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    New cycling speed record of more than 174mph
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    Something different from the old music threads....




    https://www.theguardian.com/lifeands...re-than-174mph
    Last edited by Conor Dary; 08-19-2019 at 07:52 PM.
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    #2
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    Note that the article says he set the men's speed record. The world record is actually held by a woman - 183.9 MPH, set in 2018.

    http://theprojectspeed.com/
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    Quote Originally Posted by guru View Post
    Note that the article says he set the men's speed record. The world record is actually held by a woman - 183.9 MPH, set in 2018.
    http://theprojectspeed.com/
    I'm not understanding the physics there. Is she being sucked along by some wind vortex? She is obviously not pedalling that fast.
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    #4
    Quote Originally Posted by Atticus View Post
    I'm not understanding the physics there. Is she being sucked along by some wind vortex? She is obviously not pedalling that fast.
    No. She doesn't have to pedal super fast because these land speeds have a dual set of big rings, unlike a regular bike with a single big ring. So a Tour de France rider may ride a big gear of 54 x 11. But the land speed bikes are something like (50x12)x(50x12) or effectively, something like 215x12. The gearing is so big that the rider can't actually get it started by himself, hence he must be towed by the car to get the wheels turning up to a certain speed. The rider is then released from the tow and pedals on his/her own at that point. The huge gearing lets them reach enormous speeds while still only having to rev at about 100 rev/minute.
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    #5
    Quote Originally Posted by bambam1729 View Post
    But the land speed bikes are something like (50x12)x(50x12) or effectively, something like 215x12. The gearing is so big that the rider can't actually get it started by himself, hence he must be towed by the car to get the wheels turning up to a certain speed.
    When I saw a video of one of those records and found out that the car did most of the work of getting the bike up to speed by towing the cyclist to above 100 mph, I was not impressed. Drafting is one thing, but getting towed? Meh.

    Yeah, I know I can't do it. I also couldn't run a sub-2hr marathon if a car towed me for 25.5 miles, but somebody doing that wouldn't impress me either.
    Last edited by 18.99s; 08-19-2019 at 10:39 PM.
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    #6
    Here's a picture of the bike ridden by the Dutch guy back in 1995. Note the double set of big rings.
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    You don't have to pedal that fast....it's a HUGE gear....204x11!

    Mueller used a 60-tooth front chainring going to a 13-tooth cog on a Jackshaft that was supplied by da Vinci. The Jackshaft transferred to another 60-tooth chainring going to a 12-tooth cog on the rear wheel. This combination yielded the equivalent of a 204x11 road gear without the need for a chainring that would have scraped the ground, which would have been the case with a traditional chainring-cog drivetrain! This top gear was more than four times larger than the 52x11, which is the biggest gear on a standard road bike.

    https://www.bicycling.com/bikes-gear...breaking-bike/
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    #8
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    A 204x11 gearing means the rear wheel rotates 18.5 times for each turn of the crank .
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    #9
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    I remember first reading about these insane bicycle speeds in the '60s, and the article said the biggest problem they had was in finding a car that could reliably travel as fast as was required!
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    #10
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    Quote Originally Posted by gh View Post
    I remember first reading about these insane bicycle speeds in the '60s, and the article said the biggest problem they had was in finding a car that could reliably travel as fast as was required!
    I found a reference to the article I read: was in the June '62 edition of TRUE Magazine.

    It's referenced here.

    https://www.sandiegoreader.com/news/...culated-risk/#
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