Images by Oli Woodman, IHPVA & Fred Rompelberg
Earlier this week, we picked up on Sam Pearce’s Loopwheel, which was unveiled at last month’s Bespoked Bristol show (generally regarded as UK’s response to NAHBS), for which Pearce is currently seeking fundingvia Kickstarter. Tom Donhou’s booth was another standout from the third edition of the show—thoroughly documented in a photo gallery on Bike Radar—specifically, his head-turning fixed-gear, built expressly for speed.
Photo by Oli Woodman
Indeed, Donhou is stepping up to the plate, so to speak, in an attempt to break 100 mph on a relatively standard diamond-frame bicycle. The disc that vaguely resembles a chrome pizza is, in fact, a 104-tooth chainring—roughly twice the size of the standard 53T big ring on most cranksets—custom fabricated by Royce. (Assuming the cog is somewhere in the 12–15ish range, Donhou’s contraption is geared at an astronomical 200+ gear-inches; for reference, Wikipedia notes that “a gearing in gear inches the same as a person’s height in inches is a comfortable gear for riding on the flat.” In other words, the obscene gearing would be comfortable from someone no less than 16’8”.)
Image via the Telegraph
Donhou admits that he was somewhat chagrined by early press that misrepresented his machine as a contender for a world record, he set the record straight in Road.cc
I’m really into land speed record stuff, in the 60s when the guys were battling it out down on the salt flats almost doubling the speed limits in a couple of years, I love all that stuff. I know a bit about cars but I could never afford to take a car over there…
So I built this with the intention to feel it out, I don’t know how fast it can go, that’s my best guess as to what I can do. I built the bike how I thought it should look. No wind tunnels involved, it’s all grassroots, it’s done in that spirit of those guys in the 60s testing jet engines in their sheds. It’s that spirit. We’ll see if we can stay on it if we get up to 100mph. We’ve tested it up to 60mph.
Photo by Oli Woodman
Donhou is confident that he can break triple digits, though he acknowledges that the effort is something of an ad hoc endeavor: although my fellow cycling enthusiasts know that Columbus MAX tubes are among the best available, Donhou has been booking a decommissioned airstrip as weather allows; a modified Ford Zephyr serves as the pacecar. As he told the Telegraph, “What started as just a bit of fun started to get a lot more serious pretty quick and now we’re gunning for 100mph. It’s just been really DIY, there’s not been a load of money put into this.”
The dropped bars are also pretty intense, though these have been de rigueur for pursuit/TT bikes for decades. Photo by Oli Woodman
(more…)
Hideaki Iida
Marcus Classen
Michal Vlcek
Ki Kim
Jungwook Jay Lee
Nir Siegel
Qiannan Wang
Shihan Pi
Ewan Gallimore
