This ad appeared in the November 1989 issue of “Go”. I dont have earlier issues from 1989 so Im not sure how long it was running. The ad is for a “New” model the complete CR20S. The frame set was sold as CR20. The bike complete with high end parts like the GT 3 piece alloy cranks is the CR20R. This new CR20S is a complete bike but with less expensive parts group. But note the bike in the ad still has CR20R decals. Click on the picture to see it larger.
So it is pretty clear the CR20S is probably a 89 model.