Originally Posted by
Dean V
Seems crazy to rule out the CAAD just because you have lots of nice 27.2mm seat posts. Doesn't cost that much to buy one nice 25.4mm post. One is all you need!
Many used frames are sold with proprietary parts, and it is also something to keep in mind when comparing two similar frames for sale.
So, with some luck, there would be no seatpost to buy, and no reason to raid the parts bin.