I just picked up a 92 950 frame and looking at the bottom bracket it has 990 18 stamped on it, and it is an 18” frame. I just checked my 1991 990 and it has 990 22 stamped on it as it is a 22” frame. For some reason I thought there was a difference between 990 frames and lower models in the 9xx series.

I am to assume all 9xx series frames are the same, or did I just get lucky and pickup a 990 frame that was decked out in 950 trim from the factory?