Model Number: FC-M171 Use: Mountain Bikes Category: Chain Wheel Name: SHIMANO Origin: Malaysia All specifications on this page refer to OEM version products. These are genuine Shimano products designed for bicycle manufacturers and supplied through the OEM channel for use in bicycle assembly. As such, they are intended to become integral components of bicycles during the manufacturing process. OEM products typically do not include retail packaging, allowing for greater efficiency in bulk handling and lower costs compared to consumer versions. For example, when purchasing a bicycle from a retailer like Trek, the original components are sourced via the OEM channel. If replacement parts are needed later, consumers generally purchase the retail-packaged consumer versions available in stores.