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  1. #1
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    wow


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    Approaching Nirvana megaman's Avatar
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    That is fast. I just don't feel video does it justice. I would have had to be there to really appreciate that kind of speed.
    "The difference between genius and stupidity is that genius has its limits."
    -- Albert Einstein

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    Senior Member Rogerinchrist's Avatar
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    Dig that sound!!

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    That's a truely awesome video, thanks for posting that!
    Hello :) Come visit my BLOG at www.bentupbike.blogspot.comwww.bentupbike.blogspot.com

    2005 Burley Sandpoint
    2005 Dahon Piccolo

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    Amazing. And the record for an up right bike is 47 or 49 MPH and it has not been broken in about 20 yrs:-)
    Mark

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    I wonder what makes that noise? Do you suppose it is the chain on the cogs? Then other bikes did it also.

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    Insane Bicycle Mechanic Jeff Wills's Avatar
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    Quote Originally Posted by Torque1st View Post
    I wonder what makes that noise? Do you suppose it is the chain on the cogs? Then other bikes did it also.
    I was there.

    It's the tires that make that hum. Sam goes so fast and is otherwise so smooth that the tires give off a distinctive hum. Other bikes do not sound like this, and besides, the drivetrain is completely enclosed.

    That evening was absolutely perfect conditions for a record run- it was about 80 degrees and the wind was fairly calm for a couple hours beforehand. Usually it's pretty blustery until about 5:30PM, then the wind dies off. That day it was quiet most of the day.
    Jeff Wills

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    The other bike videos on the page where this one was all have the same noise, differing frequencies tho, probably related to speed.

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    Insane Bicycle Mechanic Jeff Wills's Avatar
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    Quote Originally Posted by Torque1st View Post
    The other bike videos on the page where this one was all have the same noise, differing frequencies tho, probably related to speed.

    I guess you had to be there.

    The sound that Sam's Varna (and Freddy's, too) is distinctive. It may be that it's part of all the sensations that go with witnessing all of them go by. The sound, though, goes something like this:

    Larry Lem / Tom Amick in the Goliath II : WhiiiirrrrRRRRRrrrroooo
    Warren Beauchamp in the Cuda-W : WhiiiirrrrRRRRRrrrroooo
    Barclay Henry in the Black Trike: Whhhiiiirrrrrrrrr
    Ron Layman in the Primal: Whiiiirrrroooooorrrroooo
    Aaron Williams in the Athena: WhiiiirrrrRRRRRrrrroooo
    Sam Whittingham in the Diablo III: SsssssssoooOOO WHOMPP!! ooooooooo
    Fred Markham in the Mephisto: SsssssssoooOOO whompp! ooooooooo

    I know that Sam "only" did 1/10 the speed of sound, but there's a definite shockwave when he goes by. Maybe it's the massive intake of breath from the spectators.
    Jeff Wills

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    Being familiar with machines of many types the noises were all similar. I think it was chain and sprocket noise, not the tires. No matter what made it, the noise represents an energy bleed.

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    Insane Bicycle Mechanic Jeff Wills's Avatar
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    Quote Originally Posted by Torque1st View Post
    Being familiar with machines of many types the noises were all similar. I think it was chain and sprocket noise, not the tires. No matter what made it, the noise represents an energy bleed.
    The pavement at Battle Mountain is pretty bad. Not chipseal bad, but well-worn bad. I know what chain and sprocket noise sounds like (heck, I spent 5 years working in a bike shop) and that's not what I hear when a Varna goes by.

    I agree that the noise represents lost energy. That's why I'd like to see an alternative event held near Burns, Oregon. Same altitude, same weather, extremely smooth pavement. Sam reported that the ride was so smooth that he was discovering all sorts of "new" problems- but they were things that he could never hear before.
    Jeff Wills

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    Interesting... My experience does not include a bike shop. But it does include lots of chain drives under power. The rollers hitting the sprocket make a similar noise.

    My bike experience is all shade tree except for 4 years in a real old fashioned "service" station where we fixed kid's bike tires for free and the kids knew it. I started the "bike service" when a kid filled his own tire like he saw us fill car tires and blew it up. The boss liked the idea of always filling them ourselves and/or with supervision so it became policy. He was an old softie and did not want to see a kid hurt. You would be surprised how many $ from regular customers that saw us fixing bikes flowed into the patch fund. We were sort of a bike "teaching hospital". The kids could watch us repair their tires and we always explained every move we made and why. Once they had seen it done a time or two they got to help... We also made adjustments and lubrication. The bike shop down the street about 5 blocks probably hated us but they charged the little kids just for looking at a bike. Parents would come in and have their cars serviced or filled and thank us. It was good advertising on our part.

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    That blows my mind. I can't imagine 81 mph. I've gone 38 mph on my Sun EZSport...down hill. That's plenty fast enough for me.

  14. #14
    Senior Member BlazingPedals's Avatar
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    Not to take sides, but to me it sounds like tires on rough-textured pavement. It even drowns out the normal hollow 'whoosh' that streamliners usually make.

