I was looking into starting a new build on another bike and wanted a list of compatible Road/Mountain bikes that are stock(or require minimal[cheap] modifications to the rear shifting mechanism ie. not having to buy nuvinci hub) that can accommodate a jack shaft kit. I currently have a schwinn multi runner with a motor(if the jack shaft shift can be used on this then ill keep it). I would end up selling my whole motorized bicycle and getting a new motor, bike, and jack shaft kit. Thank you. on a side note i plan to use my motorized bike to pedal on trails and use the motor to go to school as I currently do with my old schwinn motorized bike. Will the jack shaft kit make pedaling a nightmare, or keep it the same as when a motor is attached.