Well not a trans athlete, Lael Wilcox just set the fastest known time (male or female) in the of the Arizona Trail in nine days, eight hours, and 23 minutes. Unfortunate that won't be officially be recognized as she had a media crew (including her wife) documenting her ride. Very impressive
https://www.velonews.com/news/mountain/lael-wilcox-completes-fkt-of-the-arizona-trail-in-nine-days-eight-hours/
Full disclosure, when I wrote the post above I had Lael in mind. She's an absolute beast on a bicycle . . .