QSMOTOR 138 4000W Air Cooled Mid Drive Motor With Belt Shaft

Price:US $351.00/piece
Production Period:10-12DAYS

QSMOTOR 138 4000W Air Cooled Mid Drive Motor With Belt Shaft

For 138 4000W mid drive motor, it could be used for electric light motorcycle, which could be 72V 100KPH.

What’s more, we provide chain gear adapters(Optional)

P.S. If you have any confused about the shipping cost, please feel free to contact with us.

Also could place order but don't pay first, then we could adjust the price.


Sales contact: damon@siaecosys.com

Skype: Damon Wong(QSMOTOR)

We Chat:+86 18758618893


One set including below kits 

1. 1pc X QS 138 4kW Air Cooled Mid drive motor with belt shaft

 2. 1pc X Pulley

3. 1pc X 428 14T gear adapters(Optional)  


Aliexpress online purchasing link for this motor:  


Key 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

5) Water Cooler, which would have better temp resistance.


Product Description

1. Motor specification


Test Report




Dimension drawing:


Conversion Kits for QS-138-4KW 90H air-cooled mid drive motor


Application for QS-138-4KW Mid drive motor



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