I just blew up the picture of the 1980 Schwinn CX7-6 in the Waterford scans and I believe that bike has the Uniroyal/Carlisle Nobby tire mounted, not the "Schwinn Studded Balloon".I'm getting confused. Has anybody be able to prove the existence of a 26" x 2.125" "Schwinn Studded Balloon" tire prior to 1981?