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edscoble-
Thanks ed.
The lug was definitely sqeezed, in the end i could put the 27.2 seatpost in while widening the lug with the help of a screwdriver.
So if my guess with the 531st seattube is right, Tony Oliver is also right - guess the Roberts is silver brazed, so another 531st with 27.2 diameter here.
The Roberts rides really really nice btw.. Will post some pictures if it has been converted from its ugly trekking-ness to drop bars...
Thanks everyone...cheers.
multibur_st
There are no stickers on the frame, probably it is a special selected mixture of Columbus and Reynolds. I assume also that there is some 531st in there, first thoughts would be seattube, that's why 27.0 is also an option.
But I also thought the lug would have been squeezed, so tried the trick with the screwdriver and i can fit the seatpost in, allthough with a little work...
Just btw and probably a little bit of stupid question, how can you tell if you inserted a to big seatpost?