>>1720991here in the frame part of the rabbit hole
looking only at the main triangle 9-6-9 is about where touring bikes start, and is on the light side of things for an MTB
Columbus SL and some grades of Reynolds 531 (BB122) are somewhat like this as is the top end of Tange MTB tubes
but most tube sets are available in many different Outer diameters and profiles, so you have to dig a bit to see what you are looking at
to my eye the weight difference between the lightest and heaviest tube set does not look like much
and the weight changes again depending on what lugs and drop-outs are used
