motor138Flexible and Powerful: The Ultimate Motorized Pulley for Medium-Lht Loads. Drive for medium-lht loads and with steel gearbox. This motorized pulley is a flexible component because ofIt's Electric Motorcycle Kit QS138 90H V3 4KW 7200rpm with 1:2.35 gear box Mid Drive Motor Kits with Fardriver ND72680 Controller 350A 680A