Tom Donhou, who builds bicycle frames in London, observed that it’s quite possible to do 60 mph on a bicycle if you have a steep-enough hill at your disposal. Well, been there, done that. But what I did is not a patch on Donhou’s accomplishment with a custom machine — basically one of his stock frames, slightly shortened, with handlebars dropped and a 104-tooth chainring — and an aerodynamic boost based on the time-honored principle of drafting.
He made it up to 80 or so before running out of road, and by “road” we mean a two-mile runway that hasn’t so much as a hint of grade. A test on a dyno suggests a possible speed of over 100 mph.
This isn’t the fastest anyone’s ever been on a bicycle — Fred Rompelberg once knocked out 167 mph over the Bonneville Salt Flats — but for what is essentially backyard engineering, this is a remarkable achievement.