Got a new 26er scandal frame from on-one, and started to build it up. Put the seat post in and was a bit surprised that it just dropped freely in the frame. Pulling the post to a sensible height it is clearly free to wobble in the frame. every other bike I've owned has had a smug fitting between post and tube. So I checked the post diameter with callipers, and it's spot on, 27.2 mm, and tried another post, with the same results. Checked the internal diameter of the seat tube and it's 27.5 mm.
Went back to on-one who arrange to pick up the frame. Just had a mail from them saying that yes the internal diameter is bigger than 27.2, but the reason the post wobbles is that I've put it on too far so the end of the post is in a bit of the tube which is wider.
I had noticed the tube widens about 4 inches down, but can't help thinking this is just an excuse- holding the post at its Max extension point the wobble is even bigger. If the tube were the correct size surely there would be no wobble with four inches of post being held securely even if it were shoved a long way in. Fnar.
Anyway, on-one reckon the frame is 'within tolerance', but I still think the post should fit snugly, or there's a greater risk of frame or post failure. I'd heard good things about on one's customer care, but feel like I'm being fobbed off.