[quote=goodsailing][quote]Check this site out, pretty cool tool to compare the stiffness of different tubes.
http://metalgeek.com/static/deflection.php[/quote]
At second glance, this is for square tubing, which may not be as strong as round tube.
I found this one. It might be good to calculate stress along an 8' span of 4130 for axle.
[url]https://www.roguefab.com/calculator.php[/url][/quote]
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