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Made of high quality material, and practical to use. High torque design, better for complex road conditions and places with high climbing slopes. Used to replace the electric bike, electric scooter, fat bike HUB motor. Support for Screw-in 6-9 speed flywheel, right disc brake. Left side, diagonal motor cable design. Fine steel forging made of excellent steel, easy to long service life. Excellent copper core Excellent copper movement, precision winding technology, improve power and performance. Easy to use and install, Good compatibility. Rear-drive rotorcraft 6-9 speed motor open 170Mm. Color: Black (As Pictures Show). Rated Efficiency(%):>=80. Wheel Size (inch):16”20”24”26”27.5”28”29”700C. Size : approx 48V 750W , 36hole spoke (options). The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. Please allow slight manual measurement deviation for the data. Please kindly note that. Also, the each additional item means. The the same color and size. Transit time may be a little delayed because of the. If you have any questions.