Author: ElectricBikeReview.com via YouTube
https://electricbikereview.com/eunorau/48v-500w-tongsheng-mid-motor-kit/ The EUNORAU 48v 500w Tongsheng Mid Motor Kit is a surprisingly smooth torque sensing mid-drive kit, with waterproof connectors and a slim profile. The downtube battery pack keeps weight low and center on the frame, it can be charged on or off the bike and the plugin port is located away from the crank arms for protection. Thumb throttle offer power override at any level of assist, Full color display with easy read out and active energy use displayed. Additional work is required to install kits (or money if you work with a shop), wires usually cannot be internally routed, two bolt battery pack mount can be a challenge depending on the donor frame.