thinkthink1:楼主应该是记错品牌了，看着辐条没错，外观像老款施图美内3外2
(2019-04-17 23:49) 
The German company Fichtel & Sachs, often called only "Sachs", started making internal-gear hubs in the early 20th century. In 1997, the American company SRAM acquired Fichtel & Sachs, and so recent products carry the SRAM name. SRAM quit making internal-gear hubs in February, 2017, citing a race to the bottom in the market, and the increasing popularity of e-bikes.
懒得翻译了，自己看吧，哎，我这贴咋成了科普贴了
内容来自Android手机客户端
