Originally Posted by
Charles Wahl
It's odd that a Reynolds 531 frame would take a 26.8 mm seatpost. Usually 27.2 for English (28.6 mm OD) tubing, and 26.6 for French (28.0 mm seat tube OD).
The Trim Trophy and Cross Trophy frames are build with 531 plain gauge main tubes (other tubes are ??? hi ten or something similar). That explains the 26.8 seatpost diameter.