I guess you get used to what you ride.
Tallest rider I ever saw win 80 Expert was that Suzuki rider who does jump tricks, now autocross racing. X games multi winner. He was my height and riding and winning in 80's.
JeffWard was about 4'8" when he got his Kawasaki factory sponsorship. The seat height on his 125 must have been 39". He used a milkcrate for starts, and had Dad pushstart the bike for him.
RickyCarmicheal, no matter what Suzuik/Kawasaki said, was no taller than 5'6".
Tallent trumps whatever god gave us.