Re:
Cheers Davidj.
The frame I’m working on has an odd-ish 30mm seatpost diameter with a 34.9 seat clamp. The Thomson post I’ve got is frustratingly 0.9mm too big but a 27.2mm will fit with a shim.
I get the frame back from the paint shop tomorrow and I’ll double check to length I need on the post.
Thanks for the clarification, much appreciated.