Brucey wrote:jimlews wrote:A plain gauge seat tube is quite often used on a small size frameset.
Reynolds used to make the thinner centre section of the tube to a standard dimension, such that with a small size frame, the seat tube would have had to be trimmed below the thicker butted ends, thus weakening the frame.
To avoid this, a plain gauge seat tube would have been substituted.
traditionally, in a lightweight tubeset, seat tubes are single butted, and can be trimmed to any length in a lugged and brazed frame.
Tubesets which are designed for welding are a different kettle of fish though; they can be externally butted at the top, for example.
Thanks for the correction, Brucey.
I should have known that.
Actually, I did.
I blame the Sherry Trifle, myself