Originally Posted by
supergymnast
so seatpost is 25.4 mm.. just as Neal was saying the earlier raleighs had with possible straight gauge reynolds 531 tubing.
I don't think that Reynolds straight-gauge 531 would have taken a seatpost that small.
28.6 - 25.4 + .2 (for clearance, typ.) = 3 mm. That means that the tubing would have to be 1.5 mm thick. That's way thick for 531, which at the butted ends is either .8 or .9 mm, as far as I've ever seen.
The Falcon I keep rattling on about has seamed tubing, and from the weight, I assume that it's not butted either; but it takes a 26.6 mm seatpost nonetheless. You have to go to high-tensile tubing, or French tubing sizing (which Reynolds made, 0.6 mm smaller diameter, both OD and ID) to get to the really small seatposts.