1970? Schwinn Varsity. One-piece crank. The label on the RD says Sprint / Made in France. There is obviously a place for the same label on the FD. Stem-mounted upright friction shift levers.
One pulley wheel on the RD is missing half its rubber tire. The bearings feel dry but not crunchy. Can I - and should I - replace it with a modern pulley wheel? What kind?
What should I use to grease the Sprint pulley bearings? The same marine grease I'm using in the hubs & BB?