motor138Motorized Pulley 138LS, with machined helical gear box, performs an efficiency, in a compact diameter of 138 mm only. With a min RL of 300 mm and powers ranging from 0.10 to 0.75kWDetail Specification Item: QS138 90H 72V 120kmph Mid Drive Motor Motor Desn: Single axle Magnet Heht: 90mm, 5 pole pairs Diameter of stator: 138mm Rated Power: