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  1. #1
    Senior Member
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    DIY Goldsprints - Anyone w/ experience?

    So, lets just say that hypothetically and all that my roommate and I are total bike nerds. And we both have track bikes. And rollers. And we have friends with rollers. And we'd like to race on them...

    Does anyone have any experience with a DIY Goldsprint setup? We need some sort of readout so we can each tell the others distance/speed. Mechanical with a belt on the opposite side of the rollers would work, as would an electronic system via a laptop. Either avenue would work for me...

    Anyone out there? I know there are nerds on this board who may have already completed such a project.

    -brad

  2. #2
    cxmagazine dot com pitboss's Avatar
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    Hey - If no one responds, check with RELoad as well as the TrackstarNYC family. I am sure there is a wealth of experience at those two houses.
    Deathlap - cyclocross, training, beer,...escape hatch

  3. #3
    make way for the MGL MLPROJECT's Avatar
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    aren't the computer programs and equipment that most of them use around a G?

  4. #4
    Back to being a Clyde.... ZappCatt's Avatar
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  5. #5
    Good Afternoon! SamHouston's Avatar
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    These guys might shoot you back an email if yer nice. Hell throw a big goldsprints party in pittsburgh is fun.

    http://www.r-evolution.cc/site/index.php
    http://www.goldsprints.com/

  6. #6
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    Quote Originally Posted by MLPROJECT
    aren't the computer programs and equipment that most of them use around a G?
    Thats the point. I think it can be done for pennies... Even electronically.

    In school we worked with various rather inexpensive light gates and simple computer programs to measure speed/size/quantity/whatever. Shouldn't be too terribly hard to wire up a system and plug it into a USB port, or get all old school and use a serial or parallel port. I've contacted an old computer engineering friend from school, so we'll see if he can help me out with the programming end of things... I figure we'll each remember enough of our electrical circuits classes to wire up the gates.

    Or build something mechanical, with a big gauge that spins on it and two arrows or something.

    Something that isn't going to cost a thousand dollars.

    -brad

  7. #7
    i am sure that i hate you spud's Avatar
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    cyclocomputers are cheap, disassemble a couple and link em to a big(ger) LCD
    putting the pi back in pirate!
    Itís an upstanding member of the solar system
    Apply the laws of earth and make it a victim
    Of Proposition 187

  8. #8
    The King of Town manboy's Avatar
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    I have no idea what this thread means.

  9. #9
    ya'll can't mush me vomitron's Avatar
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    The way I saw it done was with two cyclocomputers on the rear wheels. You just have someone standing behind each rider and a hand gets raised when a specific distance is reached.

    Now, that's obviously the most low-tech you can get save counting revolutions of the wheel manually. If you have enough EE experience, it would be trivial to make one yourself using a laptop as the logic processor. Just wire some magnets to a serial/USB port and count the number of revolutions. Use sheldon to figure out meters development and just set the number of revs to count before beeping, or something. Should be relatively simple to do. Release the source on the intarweb!

  10. #10
    Iguana Subsystem dolface's Avatar
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    what about this? a wireless cyclecomputer for each bike. line the the receivers up in a row with a video camera on them, feed the output from the camera to a pvr/vcr to a tv, and you're pretty much set.

    it won't beep or anything, but if the races are close just play back the recording, and it doesn't take any soldering.

  11. #11
    Senior Member Terror_in_pink's Avatar
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    two trainers
    two cyclocomputers
    two riders

    pick a distance, start at the same time, whoever "gets" there first wins= cheapo version
    Ode to the after work nap ( ride your bike instead)

    Ode to the nap
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    Shortly I will rise
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    Do not succumb
    To the evil, evil nap

  12. #12
    Rolling the Hard 6 jedi_steve420's Avatar
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    I've always been curious... does the accuracy of a cyclocomputer depend on where you place the magnet on the wheel. Just thinking about it in my head if you put the magnet in different spots wouldn't it give different readings as to speed and distance covered? Hope that's not too off topic... mabye i'll go and post in the road section... so cold though, so very cold and dark... I can't leave ssfg forum... but... I... must!
    "I love deadlines... I love the whoosing noise they make as they go by."
    - Douglas Adams -

  13. #13
    cab horn
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    Um no. The speed of the magnet is different depending on where you place it as it goes across the sensor.

    Think about it this way. Put two magnets on the same spoke. It's impossible for one to take longer than the other to do one full rotation.

    Sheldon brown's webpage says that the farther you put it from the hub the more of a chance for the cyclocomputer to not register the magnet going across the sensor at very high speeds. That would be the only reason not to mount it that far out.

  14. #14
    Dismount Run Remount etc. 12XU's Avatar
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    You live in PGH? Who are these friends of yours who hypothetically want to do this? I was pretty big with the bike kids in PGH this summer and don't recognize your name, but may recognize the names of your friends...

