I have a couple of '80s frames with very suspicious bulges in the seat tube at about the bottom of the seat post. My guess is that it's easy to overtighten a seat post expander bolt against a tube that is pretty thin right there.
Dave Ross Portola Valley, CA USA
Angel Garcia wrote:
So, I've picked up a quite beautifully made, let's call it an Italian KOF bike, that doesn't use a binder bolt at all. I like how clean it looks. The seatpost is kept in place through an expander at the bottom of the post. Other than difficulty in finding another seatpost in the future are there any downsides to this type of design?