Greenger motors

Hey everyone new here but ive been researching my first build for a while and now a friend of mine has taken an interest in building an electric dirt bike and found a site called greenger motors i searched here for any mention of it but there was none. Any insight would be helpful.

I've heard of them.. they have a kids electric dirt bike and are pretty active on facebook (if your not allergic to that).. worth a look.. what are you trying to build, or buy??