AKAIK Ladies Raleigh Sports came in 19.5" and 21". If you need a smaller frame the Colt has a 17"/18" with the 26" wheels (that is what my wife rides) or if you can find them the Space Rider came with a 16" frame and 24" wheels. The smaller bikes were built to the same standard as the full sized models, but apparently not as many were sold.
Aaron