Originally Posted by
balindamood
T-Mar or others-
I recently came upon a Japanese made '87 Bianchi Sport SX, Ser#AS718273 (on the seat tube), Suntour alpha-5000 components. I am interested in knowing more about the frame geometry (beacuse I really like this one) and more about the "Bianchi Superset" Tange double-butted tubing.
Thanks.
Superset refers to a mixed tubeset, typically with a heavier gauge downtube and chainstays. In this case, I believe it's a mixture of Tange 900 & 1000.
The Sport was an upper entry level model with sports/touring geometry. Geometry will vary depending on the size, but suffice to say that the seat and headtube angle will be a slacker than a racing model of the same size. Also, there's more rake and a slightly longer wheelbase and chainstays. All this is meant to make it more comfortable and less twitchy than a racing bicycle. However, it is more sporty that the boom era sports/touring models. It's well suited to long, fast, day rides and the occassional triathlon.