I would say they are really best for a city commuter (I recently transplanted them onto my city bike), because the dynamos do add resistance to the system.

• 我想说的是，这款产品真的很适合经常要往返城乡之间的人。（我最近把它装在了我的工作自行车上），因为充电器还为系统增加了制动电阻。