Another exciting day. In response to an ad I placed, I got offered a F-F-T Bianchi of a type I was unfamiliar with. It is a 1988 (?) steel framed "Super Grizzly" with a complete Deore XT group. I checked it out by riding it and found that the bike is actually pretty good for its age. There are three slightly oval Shimano BioPace sprockets - 48 X 38 X 28 teeth, and the largest sprocket looks like it is worn. See the pictures, especially the last one.
What are the odds that I can find a replacement for the 48-tooth sprocket or the whole set ??
Are these BioPace things totally unobtainable ??