Originally Posted by
Dampcookie
I found out how the crack started. The stantard seat post that came with the bike was undersized (25.4) when it really needed a 27.4 post. The result was that the quick release seat was over tightened and caused the crack. Huh. I've switched the post, so I'll see how that works.
Good grief, that was a huge mis-match when it comes to seatposts. I'm amazed the seatpost clamp could be tightened enough to keep the undesized post from slipping without breaking off the "ears".