To avoid purchasing more than one seat post to discover the size needed, you could purchase or borrow a seatpost sizing rod, like Stein makes. See biketoolsetc.com or perhaps your local bike shop ....Peter
...................................... Peter Brueggeman La Jolla California USA pbrueggeman(AT)ucsd.edu
Thanks to the members who replied. I think the model is the Super Corsa and the thinking from the list is 26.2 so I'll start my search for one.
Derek Willburn
Long Beach, CA USA