50 odd mph, and frankly it's too fast enough in good conditions, and waaaaaay too fast in most conditions, for the average Joe at least IMO.
Even on a descent these days I control things too aound 40mph max.
Guess I'm getting old
FTFYThats what led to the Q in the first place, I know I was on a borrowed bike but I was thinking as I was descending "if I come off now, THERE'LL BE NOWT LEFT TO PICK UP !!!! " it really did seem to fast