Bought this bike about three years ago and it was out on loan more than it was at home until a year ago. My kids named it Kermit because of the color. It now lives on my trainer. It was the cheapest road bike Schwinn made that year. About 38 pounds of Electro-Forged steel.
It is posted on Old Ten Speed Gallery: Roger’s 1978 Schwinn Sportabout | Old Ten Speed Gallery
Be sure to click on the Rock Racing link on the page, and note the date it appeared.