Got a message about these folks yesterday. This is a conversion using a battery that can mount onto a frame tube with a supplied bracket, and the motor and drive are mounted underneath the bike. It uses a small drive wheel that contacts the tire. $164.00. They call them selves Eazy-Bike.
https://www.indiegogo.com/projects/...n-an-ebike-technology/x/17491591#/?ref=751509
https://www.indiegogo.com/projects/...n-an-ebike-technology/x/17491591#/?ref=751509