Tongxin NANO 36V front motor 80mm, 260rpm KIT specially designed for Dahon, Tern 20" Folding bikes. 

Weight = 2065g

Diameter = 118mm

Kit includes motor, controller, throttle, 20" DW Rim 36h (Kinetix Comp). 

Spokes (157mm) not included.

The brushless, high-speed, flexible-decelerated moto, developed by Zhejiang University Tongxin Electric Technology Company. It sets a whole new world of decelerating structure. Its structure is a development of Planet decelerating with single layer, and its hub is made of high shake-absorptive, light weight, quite environmental Alu-Meg Alloy material. The whole moto is quite light weight, small size. It is the most ideal moto by now. The max diameter is only 118mm, the weight is only 2065g, and the structure is optimized.