Originally Posted by
T-Mar
Yes, hopefully you're still following this thread. Based on the components and serial number it should have been manufactured around the end of August 1979, which makes it late enough in the year that it may be a 1980 model. To detrermine the tubing, we;d have to know the dameter of the seast post. Given the era and level of components, it is most likely plain gauge CrMo.
T-Mar, your knowledge of Japanese steel (and much more I'm sure) never ceases to amaze me. I replaced the SR LaPrade seatpost with my Stronglight when I first got my Shogun. The Stronglight is a 26.2. The exact tubing is really irrelevent, but any new info is always appreciated. The binder bolt is closed completely to clamp the 26.2 and my guess is the SR was a 26.6 or 26.8. Thanks, PGMikeT