Thanks! Yes it now has a 12-24 Shimano cluster, I really don't need anything more here in Indiana, if I have to use the inner ring I consider it failure! The rest of the bike is a bit of a mish-mash anymore. Wheels, crank, FD, DT shifters and seatpost are original. I can't remember if it came with 105 brakes, I might have upgraded from Suntour but frankly can't remember . The RD is some type of Shimano mountain bike thing that my crappy bike shop sold me back in the early '90's with the cluster. If I could find an original Suntour RD I'd throw it back on in a second! The seat isn't original, in fact that saddle isn't even on the bike anymore (finally wore clean throught the leather to plastic), it now sports a Specialized Alias.

I don't know of any groups for the Sirrus but there are a couple of threads in the C&V forum.