I'm not sure exactly when the Sirrus was introduced. The oldest reference I have for it is 1987. At that time it was a CrMo butted framest (tube wall gauge equivalent to Columbus SL), Shimano 105 equipped and $449 US. Still had two sets of bottle bosses and a pump peg, though the frame was slightly steeper with 74 degree angles. Other than the angles, it looks like very little changed excpet for incremental developments in the 105 group (i.e. 6 to 7 speeds, Hyperglide, etc.).