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I've been building this

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I've been building this

Old 04-10-14, 03:28 PM
  #1  
sjofels
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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!

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Old 04-10-14, 06:08 PM
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unterhausen
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that's pretty neat, thanks for sharing
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Old 04-11-14, 09:07 AM
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Stealth bike!
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Old 04-14-14, 10:56 AM
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Very cool, thanks for sharing.
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Old 05-27-14, 02:42 AM
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An update:
my bike ? coaster brake added
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Old 06-10-14, 05:09 PM
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Interesting, flat black it and call it the Blackbird or B1. Stealth bomber bike fkr sure.
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Old 06-20-14, 09:45 AM
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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.
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Old 06-20-14, 10:30 AM
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Why no down tube or seat stays?
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Old 06-21-14, 08:33 PM
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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.
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Old 06-23-14, 05:10 AM
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Originally Posted by Homebrew01 View Post
My thought too.

Triangulation has its merits.
In frame design more than tubing.
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Old 06-30-14, 08:06 AM
  #11  
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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.
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Old 06-30-14, 08:24 AM
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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.
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Old 06-30-14, 10:23 PM
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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
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Old 07-01-14, 06:21 AM
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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
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Old 07-02-14, 01:46 PM
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Agreed. That looks like ~50 mm tubing, with likely heavy walls.
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