Fred Rompelberg's Absolute World Speed Record Cycling.
On 3 October 1995 he cycled behind a motor dragster on the Bonneville Salt Flats in Utah, with a speed of 268.831 km/h.
He was the oldest professional cyclist in the world at the time. This is still a world record...
en.wikipedia.org/wiki/Fred_Rompelberg
A bicycle with a motor on it - is no longer a bicycle.
Might as well be called a light-weight motorcycle.
I think the true cycling speed record on a flat is held by Jens Voight
Google tells me the fastest bicycle is the VeloX3, pedalled by Sebastiaan Bowier en.wikipedia.org/wiki/Sebastiaan_Bowier at 133.78 kph. On a flat surface unpaced!
meh, who cares if it is a bicycle or not.
He put a rocket on it and rode it!!!!!!!! 
Select to expand quotegrumplestiltskin said..
Potential Darwin Award
You're not wrong. He went to the trouble of making a light frame and it failed. Weight doesn't matter for a downhill run like that.
Select to expand quoteLoftywinds said..
I think the true cycling speed record on a flat is held by Jens Voight
not anymore; Jens held the hour record for about six weeks........
Select to expand quoteSkid said..
Bicycle, or jet powered motorbike?
Still pretty cool though...
I think 'power-assisted pedal cycle' is what you are looking for, but itneeds a set of spokey dokes though, when they stop rattling you know you are going really fast 
Select to expand quoteshi thouse said..
No pedalling or jets here, just downhill...most of the way. 
Well that's what you get for not riding down hill in a Australian made Hillbrick Bicycle.
At least he got a mouth full of volcanic ash. Good for the skin and dietary system. 
Select to expand quoteLoftywinds said..
A bicycle with a motor on it - is no longer a bicycle.
Might as well be called a light-weight motorcycle.
I think the true cycling speed consumption while riding record on a flat is held by Jens Voight
Hahahaha! being cycling is it measured in grams per hour????????
Select to expand quoteHaircut said..
be handy zipping to work. acceleration looks awesome
Spoke with a guy who was riding one around Adelaide. The power is amazing and he used it to climb mountain bike trails for downhill riding. But the main feature is the quality of the suspension, which he claimed took an 8 foot vertical drop to bottom-out.
