(May 79) Schwinn all original except tires.
I am not a big Schwinn collector and almost took a pass. Found at a local flea market.
I passed on buying it the first week it, came back the next and the guy still had it. I quizzed the guy on it's history and he knew nothing. (I think he got it at a yard sale and did not want to tell)
Still need to clean it up a bit. Pictured as found. Hope you like. Thank you.
From the 1979 catalog :
"The SX 100 brings you just about eveything you need to start winning. Schwinn flash welded carbon steel frame with gusset reinforcement, glass fiber reinforced nylon MAG wheels, new equilted competition saddle, cross-brazed handlebar, coaster brake. Weight 32 pounds."