Hello everybody, bobbin a 72 and want to go with a disc brake in the rear. Need a 16" wheel to do so from what I understand. The bike is already really low, can not afford to go any lower. Is there a tire that will make a 16" somewhat close to the factory 18" overall diameter. If so what tire and how much more ground clearance will I loose?

All replies greatly appreciated!!![/align][/align]