Modern verus 70/80s frameset weight
 

versus*

So I've been looking at a lot of modern TIG welded fixed gear bikes while also keeping my eye on CL for a bike to convert.

My current late 70s Raleigh conversion is too heavy. I'm not sure how the weight is distributed, and I used the original 27" Arya rims, so that probably didn't help. My sis has a steel Pista from the last few years that I think is all stock and the weight on that is great (just not the toverlap).

What kind of frameset weight difference would I be looking at between something like a Steamroller or Kilo or whatever double butted 4130 frame and the average road bikes of the 70s or 80s such as these:

http://portland.craigslist.org/mlt/bik/1682971249.html
http://portland.craigslist.org/mlt/bik/1683619733.html
http://portland.craigslist.org/wsc/bik/1684880939.html

Also, is there any way to tell a frame is double/triple butted my examining the frame itself (aside from frame labels/tags)?

cheers!

Moving to Framebuilders from SSFG.