I just sold a Raleigh Super Record from the 70s to a fella, and noticed when I rode it over to him that it was actually pretty light. (It had a chrome rear wheel and an alloy front). The tubing was labeled "High Tensile." But what was really interesting to me was that even though it's a 22" frame, it was still significantly lighter than a 21" Miyata w/ a Hi-Ten frame that I'm also selling. Are these not made of the same kind of tubing? The tubing on the Raleigh was also kind of skinny for "plumber's pipe," I thought. So what gives? Are there in fact different grades of High tensile tubing?