Thanks for the excellent info on both bikes, T-Mar. I recall an old graphic, IIRC from Raleigh or perhaps one of the French companies, depicting various frame styles captioned with the names. And I vaguely recall that not-quite-mixte being called a "sport". Seems like an awfully generic name for a frame style, however.

The Colorado is a triple; no crankset on the Expedition, but based on another of your posts, the standard Z204 FD is for a double.. The Ex is most definitely 126mm, and I think some attempt was made to cold-set the Colorado, because it measures out at about 127-128mm. A 126 hub fits a bit loose, and a 130 requires some force. So I reckon you're right; both were probably assembled by... err.... coercion BITD.

The Ex has a Spinner fork, stamped 1987 and "HI TEN" on the steerer tube. So that would be consistent with the bike being hi-ten except for the seat tube.