Not going to crow- and it was on a Tandem- I was at peak fitness and the pilot was up for it. 45mph on the flat and we were still pulling on the pedals. It came to a sudden halt when the lungs gave out on the pair of us. Cadence of 150 finished us. and I have never got anywhere near that speed since.

And on a road bike- Boreas of course- I have a flattish route that I normally show a top speed of just under 30. May be down a slight slope but can't be far off my Max.