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  1. #1
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    I've been building this

    I know it's not very conventional and not straight exactly, but is more a proof of concept/mock-up then a real piece of bicycle perfection, I cannibalized an old cheap frame and slapped it together with tubes laying around. It does not have brakes as of yet, but it rides quite smoothly.
    Oh, and I,m new here!
    Greetings from the Netherlands!

    fietsie01.jpgfietsie02.jpgfietsie03.jpg

  2. #2
    Randomhead
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    that's pretty neat, thanks for sharing
    Randonneuring -- it's touring for people that aren't smart enough to stop for the night.
    It's a wonderful sport when you can make up for a lack of ability with a lack of sleep

  3. #3
    Team Beer Cynikal's Avatar
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    Stealth bike!
    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

  4. #4
    tuz
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    Very cool, thanks for sharing.
    homebuilt commuter, mixte, road and track (+ Ryffranck road)
    bla bla blog

  5. #5
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  6. #6
    Senior Member BIGDCYCLES's Avatar
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    Interesting, flat black it and call it the Blackbird or B1. Stealth bomber bike fkr sure.

  7. #7
    Senior Member SJX426's Avatar
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    From an engineering perspective, it looks like an accident waiting to happen with the first significant bump, nothing stealth about the impending road rash. Sorry.

  8. #8
    Old fart JohnDThompson's Avatar
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    Why no down tube or seat stays?

  9. #9
    Senior Member Homebrew01's Avatar
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    Quote Originally Posted by SJX426 View Post
    From an engineering perspective, it looks like an accident waiting to happen with the first significant bump, nothing stealth about the impending road rash. Sorry.
    My thought too.

    Triangulation has its merits.
    Bikes: Old steel race bikes, old Cannondale race bikes, less old Cannondale race bike, crappy old mtn bike

  10. #10
    Senior Member SJX426's Avatar
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    Quote Originally Posted by Homebrew01 View Post
    My thought too.

    Triangulation has its merits.
    In frame design more than tubing.

  11. #11
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    Quote Originally Posted by SJX426 View Post
    In frame design more than tubing.
    well after a few ( careful) testrides it still holds, most old fashioned folding and recumben tbikes have one tube by the way. so, gonna try (and maybe fail, but there is no shame in failure) it anyway.

  12. #12
    Senior Member SJX426's Avatar
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    Maybe no shame, but significant pain. I would wish you luck but its all about physics and material properites and no luck.

  13. #13
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    Quote Originally Posted by sjofels View Post
    well after a few ( careful) testrides it still holds, most old fashioned folding and recumben tbikes have one tube by the way. so, gonna try (and maybe fail, but there is no shame in failure) it anyway.
    sjofels; Noting your example of bikes with single main tube are bikes that have that tube used in a completely opposite part of the frame design. If you were to remove the top tube from your design and replace it with a down tube, then your revised design would be closer to the examples you cite and would be at least marginally viable. Of course putting in both tubes will dramatically improve the strength...

    /K

  14. #14
    Randomhead
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    triangulation is only important if you are going for light weight. Given the OP's location, weight probably isn't as much of an issue for him. And it looks to be plenty sturdy enough

  15. #15
    tuz
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    Agreed. That looks like ~50 mm tubing, with likely heavy walls.
    homebuilt commuter, mixte, road and track (+ Ryffranck road)
    bla bla blog

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