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  1. #176
    pyf
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    Quote Originally Posted by Lombard View Post
    Interesting about flange spacing. But I'm thinking more spokes will make more of a difference in stiffness than whether my flange spacing is 37/18 or 36/17. And of course, the flange diameters would also play a role. Some hubs have larger diameter DS flanges, some don't.
    The more you cross the spokes (so the more "tangential" they get to hub flange drillings diameter) the less a larger flange is going to make a difference --> to increase spokes angles, geometry must make the spokes shorter... and try it yourself in spoc calc or solidworks or whatever you use to calculate spokes lenghts you'll see a larger flange definitely make spoke shorter and as a consequence increase angle if you do radial but the more you cross the less it matters... so unless you do radial or 1x on drive side it's not the solution you are looking for ! So Ergott is right center to flange distance is much more important.

  2. #177
    Boyd Cycling owner
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    Quote Originally Posted by pyf View Post
    The more you cross the spokes (so the more "tangential" they get to hub flange drillings diameter) the less a larger flange is going to make a difference --> to increase spokes angles, geometry must make the spokes shorter... and try it yourself in spoc calc or solidworks or whatever you use to calculate spokes lenghts you'll see a larger flange definitely make spoke shorter and as a consequence increase angle if you do radial but the more you cross the less it matters... so unless you do radial or 1x on drive side it's not the solution you are looking for ! So Ergott is right center to flange distance is much more important.
    Also, the thing you have to consider is the distance from center where you are calculating the angle. For example, if the flange was directly under the rim, the angle of the spoke wouldn't change whether the flange height was 1mm or 150mm. It would still be zero degrees.

    The further out you move the flange, the more changes to the flange height affect the bracing angle of the spokes.

    Because the drive side flange is very limited in how far it can be moved out (because of the cassette), the changes in flange diameter have an extremely small affect on the angle of the spokes. Changing flange height from 50mm to 100mm is about the same as moving the flange outward by about 0.3mm in terms of the bracing angle.
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  3. #178
    pyf
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    Quote Originally Posted by coachboyd View Post
    Because the drive side flange is very limited in how far it can be moved out (because of the cassette), the changes in flange diameter have an extremely small affect on the angle of the spokes. Changing flange height from 50mm to 100mm is about the same as moving the flange outward by about 0.3mm in terms of the bracing angle.
    Completely agree.
    Unless you use the opportunity to reduce de crossing pattern thanks to the larger flange (like going from 3x to 2x on the drive side of a 28 spokes rear wheel), there is no reason to go to a flange larger than what is necessary to welcome the drive mechanism underneath !

  4. #179
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    Interesting points Coach Boyd and PYF. Thank you for clarifying this!
    “Statistics are like bikinis. What they reveal is suggestive, but what they conceal is vital.” -- Aaron Levenstein

    "Beware of geeks bearing formulas."
    -- Warren Buffett

    "Education is what you get when you read the fine print. Experience is what you get when you don't. -- Pete Seeger



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