S-2 Schwinn Tubular Rims, with 26 x 2.125 Typhoon Black sidewall Tires were original. Knobby tires and thorn resistant inner tubes were an upgrade. This model had lots of possible options and you will see them equipped many different ways for delivery service. Some of the more common options were 105 gauge or 120 gauge spokes, heavy duty (3/8" axle) front hubs (Usually Schwinn's "phone dial", or Bendix), Messinger 7000 saddles (Brown or Black plastic, or some Leather covers), Tall Superior handle bar stems called Cycle Truck stems. Our dealership always set them up originally with Box handle bars. Spring Forks were another common upgrade. Mc Caully rear racks and large Wald rear baskets were commonly installed.
John