I've got a 1980 something Kuwahara American Flyer. 012 frame, Suntour shifters & derailleurs, Sugino cranks, Shimano 600 brakes. I replaced the 27" wheels with new CR-18 alloy ones from Niagra. Soaked the freewheel & all the bits in diesel fuel. It cleaned up much nicer than I expected. I tossed the drop bars & installed upright bars with Suntour thumb shifters. It's currently my favorite city bike.