A cap and two pinch bolts hold the crank in place, rather like a threadless headset.

• 与大飞联体的中轴，在安装时有些像在装无纹前叉：在轴的另一端，（有装大飞的）柄像立把（叫做鹅颈）样，用两颗螺丝把中轴夹紧。