glueman wrote:. I s'pose I was wondering if 631 is 'inferior' to the old 531 and is it lighter or heavier.
631 is the direct replacement for 531. It is the same in all respects except it's easier to weld.
Don't know anything about 653
It's no longer available, superseded by 853, which again is easier to weld.
My Mercian in 531ST is great for camping but is kitted out as such and a little on the lardy side
The relevant part of that tubeset is the ST rather than 531.
ST = Super Tourist = heavy gauge.
Reynolds no longer offer tubesets leaving the builder the freedom to mix and match.