  15. #15
    Wake Up America! helvetica's Avatar
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    i saw some rollers on CL for free. i think, either way, they were on CL.
    ibsomeonesayssomethingabootbillhicks

  16. #16
    Senior Member Terror_in_pink's Avatar
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    also, you must throw up when you get off the bike.
    Ode to the after work nap ( ride your bike instead)

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    It lures
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    But only with good intent
    Shortly I will rise
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    Do not succumb
    To the evil, evil nap

  17. #17
    Wake Up America! helvetica's Avatar
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    Quote Originally Posted by Terror_in_pink
    also, you must throw up when you get off the bike.
    This happened to me once when I put my bike on a treadmill, it also was one of the hottest days during the summer.
    ibsomeonesayssomethingabootbillhicks

  18. #18
    jack of one or two trades Aeroplane's Avatar
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    From an electrical engineer's perspective: An easy way to do it would be with the same technology that makes tachometers work. A friend of mine had to build one for a project in school, so it can't be that hard (he was only a sophomore at the time). Have two identical rollers set up with tachs on each rear roller. Hook 'em up to a laptop or you could even do it on a PIC microcontroller if you can deal with a 2-line digital output. It's not that complicated of an idea, very doable. It'll probably just take time, patience, and some soldering.
    Quote Originally Posted by Dr Irwin Goldstein
    Men should never ride bicycles. Riding should be banned and outlawed. It is
    the most irrational form of exercise I could ever bring to discussion.

  19. #19
    roll'em high shants's Avatar
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    i used to be nerdy and wanted to do things the /best/ way. i liked to utilize technology and design interesting solutions, or whatever. then i realized that i could do it, as they say, "ghetto style," and have more money to buy beer and then more time to drink it. this is all to say -- two cylometers and some ****** to watch them. film if necessary.

  20. #20
    aka mattio queerpunk's Avatar
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    why not just two riders, two bikes, and a stretch of street?

    i'm sorry. "don't do what you're looking for more information on" is not a very good reply.

    i just don't understand the allure of goldsprints. which is not to say that there isn't any, or that nobody should find them fun.

    nevemind.
    the hipster myth.

    i practice vagabondery.

  21. #21
    Senior Member
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    Quote Originally Posted by queerpunk
    why not just two riders, two bikes, and a stretch of street?
    Without going into it, for all the reasons people train indoors.

    I understand that someone here will feel the need to pipe up about how harder core they are than me for not riding indoors, so let me cut you off at the pass and let you know that you are right. You are harder core than me, and your silence from here on out only reinforces your superiority.

    12XU: I'm Brad. Don't know if we know each other or not... I've lived here my entire life and have no idea of my status in the bike scene.

    Aeroplane: Back on topic here... Yeah, the PIC microcontrollers were cool to play with, and relatively easy to use. I'm thinking about dropping a line to one of my old engineering professors for a hand with this one. I went for mechanical engineering, and only had a class or two in microcontroller use/programming and am a bit rusty after a couple of years out. A very easy project, for sure...

    -brad

  22. #22
    aka mattio queerpunk's Avatar
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    Quote Originally Posted by Devolution
    Without going into it, for all the reasons people train indoors.

    I understand that someone here will feel the need to pipe up about how harder core they are than me for not riding indoors, so let me cut you off at the pass and let you know that you are right. You are harder core than me, and your silence from here on out only reinforces your superiority.
    sigh.
    down with your dukes, devo, that wasn't my intention. i generally try pretty hard to avoid that sort of one-upmanship. the intention of my post was not to tell you what to do.
    the hipster myth.

    i practice vagabondery.

  23. #23
    jack of one or two trades Aeroplane's Avatar
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    Quote Originally Posted by Devolution
    Aeroplane: Back on topic here... Yeah, the PIC microcontrollers were cool to play with, and relatively easy to use. I'm thinking about dropping a line to one of my old engineering professors for a hand with this one. I went for mechanical engineering, and only had a class or two in microcontroller use/programming and am a bit rusty after a couple of years out. A very easy project, for sure...
    Thinking about it a little more... If you are really slick, you could have the PIC output to a stepper motor, that would rotate your dial or picture of a guy on a bike.

    Very easy project, not likely. Doable without spending $$$$, very. In my experience, projects like this tend to involve a lot of beating your head up against a wall unless you know exactly what you're doing. Kind of like building a bike the first time.
    Quote Originally Posted by Dr Irwin Goldstein
    Men should never ride bicycles. Riding should be banned and outlawed. It is
    the most irrational form of exercise I could ever bring to discussion.

  24. #24
    Dismount Run Remount etc. 12XU's Avatar
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    Hell, I wouldn't ride outside in the winter nearly as often if I 1) didn't have a beater bike or 2) didn't have some nice Kreitler rollers (Which still haven't come in yet).

  25. #25
    Team Beer Cynikal's Avatar
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    Triplets of Bellville anyone?
    I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC

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