Wow that is FAST!!!!!! My max speeed is "only" 40.2 mph.
At that speed I am "not" pedaling!
I weigh less than my DH and we ride the same model bike (mine is a bit smaller), but I pass him on the screaming downhills when neither of us are pedaling at all and both in similar posture- I can't quite figure it out- any ideas why? Of course, he then blows me off on the uphills!