Originally Posted by
BMC_Kid
I can’t speak for aluminum frames but there is nothing inherently wrong with a quill seatpost in a vintage steel frame as long as you keep them maintained and lubricated, same as any quill stem. My 1990 Moser Leader ex-race bike was designed for one and does what it needs to without any issues at all.
And therein lies the rub, too many of both types have ended up in the hands of far less conscientious than us, plenty have been neglected and live to tell the tale but the quill SP's have far less sense of humor than the others and are far rarer to find when you need another.
The Colnago I did awhile back had a wonky ST that took a bunch of hand work to get the panto SP to work well and on top of that it had a Sugino binder with a key that had been carving into the clamp ear. Both things being cardinal sins IMO on a Colnago especially.