julio 24, 2026
QS138-C 90H V3 with 1:2.37 gear box 4000w Mid drive motor kit- Motor Spec -Motor Type: PMSM Motor With Hall SensorRated Power: 4000W (13500W peak in few seconds)Rated Voltage: 72VMagnet Height: 90mm, 5 pole pairsMotor Gear Ratio: 1:2.35Speed: 4800RPM (basic RPM), 7000RPM peak with flux weakeningMotor Design: Single axleRated Torque: 32N.mMax Torque: 150N.mMax Efficiency: approx 93%Rated Current: 60A Peak Battery Current: 200A Working Temperature: 70-120℃ , peak 150 ℃Hall Sensor: Single Hall Set with waterproof connectorWaterproof Grade: IP66Cooling: Air coolingColor: BlackN.W./G.W.: approx 14.5kg/16.5kgPackage Dimension: 34cm*34cm*33cmKey Features: 1) Light weight and small dimension compare to hub motor 2) High performance benefit from flux weakening 3) High efficiency during climbing, and better acceleration 4)Support regenerative braking For QS138 4000W V3 mid drive motor , it could be used for electric light motorcycle dirtbike.E-motorcycle weight, approx 130kg+2*80kgClimbing slope: 30°@208kgBattery: 72V50Ah 300A bms One set including below kits: 1pc*QS138-C 90H V3 mid drive motor with 1:2.36 gear box1pc*ND72680 Fardriver controller (blue color build-in bluetooth version)1pc * 428 14T sprocket1pc * 3pin Throttle OR 1 * QS138-C 90H V3 mid drive motor with 1:2.36 gear box1* 428-14T sprocket Introducing the QS138-C 90H 4000W V3 Mid Drive Motor with Internal Gear Box 1:2.35 Ratio, a high-quality electric bicycle component that is perfect for any universal bike type. This motor is designed with a 72V voltage and is made by the trusted brand QS. The set includes the motor, controller, throttle, and sprocket, making it a convenient all-in-one purchase. The motor weighs 40 lb and is made in China. It is part type motor and is compatible with any universal bike type. This item is perfect for any cycling enthusiast looking to upgrade their electric bicycle. Shipping and Feedback:1. Please check your name, address, and phone number is right.2.This product will be shipped from USA Los Angeles warehouse (FedEx Ground economy), it takes about 7 business days .3. After you place a order, we will ship out your goods as soon as possible, please check the tracking timely.4. If you can’t find the tracking, please let us know, we will provide a positive feedback to you.5.We will be appreciated of that you leave us a 5 star feedback if you are satisfied with our goods.6.If you have any problems with our goods, please contact us first!!! We will do our best service to help you.7.Any questions, don’t hesitate to contact us.