750 seat post dia.
That's interesting! I took my stock(?) post to Performance Bicycle yesterday, asked the ace repair guy if the 26.8 they had would work, he pointed out that the stocker has "26.6" stamped in it, and said, "Nope." (Note to self: Before comparing various caliper readings, look for size markings on the item itself.) .2-mm is such a tiny difference, had he not told me that I would have tried the 26.8 one. So I came home and ordered one.
Lesson: Remove your seatpost and look at it. There may well be a size stamped thereon.
I surely am going to miss the guys at Performance when they close; they have been gold for me, so much so that I've bought an ebike and a carbon fiber Gran Fondo in the last three months. PB's warranty and support, especially these guy at this one in Beaverton, Oregon, were of such excellence, I wanted to support them. So it goes. They really, really like the commuter I've built out of my 750, by the way.
Last edited by agiyo; 12-23-18 at 07:44 PM.