the bore receives therein the vertical tube so that the adaptor can rotate about the vertical tube; a lateral tube with a front end having a clamp for locking the handle, and a rear end pivotally connected to the extension of the adaptor; and a positioning mechanism comprising a rod for fixing the adaptor on the vertical tube as the adaptor is rotated to the required position about the vertical tube.
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