New to the forum as well as running anything put pure thigh power in a bicycle, I thought it'd be a great addition to the garage and a fun commute! I found two vintage bicycles, one is a 19?? Schwinn "racer" that looks to be all original but needs to by tidied up (photo below) The other is an early 70's Free Spirit that seems to also be all original with time specific tire pump and rear rack (photo also below). My question for the the MotorBicycling community is which, if either, would be a good starting point for a moto-bike build? From the photos I've seen and threads I've skimmed over the Free Spirits frame accommodates an engine kit more- that being said I like the Schwinn's original classiness so damn much. Is there engine kits for that style of frame? Also, if anyone could point me to the right era that the Schwinn is coming out of that would be greatly appreciated. I've been riding bikes of one sort or another since I was a kid but my current bike is a fixed gear track build and vintage, motor powered cycles are very new to me.