Frame flex- your perceptions?- Mtbr.com
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  1. #1
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    Meh.
    Last edited by scottzg; 04-21-2017 at 10:31 PM.
    "Things that are complex are not useful, Things that are useful are simple."
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  2. #2
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    Unless you are systematically varying just the frame tube diameter (or whatever you want to test) there is no way to use this mass of subjective opinion for anything.

    Every 10% bigger you make the tube roughly doubles it's stiffness (the tube, not the frame). 38mm DT is generally stiff enough for even pretty big riders, but if you like it even stiffer, bump up to 42 or 44.5. Beyond that there's no point unless you're doing something super unusual.

    -Walt

  3. #3
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    Quote Originally Posted by Walt View Post
    Unless you are systematically varying just the frame tube diameter (or whatever you want to test) there is no way to use this mass of subjective opinion for anything.

    Every 10% bigger you make the tube roughly doubles it's stiffness (the tube, not the frame). 38mm DT is generally stiff enough for even pretty big riders, but if you like it even stiffer, bump up to 42 or 44.5. Beyond that there's no point unless you're doing something super unusual.

    -Walt

    There's value in hearing what other people perceive even if there's no hard data attached, especially if you build for other people.
    Last edited by scottzg; 04-21-2017 at 10:31 PM.
    "Things that are complex are not useful, Things that are useful are simple."
    Mikhail Kalashnikov

  4. #4
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    Bluntly, your bikes and perceptions are all over the map. Could something be gleaned (by you)? Sure. Is your OP a good start to a useful conversation? Not really, especially because different people of the same size/riding style can *like* different amounts of frame flex.

    Comparing different styles/brands/models/sizes of bike, built with different components, using different suspension designs (or none), etc... not the way to start. If you really want to investigate what works *for you* get a set of parts you'll use on each frame, and then build some frames using varying tubing, or configuration but not geometry (ie long fork/short head tube vs short fork/long headtube to get the same stack). Of course, then you'll also need to spend a bunch of time on both setups to really get used them both before you can decide what's preferable.

    -Walt

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