Yeah mate, that was according to Frank (754) but I don't know for sure. I've done 40 MPH on a Hybrid (mountain bike/road bike cross) down a steep hill on a paved road, that was fun until I got a "speed wobble" going, but when we go on the salt my cuz (who's about half my weight) will be the "pilot", and I'm hoping to convince him to do it butt naked, aka Rollie Free, or maybe in one of those Olympic swimming costumes, to reduce the drag, don't cha know......... 
Thats it??
I used to own a carbon fiber Trek Y frame bike with skinny azz tires aluminum everything else almost.
I had modified the rear gear hub to have 3 gears, and the front had only 1 gear, a 62 tooth.
First gear for in town, 2nd to pass other bikes, and 3rd was *oh my god you better be going down hill*
On 287, theres a spot (??Virginia Dale??) between Ft. Collins colorado and Laramie wyoming has 1000(?) ft drop in a WAY short time, have passed cars doing 55 several times on it.
Sold that bike after i laid it down doing around 60+mph....Thank god for body armor/gloves and helmut.
Somewhere around 50mph the spokes would "sing"... hard to match that sound to anything... singing is the only explanation i can come up with.
Awesome though.
And as to motors??
I have a custom bike I made(all chromolly tubing) that I had a 25cc weed-eater motor on it.
Used to buzz around to and from work on the sucker.
25-30mph was all the motor could do on it's own.
But with me pedaling as well, easily 45+mph.
!!Got a 43 in a 30 zone ticket once!!
Cop tried to get me for no registration, no plates, and no insurance...
Until I went to court, and brought documents proving I only needed insurance registration and plates on anything over 50cc's.
But nonetheless I had to pay the speeding ticket.
HAHAHAHA... the look on the cops face in the courtroom was PRICELESS!!!!!!!!!!!!!!!!
Still have the motor, bike, and gearbox i used, but an accident(got forced off the road and motor would not die, ended up cracking the mount frame the motor was on) killed the mount frame for the back of the bike.
My son rides the custom bike now. Sans motor though.(he's dangerous enough on his own)
It was AWESOME on gas millage, 160 minimum mpg on average(low was about 140mpg), with me pedaling I hit 190ish mpg once.
Gotta hook that motor/gearbox up to another bike again one of these years...
That bike was FUN!
But the only downside was when people would ask me about it, if i would sell it or make them one, filling up ended up in 1/2 to 2 hour conversations at times.
However filling up for like $0.32 was worth it.(held like 1/5 or 1/4 gal), loved payng for 2-3 weeks of gas with change from the couch cushions!
Stock motor wise, and worm drive reduction gearbox, everything else was truly custom made by me.
Even had electric start!(stock for the motor)
I have the motor I ran, and one i never did re-assemble after having it hopped up by a old foggie who used to race 2 stokes back when he was younger.
Mabey I should re-hook it up, finish the little fairing project i had going at one time, and see what it'll do out at bonneville salt flats.
Dunno though, bike has NO suspension. but as long as it is, it feels like it does.
l8r
