Originally Posted by
cudak888
John, just out of curiosity, would you know if Tange ever did such stampings on main triangle tubing (like Columbus, and as opposed to the steer tube), and if so, where one would expect to find it?
I don't recall any, and I just check a couple sets of Tange tubing I have here and found no markings. Tange steer tubes are rifled like Columbus, but have 6 ridges vs 5 with Columbus. But even this isn't definitive because Vitus also used 6 helical ridges in their steer tubes.