Originally Posted by recursive
Well, the most important thing would be reducint aerodynamic drag, since at that speed, the drag is gigantic.
And a hill. You'll need a big ass hill.
And brakes. You'll need brakes.
That's pretty much it.
You will be surprised to find you don't really need a huge hill. Of course this depends on what you consider a big hill. Around me I regularly hit 40MPH descending 6% grades that are about 1/4 mile long.