This thread reminded me yet again of my seatpost woes. My Kuota takes a 30.0 post, a size only available in alloy from Thompson as a replacement. I tried a cheap Chinese carbon post in 27.2 (nothing wrong with it at all) and a shim, but I can't get it to stay put. It is always slipping down on a ride until it bottoms out on the bottle boss. Yes, I tried carbon paste too. The original post from Kuota had the ridges stripped that held the saddle and the saddle wouldn't stay with that one. So I went on ebay and lo and behold an original Kuota was up for cheap. I bought it but my concern is it will have the same problem as my original. We'll see.

I'll use the Chinese carbon post on my commuter as an upgrade. It won't make any difference in the ride but what the hell, it's carbon.