Originally Posted by
Bob Barker
Closer to home, old steel Treks in the 5xx and 6xx lines were commonly mixed tubesets, different mfgrs. Lots of Italian bikes built with mixed tubesets, too, but probably more often using tubes from the same mfgr.
+1. lots of mid-range and upper range 80s treks had reynolds main tubes and tange or truetemper forks and stays.