Gngelectric supply inexpensive electric bike kits system which allow you
 to convert your own conventional bike into a battery-powered electric bicycle.

Materials: 6061 aluminium alloy

Colours: anode coating Red/ Black

Includes:As shown in the first picture

Specification:36 spoke holes,18T sprocket 

Introduction:Hub and the sprocket have been quenched, Smooth and strong bearing,shiny surface,top quality。