Ningbo Penk Intelligent Technology Co.,Ltd, Was founded in 1990'S, Specializing in producing bicycle and electric bicycle parts. The three main products are brake sets, Derailleur systems ,Pedals and more than 100 other related accessories
速度：3速
安装孔径：31.8&34.9MM
拉线方式：上下双拉
兼容齿数：42T
齿容量：20T
链线：47.5mm-50mm
颜色：黑色+银色
重量：148克
