Hit 83 km/hr coming down Mt Ventoux this summer. I was on a box-fresh €10k rental bike (pic related) which started speed wobbling at 80, it was fucking terrifying tbqhwy.
I also hit 80+ according to Strava when I got new tubeless/wide wheels, on a segment named "here be pinchflats", which is bretty gud.
GCN interviewed a few pros about the highest speeds they'd hit. Cav said 128.
https://www.youtube.com/watch?v=pT2MwG9gMgI