Chuckk, I'm sure the '94 info is a typo/misprint.
OldsCOOL, Thanks! The down tube on my '86/'88 is 1.74". Once it's built I'll check the head tube's angle as it maybe a RR frame, which is fine by me, I do wish I knew why it took two years for the frame to come to market as an '88 SR500. A hint is that there are three signatures on the drop out. The down tube on the '89 is 2.0", BTW.
Brad