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Thread: Comparison of Dual-Tube vs Mono-Tube Frame Deflection

  1. #1
    Senior Member sowseng's Avatar
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    Comparison of Dual-Tube vs Mono-Tube Frame Deflection

    Watched this video, quite interesting.

    http://www.youtube.com/watch?v=BgtcAI08v3Y

    Notice the color, also quite interesting.

    Attachment 49375
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  2. #2
    But the Aero T's frame isn't deflecting. The Aero Z's footrest is displaced backwards.


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    i have the tilite ttc. it's a twin tube design and i have noticed how much better it feels vs monotube. over 10yrs old and still going!
    "Smells like death in a bucket of chicken!"
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  4. #4
    Thanks for the video, it's great.

    I don't interpret the colors same as you do, maybe some mechanical engineer could help but it seems to me that the color scale represents the force applied to the frame: red is the highest where the bump force is applied and blue is the lowest.

    The Aero T design distributes more the forces than the Aero Z which is a great thing as it avoids stressing and flexing one part in particular.

  5. #5
    You might interpret the Z's flex as a shock absorber. The T hits with the same impact.
    I have had periodic paralysis all my life. I lost my ability to walk in 2011 beginning with a spinal block, which was used for a hip fracture caused by periodic paralysis.

  6. #6
    Senior Member brian's Avatar
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    You're interpreting the colors incorrectly. The AeroZ frame is built to flex and therefore the force of the impact is isolated closer to a single point. The AeroT frame is a box-frame design where the flex is more evenly distributed throughout the chair and therefore force will be spread out over more of the frame. Thats why there are warm colors spread out over more of the AeroT frame.

    The important thing to take away from the video is that the AeroT frame flexes less under impact and is, therefore, a more rigid frame.
    Last edited by brian; 04-12-2013 at 09:55 AM.

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    So from my point of view, sitting in one chair or the other as it hits that obstacle, what is the difference? Is the dual-tube better able to keep rolling over and past that obstruction? Am I getting more of a physical shock if the chair flexes less? I'm not understanding what the point of this video is, if it's meant to be anything beyond "Aero-T frame is stronger than Aero-Z frame", which I wouldn't have thought was controversial enough to warrant a video? Is it a durability issue?

  8. #8
    Senior Member sowseng's Avatar
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    I think not many daily user will get those 100 lb impact.

    Deflection might cause frame fatigue, but for daily open frame chair, who is really going to knock themselves that hard? 100lb? It might throw ourselves out from the chair.

    Further more wheelie will help to avoid some obstacles.
    Life is meaningles, though you create the purpose.

  9. #9
    Senior Member brian's Avatar
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    You're right, but there are people who will. I'm sure I do. Not often, but enough to matter.

    If I'm trying to get up a big curb and I charge at it and don't get the front end up high enough that's a pretty heavy collision. When I'm using my ski poles in the streets I'm traveling pretty fast and have been known to hit a pothole. Or when Axle gets pulled by his dog at 30mph anything he hits will result in an impact with enough force to block out the sun.

    100lbs is an extreme test. No, it doesn't happen every day, but when it does It'd be glad to know my frame is built to take it.

  10. #10
    Senior Member sowseng's Avatar
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    Quote Originally Posted by brian View Post
    You're right, but there are people who will. I'm sure I do. Not often, but enough to matter.

    If I'm trying to get up a big curb and I charge at it and don't get the front end up high enough that's a pretty heavy collision. When I'm using my ski poles in the streets I'm traveling pretty fast and have been known to hit a pothole. Or when Axle gets pulled by his dog at 30mph anything he hits will result in an impact with enough force to block out the sun.

    100lbs is an extreme test. No, it doesn't happen every day, but when it does It'd be glad to know my frame is built to take it.
    Yes, always looks for beyond safe level.
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