Quote:
Originally Posted by beowulf80
^^^
Good start here. However, mass is based on volume, not surface area. So to properly compare them, we'd have to know how thick the metal is on both wheels.
For forge vs. cast: Forged is typically stronger than cast, but spoke design should play a role here too. For two identically shaped parts, with the same thicknesses; the process which made them should have almost no effect on the final mass, unless the forge comression significantly altered the steel's density. What you can do by forging a part is generally make it thinner. How much depends on the geometry and who engineered it.
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I understand it's based on volume, not surface area, but short of dropping both wheels in a tub of water and measuring the amount of water displaced, I figured that would be a simple example of how the 20" wheel's circumference leads to more mass by showing that the area is greater, which, in theory, would mean the volume is also greater. Nice catch though!
