Dumb newbie Kona/Project 2 question

I'm sure someone will correct me but I think they definitely went 1"1/8 in 1991 and probably ahead in 1996/97
 
My 1992 cinder cone is 1.1/8th

Not sure about the change from threaded ➡️ A-head but probably close to Skeelsie's suggestion i'd say, if not slightly earlier .
 
Ahead all models from 1997, 1 1/8 top models I think was 91, lowest two models may have been 94, not before.
 
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