BionX S 350 DX Electric Bike Conversion Kit
The BionX S 350 DX Electric Bike Conversion Kit! The S 350 DX is the most powerful BionX kit available and can help you get out and about with ease, Big Hills? No problem! 65 Mile ride? No problem! 20 MPH? No problem! The new 2014 system helps with Proportional assist with 4 levels that help give you a safe and natural ride feeling.