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Originally Posted by insite
How many g's do you think are exerted outward by centripetal force at the edge of a flywheel turning 7300 rpm? 100? 1000?
Try ELEVEN THOUSAND THREE HUNDRED. 11,300g at my redline. That means 17grams becomes 425 lb. Over time, that wobble can absolutely fatigue the crank. It's not forged, it's sintered.
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My point is that the crank won't fatigue because the force (your calculation of 425 lbs) is far below the fatigue load. This situation isn't like bending a paper clip back and forth until it breaks. This load level is more like me trying to bend a street light post. No matter how long I push on it (months, years, decades), it ain't never gonna break.
This is why owners can drive around with a failing DMFW for thousands of miles (which produces 100x the force of your example LWFW) and everything is still ok.