Re: lifan motor
With that much power I would not mount that in a standard bicycle frame. I would build a custom bicycle frame specifically for that motor. Hydraulic disc brakes front and back and if it has to be a rigid frame at least get a front shock. It would be better as a full suspension build, in my own humble opinion of course.
How ever you decide to do it I will be following this build now.
"I would rather be exposed to the inconveniences attending too much liberty than to those attending too small a degree of it." - Thomas Jefferson