I bought an '87 Prelude, 2 months ago, at a yard sale, rode it for a week; then moved south to Letour Luxe land. I've now returned to Prelude land, for one more week, before returning to México. I'm going on a group ride in a few minutes, and in preparation, replaced the tube in the rear tire, which has a bent internal stem on the presta valve. It's also yellow, and translucent, something I've never seen before. Now I've been cycling for 50 years, but always on entry level bikes, until now. It's a Schwinn Dura Sport. Made in Japan. Inside of a Schwinn Super Record tire, so probably original. Were these things common back in the day? Can I treat it like a latex tube when it comes to patching it?