  15. #15
    Senior Member Rogerinchrist's Avatar
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    Quote Originally Posted by BlazingPedals View Post
    Not to take sides, but to me it sounds like tires on rough-textured pavement. It even drowns out the normal hollow 'whoosh' that streamliners usually make.
    I would agree.

    Open a car window & shut off the engine (while in neutral) the tires will make noise while at some speed.

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    I have ridden a bike and coasted at some speed. 35+ over rough pavement and smooth both asphalt and concrete. I have also coasted in a vehicle at high speeds. The large auto tires with a more aggressive tread and a large footprint make noise, the bike tires just make a hiss with a buzz from the freewheel. Of course vehicles with a very aggressive tread make a huge amount of road noise. Listen to one of those lifted trucks... I still think the major noise is chain noise having heard it first hand on my own bike, and machines without tires or engines, just motors. Unfortunately that noise represents an energy bleed. Has anyone ever used a belt drive for a high speed run? A belt makes a similar noise but much more subdued due to an elastomer impacting the sprocket rather than a hard steel ring.

  17. #17
    Insane Bicycle Mechanic Jeff Wills's Avatar
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    Quote Originally Posted by Torque1st View Post
    I have ridden a bike and coasted at some speed. 35+ over rough pavement and smooth both asphalt and concrete. I have also coasted in a vehicle at high speeds. The large auto tires with a more aggressive tread and a large footprint make noise, the bike tires just make a hiss with a buzz from the freewheel. Of course vehicles with a very aggressive tread make a huge amount of road noise. Listen to one of those lifted trucks... I still think the major noise is chain noise having heard it first hand on my own bike, and machines without tires or engines, just motors. Unfortunately that noise represents an energy bleed. Has anyone ever used a belt drive for a high speed run? A belt makes a similar noise but much more subdued due to an elastomer impacting the sprocket rather than a hard steel ring.
    The other bikes make that sibilant hiss as they roll by, too. The difference is that Sam is doing EIGHTY TWO POINT THREE MILES PER HOUR. He's also rolling on some very nice sew-up tires, which resonate differently than more usual clinchers.

    If your chain is making noise when you're pedaling, it's probably worn or lacking lubrication or both. My bikes are silent when parts are new or newly lubricated, growing progressively noisier as they age and accumulate gunk.

    Belt drives have been tried, most notably on Matt Weaver's Cutting Edge II:
    http://www.speed101.com/images/cutti...I/IMG_2337.jpg
    http://www.speed101.com/images/cutti...I/IMG_2306.jpg
    (belt drive parts visible on the left side of the frame)
    From: http://www.speed101.com/gallery/cutt...eII_june22.htm
    Unfortunately, belt drives aren't compatible with derailleur-style gear changing, and roller chains are 90 to 95 percent efficient. It's very hard to come up with an overall better drive system than a conventional bicycle chain.
    Jeff Wills

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    Roller chain always makes noise even new and bathed in lubricant which is why they have "silent" chain but silent chain is an entirely different device. Some of the major manufacturers also have low noise chain but it is still not silent.
    Last edited by Torque1st; 10-16-08 at 12:49 AM.

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    Insane Bicycle Mechanic Jeff Wills's Avatar
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    Quote Originally Posted by Torque1st View Post
    Roller chain always makes noise even new and bathed in lubricant which is why they have "silent" chain but silent chain is an entirely different device. Some of the major manufacturers also have low noise chain but it is still not silent.

    I don't know what you're doing to your chains, but my bikes are silent, particularly the single-speed and the fixie.
    Jeff Wills

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    Roller chain ALWAYS makes noise. It is the nature of the beast, if you think it is silent you need your hearing checked.

  21. #21
    Senior Member BlazingPedals's Avatar
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    Quote Originally Posted by Torque1st View Post
    Roller chain ALWAYS makes noise. It is the nature of the beast, if you think it is silent you need your hearing checked.
    Yes, but his chain is enclosed inside a carbon/kevlar/foam shell. It absorbs sound very well. Chain noise, however much there was inside, would be muffled to the point of being insignificant to an observer on the outside.

  22. #22
    Senior Member EnigManiac's Avatar
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    I go that fast on my urban commute ride every day on my BikeE AT...ok, maybe I'm a little slower.
    The slow down is accelerating

  23. #23
    Uber Goober StephenH's Avatar
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    They're probably running knobby tires in case they hit a mud patch up there.
    "be careful this rando stuff is addictive and dan's the 'pusher'."

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    Insane Bicycle Mechanic Jeff Wills's Avatar
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    Here's a couple more vehicles:

    The Orion trike
    http://www.vimeo.com/1892372
    http://www.vimeo.com/1892418
    The Goliath back-to-back tandem (two drivetrains, twice as many chains)
    http://www.vimeo.com/1898550
    The Speedhawk
    http://www.vimeo.com/1991518
    Jeff Wills

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    Senior Member DannoXYZ's Avatar
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    Sew-ups definitely have a "ripping fabric" sound to them due to the supple casing. If you've ever used sew-ups, you'd recognized that sound at speed in a second.

    What kind of gearing was he using? Does that bike have the standard drivetrain with derailleurs?

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