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Originally Posted by Michael4yah
The overall savings on the Forged Crank using a rotating weight ratio is worth about 100lbs in itself, 17lb difference X 6= 102 lbs. The way thats calculated is that it costs 6X more to turn that Forged crank than it does to carry the weight of it. I know, it sounds like the new math all over again.
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I'm not sure I understand that. Alloy steel and cast iron have similar densities, and cranks add next to nothing to rotational inertia.
What did you mean?