Tube Size Available in US? Is it possible to still purchase tubes for Continental 47-622 TravelMaster tires with 28x1.75 written on the side?
I had an old Rabeneick commuter bike (have no idea of the bike's age)  shipped back from Germany that I'm trying to put back together. I've never seen valves like these....they're not Schraeder or Presta.
Yes. If it actually measures 47mm wide inflated then it's a little caught between 2 sizes, but 700x45 tubes will work fine in it. 29x1.95-2.135ish tubes would also work, but be big. If it's Dunlop/Woods valve now then get Schrader. If it's Regina get Presta.